Programs & Examples On #Os.execl

Launch a shell command with in a python script, wait for the termination and return to the script

You can use subprocess.Popen. There's a few ways to do it:

import subprocess
cmd = ['/run/myscript', '--arg', 'value']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
for line in p.stdout:
    print line
p.wait()
print p.returncode

Or, if you don't care what the external program actually does:

cmd = ['/run/myscript', '--arg', 'value']
subprocess.Popen(cmd).wait()

How to document Python code using Doxygen

Sphinx is mainly a tool for formatting docs written independently from the source code, as I understand it.

For generating API docs from Python docstrings, the leading tools are pdoc and pydoctor. Here's pydoctor's generated API docs for Twisted and Bazaar.

Of course, if you just want to have a look at the docstrings while you're working on stuff, there's the "pydoc" command line tool and as well as the help() function available in the interactive interpreter.

How to generate XML from an Excel VBA macro?

This one more version - this will help in generic

Public strSubTag As String
Public iStartCol As Integer
Public iEndCol As Integer
Public strSubTag2 As String
Public iStartCol2 As Integer
Public iEndCol2 As Integer

Sub Create()
Dim strFilePath As String
Dim strFileName As String

'ThisWorkbook.Sheets("Sheet1").Range("C3").Activate
'strTag = ActiveCell.Offset(0, 1).Value
strFilePath = ThisWorkbook.Sheets("Sheet1").Range("B4").Value
strFileName = ThisWorkbook.Sheets("Sheet1").Range("B5").Value
strSubTag = ThisWorkbook.Sheets("Sheet1").Range("F3").Value
iStartCol = ThisWorkbook.Sheets("Sheet1").Range("F4").Value
iEndCol = ThisWorkbook.Sheets("Sheet1").Range("F5").Value

strSubTag2 = ThisWorkbook.Sheets("Sheet1").Range("G3").Value
iStartCol2 = ThisWorkbook.Sheets("Sheet1").Range("G4").Value
iEndCol2 = ThisWorkbook.Sheets("Sheet1").Range("G5").Value

Dim iCaptionRow As Integer
iCaptionRow = ThisWorkbook.Sheets("Sheet1").Range("B3").Value
'strFileName = ThisWorkbook.Sheets("Sheet1").Range("B4").Value
MakeXML iCaptionRow, iCaptionRow + 1, strFilePath, strFileName

End Sub


Sub MakeXML(iCaptionRow As Integer, iDataStartRow As Integer, sOutputFilePath As String, sOutputFileName As String)
    Dim Q As String
    Dim sOutputFileNamewithPath As String
    Q = Chr$(34)

    Dim sXML As String


    'sXML = sXML & "<rows>"

'    ''--determine count of columns
    Dim iColCount As Integer
    iColCount = 1

    While Trim$(Cells(iCaptionRow, iColCount)) > ""
        iColCount = iColCount + 1
    Wend


    Dim iRow As Integer
    Dim iCount  As Integer
    iRow = iDataStartRow
    iCount = 1
    While Cells(iRow, 1) > ""
        'sXML = sXML & "<row id=" & Q & iRow & Q & ">"
        sXML = "<?xml version=" & Q & "1.0" & Q & " encoding=" & Q & "UTF-8" & Q & "?>"
        For iCOl = 1 To iColCount - 1
          If (iStartCol = iCOl) Then
               sXML = sXML & "<" & strSubTag & ">"
          End If
          If (iEndCol = iCOl) Then
               sXML = sXML & "</" & strSubTag & ">"
          End If
         If (iStartCol2 = iCOl) Then
               sXML = sXML & "<" & strSubTag2 & ">"
          End If
          If (iEndCol2 = iCOl) Then
               sXML = sXML & "</" & strSubTag2 & ">"
          End If
           sXML = sXML & "<" & Trim$(Cells(iCaptionRow, iCOl)) & ">"
           sXML = sXML & Trim$(Cells(iRow, iCOl))
           sXML = sXML & "</" & Trim$(Cells(iCaptionRow, iCOl)) & ">"
        Next

        'sXML = sXML & "</row>"
        Dim nDestFile As Integer, sText As String

    ''Close any open text files
        Close

    ''Get the number of the next free text file
        nDestFile = FreeFile
        sOutputFileNamewithPath = sOutputFilePath & sOutputFileName & iCount & ".XML"
    ''Write the entire file to sText
        Open sOutputFileNamewithPath For Output As #nDestFile
        Print #nDestFile, sXML

        iRow = iRow + 1
        sXML = ""
        iCount = iCount + 1
    Wend
    'sXML = sXML & "</rows>"

    Close
End Sub

Can I disable a CSS :hover effect via JavaScript?

Try just setting the link color:

$("ul#mainFilter a").css('color','#000');

Edit: or better yet, use the CSS, as Christopher suggested

Make element fixed on scroll

window.addEventListener("scroll", function(evt) {
    var pos_top = document.body.scrollTop;   
    if(pos_top == 0){
       $('#divID').css('position','fixed');
    }

    else if(pos_top > 0){
       $('#divId').css('position','static');
    }
});

Convert Mongoose docs to json

You may also try mongoosejs's lean() :

UserModel.find().lean().exec(function (err, users) {
    return res.end(JSON.stringify(users));
}

How to reload current page?

With angular 11 you can just use this:

in route config add runGuardsAndResolvers: 'always'

const routes: Routes = [
  { path: '', component: Component, runGuardsAndResolvers: 'always' },
];

and this is your method to reload:

  reloadView(): void {
    this.router.navigated = false;
    this.router.navigate(['./'], { relativeTo: this.route });
  }

this will trigger any resolver on that config

How to hide Table Row Overflow?

wrap the table in a div with class="container"

div.container {
    width: 100%;
    overflow-x: auto;
}

then

#table_id tr td {
   white-space:nowrap;
}

result

overflow effect

Convert YYYYMMDD string date to a datetime value

You should have to use DateTime.TryParseExact.

var newDate = DateTime.ParseExact("20111120", 
                                  "yyyyMMdd", 
                                   CultureInfo.InvariantCulture);

OR

string str = "20111021";
string[] format = {"yyyyMMdd"};
DateTime date;

if (DateTime.TryParseExact(str, 
                           format, 
                           System.Globalization.CultureInfo.InvariantCulture,
                           System.Globalization.DateTimeStyles.None, 
                           out date))
{
     //valid
}

How to read from input until newline is found using scanf()?

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

int main(void)
{
  int i = 0;
  char *a = (char *) malloc(sizeof(char) * 1024);
  while (1) {
    scanf("%c", &a[i]);
    if (a[i] == '\n') {
      break;
    }
    else {
      i++;
    }
  }
  a[i] = '\0';
  i = 0;
  printf("\n");
  while (a[i] != '\0') {
    printf("%c", a[i]);
    i++;
  }
  free(a);
  getch();
  return 0;
}

What IDE to use for Python?

Results

Spreadsheet version

spreadsheet screenshot

Alternatively, in plain text: (also available as a a screenshot)

                         Bracket Matching -.  .- Line Numbering
                          Smart Indent -.  |  |  .- UML Editing / Viewing
         Source Control Integration -.  |  |  |  |  .- Code Folding
                    Error Markup -.  |  |  |  |  |  |  .- Code Templates
  Integrated Python Debugging -.  |  |  |  |  |  |  |  |  .- Unit Testing
    Multi-Language Support -.  |  |  |  |  |  |  |  |  |  |  .- GUI Designer (Qt, Eric, etc)
   Auto Code Completion -.  |  |  |  |  |  |  |  |  |  |  |  |  .- Integrated DB Support
     Commercial/Free -.  |  |  |  |  |  |  |  |  |  |  |  |  |  |  .- Refactoring
   Cross Platform -.  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     
                  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Atom              |Y |F |Y |Y*|Y |Y |Y |Y |Y |Y |  |Y |Y |  |  |  |  |*many plugins
Editra            |Y |F |Y |Y |  |  |Y |Y |Y |Y |  |Y |  |  |  |  |  |
Emacs             |Y |F |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |  |  |  |
Eric Ide          |Y |F |Y |  |Y |Y |  |Y |  |Y |  |Y |  |Y |  |  |  |
Geany             |Y |F |Y*|Y |  |  |  |Y |Y |Y |  |Y |  |  |  |  |  |*very limited
Gedit             |Y |F |Y¹|Y |  |  |  |Y |Y |Y |  |  |Y²|  |  |  |  |¹with plugin; ²sort of
Idle              |Y |F |Y |  |Y |  |  |Y |Y |  |  |  |  |  |  |  |  |
IntelliJ          |Y |CF|Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |
JEdit             |Y |F |  |Y |  |  |  |  |Y |Y |  |Y |  |  |  |  |  |
KDevelop          |Y |F |Y*|Y |  |  |Y |Y |Y |Y |  |Y |  |  |  |  |  |*no type inference
Komodo            |Y |CF|Y |Y |Y |Y |Y |Y |Y |Y |  |Y |Y |Y |  |Y |  |
NetBeans*         |Y |F |Y |Y |Y |  |Y |Y |Y |Y |Y |Y |Y |Y |  |  |Y |*pre-v7.0
Notepad++         |W |F |Y |Y |  |Y*|Y*|Y*|Y |Y |  |Y |Y*|  |  |  |  |*with plugin
Pfaide            |W |C |Y |Y |  |  |  |Y |Y |Y |  |Y |Y |  |  |  |  |
PIDA              |LW|F |Y |Y |  |  |  |Y |Y |Y |  |Y |  |  |  |  |  |VIM based
PTVS              |W |F |Y |Y |Y |Y |Y |Y |Y |Y |  |Y |  |  |Y*|  |Y |*WPF bsed
PyCharm           |Y |CF|Y |Y*|Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |*JavaScript
PyDev (Eclipse)   |Y |F |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |Y |  |  |  |
PyScripter        |W |F |Y |  |Y |Y |  |Y |Y |Y |  |Y |Y |Y |  |  |  |
PythonWin         |W |F |Y |  |Y |  |  |Y |Y |  |  |Y |  |  |  |  |  |
SciTE             |Y |F¹|  |Y |  |Y |  |Y |Y |Y |  |Y |Y |  |  |  |  |¹Mac version is
ScriptDev         |W |C |Y |Y |Y |Y |  |Y |Y |Y |  |Y |Y |  |  |  |  |    commercial
Spyder            |Y |F |Y |  |Y |Y |  |Y |Y |Y |  |  |  |  |  |  |  |
Sublime Text      |Y |CF|Y |Y |  |Y |Y |Y |Y |Y |  |Y |Y |Y*|  |  |  |extensible w/Python,
TextMate          |M |F |  |Y |  |  |Y |Y |Y |Y |  |Y |Y |  |  |  |  |    *PythonTestRunner
UliPad            |Y |F |Y |Y |Y |  |  |Y |Y |  |  |  |Y |Y |  |  |  |
Vim               |Y |F |Y |Y |Y |Y |Y |Y |Y |Y |  |Y |Y |Y |  |  |  |
Visual Studio     |W |CF|Y |Y |Y |Y |Y |Y |Y |Y |? |Y |? |? |Y |? |Y |
Visual Studio Code|Y |F |Y |Y |Y |Y |Y |Y |Y |Y |? |Y |? |? |? |? |Y |uses plugins
WingIde           |Y |C |Y |Y*|Y |Y |Y |Y |Y |Y |  |Y |Y |Y |  |  |  |*support for C
Zeus              |W |C |  |  |  |  |Y |Y |Y |Y |  |Y |Y |  |  |  |  |
                  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
   Cross Platform -'  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     
     Commercial/Free -'  |  |  |  |  |  |  |  |  |  |  |  |  |  |  '- Refactoring
   Auto Code Completion -'  |  |  |  |  |  |  |  |  |  |  |  |  '- Integrated DB Support
    Multi-Language Support -'  |  |  |  |  |  |  |  |  |  |  '- GUI Designer (Qt, Eric, etc)
  Integrated Python Debugging -'  |  |  |  |  |  |  |  |  '- Unit Testing
                    Error Markup -'  |  |  |  |  |  |  '- Code Templates
         Source Control Integration -'  |  |  |  |  '- Code Folding
                          Smart Indent -'  |  |  '- UML Editing / Viewing
                         Bracket Matching -'  '- Line Numbering

Acronyms used:

 L  - Linux
 W  - Windows
 M  - Mac
 C  - Commercial
 F  - Free
 CF - Commercial with Free limited edition
 ?  - To be confirmed

I don't mention basics like syntax highlighting as I expect these by default.


This is a just dry list reflecting your feedback and comments, I am not advocating any of these tools. I will keep updating this list as you keep posting your answers.

PS. Can you help me to add features of the above editors to the list (like auto-complete, debugging, etc.)?

We have a comprehensive wiki page for this question https://wiki.python.org/moin/IntegratedDevelopmentEnvironments

Submit edits to the spreadsheet

Configuration System Failed to Initialize

This is kinda dumb, but for me I fixed it by doing a get latest from source control on my code. I think there was some new configuration element that was added by someone else, and I needed to overwrite my configuration files. OP shows the error I had gotten, which wasn't really pointing me in the right direction.

Get file name from URI string in C#

You can just make a System.Uri object, and use IsFile to verify it's a file, then Uri.LocalPath to extract the filename.

This is much safer, as it provides you a means to check the validity of the URI as well.


Edit in response to comment:

To get just the full filename, I'd use:

Uri uri = new Uri(hreflink);
if (uri.IsFile) {
    string filename = System.IO.Path.GetFileName(uri.LocalPath);
}

This does all of the error checking for you, and is platform-neutral. All of the special cases get handled for you quickly and easily.

How do I remove a MySQL database?

If you are working in XAMPP and your query of drop database doesn't work then you can go to the operations tag where you find the column (drop the database(drop)), click that button and your database will be deleted.

LINQ Inner-Join vs Left-Join

Left joins in LINQ are possible with the DefaultIfEmpty() method. I don't have the exact syntax for your case though...

Actually I think if you just change pets to pets.DefaultIfEmpty() in the query it might work...

EDIT: I really shouldn't answer things when its late...

Xcode Project vs. Xcode Workspace - Differences

A workspace is a collection of projects. It's useful to organize your projects when there's correlation between them (e.g.: Project A includes a library, that is provided as a project itself as project B. When you build the workspace project B is compiled and linked in project A).
It's common to use a workspace in the popular CocoaPods. When you install your pods, they are placed inside a workspace, that holds your project and the pod libraries.

print memory address of Python variable

id is the method you want to use: to convert it to hex:

hex(id(variable_here))

For instance:

x = 4
print hex(id(x))

Gave me:

0x9cf10c

Which is what you want, right?

(Fun fact, binding two variables to the same int may result in the same memory address being used.)
Try:

x = 4
y = 4
w = 9999
v = 9999
a = 12345678
b = 12345678
print hex(id(x))
print hex(id(y))
print hex(id(w))
print hex(id(v))
print hex(id(a))
print hex(id(b))

This gave me identical pairs, even for the large integers.

How do I change the string representation of a Python class?

This is not as easy as it seems, some core library functions don't work when only str is overwritten (checked with Python 2.7), see this thread for examples How to make a class JSON serializable Also, try this

import json

class A(unicode):
    def __str__(self):
        return 'a'
    def __unicode__(self):
        return u'a'
    def __repr__(self):
        return 'a'

a = A()
json.dumps(a)

produces

'""'

and not

'"a"'

as would be expected.

EDIT: answering mchicago's comment:

unicode does not have any attributes -- it is an immutable string, the value of which is hidden and not available from high-level Python code. The json module uses re for generating the string representation which seems to have access to this internal attribute. Here's a simple example to justify this:

b = A('b') print b

produces

'a'

while

json.dumps({'b': b})

produces

{"b": "b"}

so you see that the internal representation is used by some native libraries, probably for performance reasons.

See also this for more details: http://www.laurentluce.com/posts/python-string-objects-implementation/

How to reverse MD5 to get the original string?

No, that's not really possible, as

  • there can be more than one string giving the same MD5
  • it was designed to be hard to "reverse"

The goal of the MD5 and its family of hashing functions is

  • to get short "extracts" from long string
  • to make it hard to guess where they come from
  • to make it hard to find collisions, that is other words having the same hash (which is a very similar exigence as the second one)

Think that you can get the MD5 of any string, even very long. And the MD5 is only 16 bytes long (32 if you write it in hexa to store or distribute it more easily). If you could reverse them, you'd have a magical compacting scheme.

This being said, as there aren't so many short strings (passwords...) used in the world, you can test them from a dictionary (that's called "brute force attack") or even google for your MD5. If the word is common and wasn't salted, you have a reasonable chance to succeed...

Centering in CSS Grid

This answer has two main sections:

  1. Understanding how alignment works in CSS Grid.
  2. Six methods for centering in CSS Grid.

If you're only interested in the solutions, skip the first section.


The Structure and Scope of Grid layout

To fully understand how centering works in a grid container, it's important to first understand the structure and scope of grid layout.

The HTML structure of a grid container has three levels:

  • the container
  • the item
  • the content

Each of these levels is independent from the others, in terms of applying grid properties.

The scope of a grid container is limited to a parent-child relationship.

This means that a grid container is always the parent and a grid item is always the child. Grid properties work only within this relationship.

Descendants of a grid container beyond the children are not part of grid layout and will not accept grid properties. (At least not until the subgrid feature has been implemented, which will allow descendants of grid items to respect the lines of the primary container.)

Here's an example of the structure and scope concepts described above.

Imagine a tic-tac-toe-like grid.

article {
  display: inline-grid;
  grid-template-rows: 100px 100px 100px;
  grid-template-columns: 100px 100px 100px;
  grid-gap: 3px;
}

enter image description here

You want the X's and O's centered in each cell.

So you apply the centering at the container level:

article {
  display: inline-grid;
  grid-template-rows: 100px 100px 100px;
  grid-template-columns: 100px 100px 100px;
  grid-gap: 3px;
  justify-items: center;
}

But because of the structure and scope of grid layout, justify-items on the container centers the grid items, not the content (at least not directly).

enter image description here

_x000D_
_x000D_
article {_x000D_
  display: inline-grid;_x000D_
  grid-template-rows: 100px 100px 100px;_x000D_
  grid-template-columns: 100px 100px 100px;_x000D_
  grid-gap: 3px;_x000D_
  justify-items: center;_x000D_
}_x000D_
_x000D_
section {_x000D_
    border: 2px solid black;_x000D_
    font-size: 3em;_x000D_
}
_x000D_
<article>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
</article>
_x000D_
_x000D_
_x000D_

Same problem with align-items: The content may be centered as a by-product, but you've lost the layout design.

article {
  display: inline-grid;
  grid-template-rows: 100px 100px 100px;
  grid-template-columns: 100px 100px 100px;
  grid-gap: 3px;
  justify-items: center;
  align-items: center;
}

enter image description here

_x000D_
_x000D_
article {_x000D_
  display: inline-grid;_x000D_
  grid-template-rows: 100px 100px 100px;_x000D_
  grid-template-columns: 100px 100px 100px;_x000D_
  grid-gap: 3px;_x000D_
  justify-items: center;_x000D_
  align-items: center;_x000D_
}_x000D_
_x000D_
section {_x000D_
    border: 2px solid black;_x000D_
    font-size: 3em;_x000D_
}
_x000D_
<article>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
    <section>O</section>_x000D_
    <section>X</section>_x000D_
</article>
_x000D_
_x000D_
_x000D_

To center the content you need to take a different approach. Referring again to the structure and scope of grid layout, you need to treat the grid item as the parent and the content as the child.

article {
  display: inline-grid;
  grid-template-rows: 100px 100px 100px;
  grid-template-columns: 100px 100px 100px;
  grid-gap: 3px;
}

section {
  display: flex;
  justify-content: center;
  align-items: center;
  border: 2px solid black;
  font-size: 3em;
}

enter image description here

_x000D_
_x000D_
article {_x000D_
  display: inline-grid;_x000D_
  grid-template-rows: 100px 100px 100px;_x000D_
  grid-template-columns: 100px 100px 100px;_x000D_
  grid-gap: 3px;_x000D_
}_x000D_
_x000D_
section {_x000D_
  display: flex;_x000D_
  justify-content: center;_x000D_
  align-items: center;_x000D_
  border: 2px solid black;_x000D_
  font-size: 3em;_x000D_
}
_x000D_
<article>_x000D_
  <section>X</section>_x000D_
  <section>O</section>_x000D_
  <section>X</section>_x000D_
  <section>O</section>_x000D_
  <section>X</section>_x000D_
  <section>O</section>_x000D_
  <section>X</section>_x000D_
  <section>O</section>_x000D_
  <section>X</section>_x000D_
</article>
_x000D_
_x000D_
_x000D_

jsFiddle demo


Six Methods for Centering in CSS Grid

There are multiple methods for centering grid items and their content.

Here's a basic 2x2 grid:

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

Flexbox

For a simple and easy way to center the content of grid items use flexbox.

More specifically, make the grid item into a flex container.

There is no conflict, spec violation or other problem with this method. It's clean and valid.

grid-item {
  display: flex;
  align-items: center;
  justify-content: center;
}

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  display: flex;            /* new */_x000D_
  align-items: center;      /* new */_x000D_
  justify-content: center;  /* new */_x000D_
}_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

See this post for a complete explanation:


Grid Layout

In the same way that a flex item can also be a flex container, a grid item can also be a grid container. This solution is similar to the flexbox solution above, except centering is done with grid, not flex, properties.

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  display: grid;            /* new */_x000D_
  align-items: center;      /* new */_x000D_
  justify-items: center;    /* new */_x000D_
}_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_


auto margins

Use margin: auto to vertically and horizontally center grid items.

grid-item {
  margin: auto;
}

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  margin: auto;_x000D_
}_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

To center the content of grid items you need to make the item into a grid (or flex) container, wrap anonymous items in their own elements (since they cannot be directly targeted by CSS), and apply the margins to the new elements.

grid-item {
  display: flex;
}

span, img {
  margin: auto;
}

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  display: flex;_x000D_
}_x000D_
_x000D_
span, img {_x000D_
  margin: auto;_x000D_
}_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item><span>this text should be centered</span></grid-item>_x000D_
  <grid-item><span>this text should be centered</span></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_


Box Alignment Properties

When considering using the following properties to align grid items, read the section on auto margins above.

  • align-items
  • justify-items
  • align-self
  • justify-self

https://www.w3.org/TR/css-align-3/#property-index


text-align: center

To center content horizontally in a grid item, you can use the text-align property.

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
  text-align: center;  /* new */_x000D_
}_x000D_
_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

Note that for vertical centering, vertical-align: middle will not work.

This is because the vertical-align property applies only to inline and table-cell containers.

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
  text-align: center;     /* <--- works */_x000D_
  vertical-align: middle; /* <--- fails */_x000D_
}_x000D_
_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item>this text should be centered</grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

One might say that display: inline-grid establishes an inline-level container, and that would be true. So why doesn't vertical-align work in grid items?

The reason is that in a grid formatting context, items are treated as block-level elements.

6.1. Grid Item Display

The display value of a grid item is blockified: if the specified display of an in-flow child of an element generating a grid container is an inline-level value, it computes to its block-level equivalent.

In a block formatting context, something the vertical-align property was originally designed for, the browser doesn't expect to find a block-level element in an inline-level container. That's invalid HTML.


CSS Positioning

Lastly, there's a general CSS centering solution that also works in Grid: absolute positioning

This is a good method for centering objects that need to be removed from the document flow. For example, if you want to:

Simply set position: absolute on the element to be centered, and position: relative on the ancestor that will serve as the containing block (it's usually the parent). Something like this:

grid-item {
  position: relative;
  text-align: center;
}

span {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

_x000D_
_x000D_
grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: 1fr 1fr;_x000D_
  grid-auto-rows: 75px;_x000D_
  grid-gap: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  position: relative;_x000D_
  text-align: center;_x000D_
}_x000D_
_x000D_
span, img {_x000D_
  position: absolute;_x000D_
  left: 50%;_x000D_
  top: 50%;_x000D_
  transform: translate(-50%, -50%);_x000D_
}_x000D_
_x000D_
_x000D_
/* can ignore styles below; decorative only */_x000D_
_x000D_
grid-container {_x000D_
  background-color: lightyellow;_x000D_
  border: 1px solid #bbb;_x000D_
  padding: 10px;_x000D_
}_x000D_
_x000D_
grid-item {_x000D_
  background-color: lightgreen;_x000D_
  border: 1px solid #ccc;_x000D_
}
_x000D_
<grid-container>_x000D_
  <grid-item><span>this text should be centered</span></grid-item>_x000D_
  <grid-item><span>this text should be centered</span></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
  <grid-item><img src="http://i.imgur.com/60PVLis.png" width="50" height="50" alt=""></grid-item>_x000D_
</grid-container>
_x000D_
_x000D_
_x000D_

Here's a complete explanation for how this method works:

Here's the section on absolute positioning in the Grid spec:

Are HTTPS headers encrypted?

HTTPS (HTTP over SSL) sends all HTTP content over a SSL tunel, so HTTP content and headers are encrypted as well.

How to add new contacts in android

These examples are fine, I wanted to point out that you can achieve the same result using an Intent. The intent opens the Contacts app with the fields you provide already filled in.

It's up to the user to save the newly created contact.

You can read about it here: https://developer.android.com/training/contacts-provider/modify-data.html

Intent contactIntent = new Intent(ContactsContract.Intents.Insert.ACTION);
contactIntent.setType(ContactsContract.RawContacts.CONTENT_TYPE);

contactIntent
        .putExtra(ContactsContract.Intents.Insert.NAME, "Contact Name")
        .putExtra(ContactsContract.Intents.Insert.PHONE, "5555555555");

startActivityForResult(contactIntent, 1);

startActivityForResult() gives you the opportunity to see the result.

I've noticed the resultCode works on >5.0 devices,

but I have an older Samsung (<5) that always returns RESULT_CANCELLED (0).

Which I understand is the default return if an activity doesn't expect to return anything.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);

    if (requestCode == 1)
    {
        if (resultCode == Activity.RESULT_OK) {
            Toast.makeText(this, "Added Contact", Toast.LENGTH_SHORT).show();
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            Toast.makeText(this, "Cancelled Added Contact", Toast.LENGTH_SHORT).show();
        }
    }
}

Should I use 'border: none' or 'border: 0'?

They are equivalent in effect, pointing to different shortcuts:

border: 0;
//short for..
border-width: 0;

And the other..

border: none;
//short for...
border-style: none;

Both work, just pick one and go with it :)

How to continue the code on the next line in VBA

In VBA (and VB.NET) the line terminator (carriage return) is used to signal the end of a statement. To break long statements into several lines, you need to

Use the line-continuation character, which is an underscore (_), at the point at which you want the line to break. The underscore must be immediately preceded by a space and immediately followed by a line terminator (carriage return).

(From How to: Break and Combine Statements in Code)

In other words: Whenever the interpreter encounters the sequence <space>_<line terminator>, it is ignored and parsing continues on the next line. Note, that even when ignored, the line continuation still acts as a token separator, so it cannot be used in the middle of a variable name, for example. You also cannot continue a comment by using a line-continuation character.

To break the statement in your question into several lines you could do the following:

U_matrix(i, j, n + 1) = _
     k * b_xyt(xi, yi, tn) / (4 * hx * hy) * U_matrix(i + 1, j + 1, n) + _
     (k * (a_xyt(xi, yi, tn) / hx ^ 2 + d_xyt(xi, yi, tn) / (2 * hx)))

(Leading whitespaces are ignored.)

Convert Existing Eclipse Project to Maven Project

If you just want to create a default POM and enable m2eclipse features: so I'm assuming you do not currently have an alternative automated build setup you're trying to import, and I'm assuming you're talking about the m2eclipse plugin.

The m2eclipse plugin provides a right-click option on a project to add this default pom.xml:

Newer M2E versions

Right click on Project -> submenu Configure -> Convert to Maven Project

Older M2E versions

Right click on Project -> submenu Maven -> Enable Dependency Management.

That'll do the necessary to enable the plugin for that project.


To answer 'is there an automatic importer or wizard?': not that I know of. Using the option above will allow you to enable the m2eclipse plugin for your existing project avoiding the manual copying. You will still need to actually set up the dependencies and other stuff you need to build yourself.

Setting dynamic scope variables in AngularJs - scope.<some_string>

Please keep in mind: this is just a JavaScript thing and has nothing to do with Angular JS. So don't be confused about the magical '$' sign ;)

The main problem is that this is an hierarchical structure.

console.log($scope.life.meaning);  // <-- Nope! This is undefined.
=> a.b.c

This is undefined because "$scope.life" is not existing but the term above want to solve "meaning".

A solution should be

var the_string = 'lifeMeaning';
$scope[the_string] = 42;
console.log($scope.lifeMeaning);
console.log($scope['lifeMeaning']);

or with a little more efford.

var the_string_level_one = 'life';
var the_string_level_two = the_string_level_one + '.meaning';
$scope[the_string_level_two ] = 42;
console.log($scope.life.meaning);
console.log($scope['the_string_level_two ']);

Since you can access a structural objecte with

var a = {};
a.b = "ab";
console.log(a.b === a['b']);

There are several good tutorials about this which guide you well through the fun with JavaScript.

There is something about the

$scope.$apply();
do...somthing...bla...bla

Go and search the web for 'angular $apply' and you will find information about the $apply function. And you should use is wisely more this way (if you are not alreay with a $apply phase).

$scope.$apply(function (){
    do...somthing...bla...bla
})

Matrix multiplication in OpenCV

You say that the matrices are the same dimensions, and yet you are trying to perform matrix multiplication on them. Multiplication of matrices with the same dimension is only possible if they are square. In your case, you get an assertion error, because the dimensions are not square. You have to be careful when multiplying matrices, as there are two possible meanings of multiply.

Matrix multiplication is where two matrices are multiplied directly. This operation multiplies matrix A of size [a x b] with matrix B of size [b x c] to produce matrix C of size [a x c]. In OpenCV it is achieved using the simple * operator:

C = A * B

Element-wise multiplication is where each pixel in the output matrix is formed by multiplying that pixel in matrix A by its corresponding entry in matrix B. The input matrices should be the same size, and the output will be the same size as well. This is achieved using the mul() function:

output = A.mul(B);

how to increase sqlplus column output length?

This worked like a charm for me with a CLOB column:

set long 20000000
set linesize 32767
column YOUR_COLUMN_NAME format a32767
select YOUR_COLUMN_NAME from YOUR_TABLE;

Defining constant string in Java?

simply use

final String WELCOME_MESSAGE = "Hello, welcome to the server";

the main part of this instruction is the 'final' keyword.

No module named 'pymysql'

Sort of already answered this in the comments, but just so this question has an answer, the problem was resolved through running:

sudo apt-get install python3-pymysql

Copy folder structure (without files) from one location to another

A python script from Sergiy Kolodyazhnyy posted on Copy only folders not files?:

#!/usr/bin/env python
import os,sys
dirs=[ r for r,s,f in os.walk(".") if r != "."]
for i in dirs:
    os.makedirs(os.path.join(sys.argv[1],i)) 

or from the shell:

python -c 'import os,sys;dirs=[ r for r,s,f in os.walk(".") if r != "."];[os.makedirs(os.path.join(sys.argv[1],i)) for i in dirs]' ~/new_destination

FYI:

Auto Scale TextView Text to Fit within Bounds

Refer to the ScalableTextView.java here Auto-fit TextView for Android. I have added the code to shrink and expand the TextView based on the text length

Add and remove multiple classes in jQuery

easiest way to append class name using javascript. It can be useful when .siblings() are misbehaving.

document.getElementById('myId').className += ' active';

How to reset or change the passphrase for a GitHub SSH key?

You can change the passphrase for your private key by doing:

ssh-keygen -f ~/.ssh/id_rsa -p

HttpUtility does not exist in the current context

It worked for by following process:

Add Reference:

system.net
system.web

also, include the namespace

using system.net
using system.web

How to Compare two Arrays are Equal using Javascript?

Use lodash. In ES6 syntax:

import isEqual from 'lodash/isEqual';
let equal = isEqual([1,2], [1,2]);  // true

Or previous js versions:

var isEqual = require('lodash/isEqual');
var equal = isEqual([1,2], [1,2]);  // true

tmux status bar configuration

The man page has very detailed descriptions of all of the various options (the status bar is highly configurable). Your best bet is to read through man tmux and pay particular attention to those options that begin with status-.

So, for example, status-bg red would set the background colour of the bar.

The three components of the bar, the left and right sections and the window-list in the middle, can all be configured to suit your preferences. status-left and status-right, in addition to having their own variables (like #S to list the session name) can also call custom scripts to display, for example, system information like load average or battery time.

The option to rename windows or panes based on what is currently running in them is automatic-rename. You can set, or disable it globally with:

setw -g automatic-rename [on | off]

The most straightforward way to become comfortable with building your own status bar is to start with a vanilla one and then add changes incrementally, reloading the config as you go.1

You might also want to have a look around on github or bitbucket for other people's conf files to provide some inspiration. You can see mine here2.



1 You can automate this by including this line in your .tmux.conf:

bind R source-file ~/.tmux.conf \; display-message "Config reloaded..."

You can then test your new functionality with Ctrlb,Shiftr. tmux will print a helpful error message—including a line number of the offending snippet—if you misconfigure an option.

2 Note: I call a different status bar depending on whether I am in X or the console - I find this quite useful.

MySQL equivalent of DECODE function in Oracle

The example translates directly to:

Select Name, CASE Age
       WHEN 13 then 'Thirteen' WHEN 14 then 'Fourteen' WHEN 15 then 'Fifteen' WHEN 16 then 'Sixteen'
       WHEN 17 then 'Seventeen' WHEN 18 then 'Eighteen' WHEN 19 then 'Nineteen'
       ELSE 'Adult' END AS AgeBracket
FROM Person

which you may prefer to format e.g. like this:

Select Name,
       CASE Age
         when 13 then 'Thirteen'
         when 14 then 'Fourteen'
         when 15 then 'Fifteen'
         when 16 then 'Sixteen'
         when 17 then 'Seventeen'
         when 18 then 'Eighteen'
         when 19 then 'Nineteen'
         else         'Adult'
       END AS AgeBracket
FROM Person

Select Row number in postgres

SELECT tab.*,
    row_number() OVER () as rnum
  FROM tab;

Here's the relevant section in the docs.

P.S. This, in fact, fully matches the answer in the referenced question.

Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

For layering, Just change the version of targetFramework in web.config file only, the other things no need change.

bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

I'd prefer the built in python html parser, no install no dependencies

soup = BeautifulSoup(s, "html.parser")

What's the difference between utf8_general_ci and utf8_unicode_ci?

Some details (PL)

As we can read here (Peter Gulutzan) there is difference on sorting/comparing polish letter "L" (L with stroke - html esc: &#321;) (lower case: "l" - html esc: &#322;) - we have following assumption:

utf8_polish_ci      L greater than L and less than M
utf8_unicode_ci     L greater than L and less than M
utf8_unicode_520_ci L equal to L
utf8_general_ci     L greater than Z

In polish language letter L is after letter L and before M. No one of this coding is better or worse - it depends of your needs.

Reset textbox value in javascript

Try using this:

$('#searchField').val('');

Insert node at a certain position in a linked list C++

Just have something like this where you traverse till the given position and then insert:

void addNodeAtPos(int data, int pos)
{
  Node* prev = new Node();
  Node* curr = new Node();
  Node* newNode = new Node();
  newNode->data = data;

  int tempPos = 0;   // Traverses through the list

  curr = head;      // Initialize current to head;
  if(head != NULL)
  {
    while(curr->next != NULL && tempPos != pos)
    {
        prev = curr;
        curr = curr->next;
        tempPos++;
    }
    if(pos==0)
    {
       cout << "Adding at Head! " << endl;
       // Call function to addNode from head;
    }
    else if(curr->next == NULL && pos == tempPos+1)
    {
      cout << "Adding at Tail! " << endl;
      // Call function to addNode at tail;
    }
    else if(pos > tempPos+1)
      cout << " Position is out of bounds " << endl;
     //Position not valid

    else
    {
        prev->next = newNode;
        newNode->next = curr;
        cout << "Node added at position: " << pos << endl;
    }
 }
 else
 {
    head = newNode;
    newNode->next=NULL;
    cout << "Added at head as list is empty! " << endl;
 }
}

How to set width of mat-table column in angular?

As i have implemented, and it is working fine. you just need to add column width using matColumnDef="description"

for example :

<mat-table #table [dataSource]="dataSource" matSortDisableClear>
    <ng-container matColumnDef="productId">
        <mat-header-cell *matHeaderCellDef>product ID</mat-header-cell>
        <mat-cell *matCellDef="let product">{{product.id}}</mat-cell>
    </ng-container>
    <ng-container matColumnDef="productName">
        <mat-header-cell *matHeaderCellDef>Name</mat-header-cell>
        <mat-cell *matCellDef="let product">{{product.name}}</mat-cell>
    </ng-container>
    <ng-container matColumnDef="actions">
        <mat-header-cell *matHeaderCellDef>Actions</mat-header-cell>
        <mat-cell *matCellDef="let product">
            <button (click)="view(product)">
                <mat-icon>visibility</mat-icon>
            </button>
        </mat-cell>
    </ng-container>
    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns"></mat-row>
</mat-table>

here matColumnDef is productId, productName and action

now we apply width by matColumnDef

styling

.mat-column-productId {
    flex: 0 0 10%;
}
.mat-column-productName {
    flex: 0 0 50%;
}

and remaining width is equally allocated to other columns

How do I find the current machine's full hostname in C (hostname and domain information)?

The easy way, try uname()

If that does not work, use gethostname() then gethostbyname() and finally gethostbyaddr()

The h_name of hostent{} should be your FQDN

How to do vlookup and fill down (like in Excel) in R?

I also like using qdapTools::lookup or shorthand binary operator %l%. It works identically to an Excel vlookup, but it accepts name arguments opposed to column numbers

## Replicate Ben's data:
hous <- structure(list(HouseType = c("Semi", "Single", "Row", "Single", 
    "Apartment", "Apartment", "Row"), HouseTypeNo = c(1L, 2L, 3L, 
    2L, 4L, 4L, 3L)), .Names = c("HouseType", "HouseTypeNo"), 
    class = "data.frame", row.names = c(NA, -7L))


largetable <- data.frame(HouseType = as.character(sample(unique(hous$HouseType), 
    1000, replace = TRUE)), stringsAsFactors = FALSE)


## It's this simple:
library(qdapTools)
largetable[, 1] %l% hous

How to use z-index in svg elements?

As others here have said, z-index is defined by the order the element appears in the DOM. If manually reordering your html isn't an option or would be difficult, you can use D3 to reorder SVG groups/objects.

Use D3 to Update DOM Order and Mimic Z-Index Functionality

Updating SVG Element Z-Index With D3

At the most basic level (and if you aren't using IDs for anything else), you can use element IDs as a stand-in for z-index and reorder with those. Beyond that you can pretty much let your imagination run wild.

Examples in code snippet

_x000D_
_x000D_
var circles = d3.selectAll('circle')_x000D_
var label = d3.select('svg').append('text')_x000D_
    .attr('transform', 'translate(' + [5,100] + ')')_x000D_
_x000D_
var zOrders = {_x000D_
    IDs: circles[0].map(function(cv){ return cv.id; }),_x000D_
    xPos: circles[0].map(function(cv){ return cv.cx.baseVal.value; }),_x000D_
    yPos: circles[0].map(function(cv){ return cv.cy.baseVal.value; }),_x000D_
    radii: circles[0].map(function(cv){ return cv.r.baseVal.value; }),_x000D_
    customOrder: [3, 4, 1, 2, 5]_x000D_
}_x000D_
_x000D_
var setOrderBy = 'IDs';_x000D_
var setOrder = d3.descending;_x000D_
_x000D_
label.text(setOrderBy);_x000D_
circles.data(zOrders[setOrderBy])_x000D_
circles.sort(setOrder);
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>_x000D_
_x000D_
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 100"> _x000D_
  <circle id="1" fill="green" cx="50" cy="40" r="20"/> _x000D_
  <circle id="2" fill="orange" cx="60" cy="50" r="18"/>_x000D_
  <circle id="3" fill="red" cx="40" cy="55" r="10"/> _x000D_
  <circle id="4" fill="blue" cx="70" cy="20" r="30"/> _x000D_
  <circle id="5" fill="pink" cx="35" cy="20" r="15"/> _x000D_
</svg>
_x000D_
_x000D_
_x000D_

The basic idea is:

  1. Use D3 to select the SVG DOM elements.

    var circles = d3.selectAll('circle')
    
  2. Create some array of z-indices with a 1:1 relationship with your SVG elements (that you want to reorder). Z-index arrays used in the examples below are IDs, x & y position, radii, etc....

    var zOrders = {
        IDs: circles[0].map(function(cv){ return cv.id; }),
        xPos: circles[0].map(function(cv){ return cv.cx.baseVal.value; }),
        yPos: circles[0].map(function(cv){ return cv.cy.baseVal.value; }),
        radii: circles[0].map(function(cv){ return cv.r.baseVal.value; }),
        customOrder: [3, 4, 1, 2, 5]
    }
    
  3. Then, use D3 to bind your z-indices to that selection.

    circles.data(zOrders[setOrderBy]);
    
  4. Lastly, call D3.sort to reorder the elements in the DOM based on the data.

    circles.sort(setOrder);
    

Examples

enter image description here

  • You can stack by ID

enter image description here

  • With leftmost SVG on top

enter image description here

  • Smallest radii on top

enter image description here

  • Or Specify an array to apply z-index for a specific ordering -- in my example code the array [3,4,1,2,5] moves/reorders the 3rd circle (in the original HTML order) to be 1st in the DOM, 4th to be 2nd, 1st to be 3rd, and so on...

ValueError: Wrong number of items passed - Meaning and suggestions?

for i in range(100):
try:
  #Your code here
  break
except:
  continue

This one worked for me.

Get yesterday's date in bash on Linux, DST-safe

I think this should work, irrespective of how often and when you run it ...

date -d "yesterday 13:00" '+%Y-%m-%d'

How can I align the columns of tables in Bash?

Not sure where you were running this, but the code you posted would not produce the output you gave, at least not in the bash that I'm familiar with.

Try this instead:

stringarray=('test' 'some thing' 'very long long long string' 'blah')
numberarray=(1 22 7777 8888888888)
anotherfieldarray=('other' 'mixed' 456 'data')
array_size=4

for((i=0;i<array_size;i++))
do
    echo ${stringarray[$i]} $'\x1d' ${numberarray[$i]} $'\x1d' ${anotherfieldarray[$i]}
done | column -t -s$'\x1d'

Note that I'm using the group seperator character (1d) intead of tab, because if you are getting these arrays from a file, they might contain tabs.

How to convert list to string

>>> L = [1,2,3]       
>>> " ".join(str(x) for x in L)
'1 2 3'

jQuery AutoComplete Trigger Change Event

Well it works for me just binding a keypress event to the search input, like this:

... Instantiate your autofill here...

    $("#CompanyList").bind("keypress", function(){
    if (nowDoing==1) {
        nowDoing = 0;
        $('#form_459174').clearForm();
    }        
});

Single vs Double quotes (' vs ")

I use " as a top-tier and ' as a second tier, as I imagine most people do. For example

<a href="#" onclick="alert('Clicked!');">Click Me!</a>

In that example, you must use both, it is unavoidable.

How to make a owl carousel with arrows instead of next previous

This is how you do it in your $(document).ready() function with FontAwesome Icons:

 $( ".owl-prev").html('<i class="fa fa-chevron-left"></i>');
 $( ".owl-next").html('<i class="fa fa-chevron-right"></i>');

How to convert an int to string in C?

If you want to output your structure into a file there is no need to convert any value beforehand. You can just use the printf format specification to indicate how to output your values and use any of the operators from printf family to output your data.

How to input a string from user into environment variable from batch file

A rather roundabout way, just for completeness:

 for /f "delims=" %i in ('type CON') do set inp=%i

Of course that requires ^Z as a terminator, and so the Johannes answer is better in all practical ways.

Marker content (infoWindow) Google Maps

Although this question has already been answered, I think this approach is better : http://jsfiddle.net/kjy112/3CvaD/ extract from this question on StackOverFlow google maps - open marker infowindow given the coordinates:

Each marker gets an "infowindow" entry :

function createMarker(lat, lon, html) {
    var newmarker = new google.maps.Marker({
        position: new google.maps.LatLng(lat, lon),
        map: map,
        title: html
    });

    newmarker['infowindow'] = new google.maps.InfoWindow({
            content: html
        });

    google.maps.event.addListener(newmarker, 'mouseover', function() {
        this['infowindow'].open(map, this);
    });
}

How can I easily view the contents of a datatable or dataview in the immediate window

The Visual Studio debugger comes with four standard visualizers. These are the text, HTML, and XML visualizers, all of which work on string objects, and the dataset visualizer, which works for DataSet, DataView, and DataTable objects.

To use it, break into your code, mouse over your DataSet, expand the quick watch, view the Tables, expand that, then view Table[0] (for example). You will see something like {Table1} in the quick watch, but notice that there is also a magnifying glass icon. Click on that icon and your DataTable will open up in a grid view.

enter image description here

Timer Interval 1000 != 1 second?

Instead of Tick event, use Elapsed event.

timer.Elapsed += new EventHandler(TimerEventProcessor);

and change the signiture of TimerEventProcessor method;

private void TimerEventProcessor(object sender, ElapsedEventArgs e)
{
  label1.Text = _counter.ToString();
  _counter += 1;
}

What are the most useful Intellij IDEA keyboard shortcuts?

This link has everything you need. Plus in Idea 8 atleast, every shortcut is completely customizable, so it's really up to you what the most useful ones are.

Idea 8 reference PDF

Unresponsive KeyListener for JFrame

I got the same problem until i read that the real problem is about FOCUS the your JFrame has already added Listeners but tour frame is never on Focus because you got a lot of components inside your JFrame that also are focusable so try:

JFrame.setFocusable(true);

Good Luck

How do I make an Android EditView 'Done' button and hide the keyboard when clicked?

If you don't want any button at all (e.g. you are developing a GUI for blind people where tap cannot be positional and you rely on single/double/long taps):

text.setItemOptions(EditorInfo.IME_ACTION_NONE)

Or in Kotlin:

text.imeOptions = EditorInfo.IME_ACTION_NONE

CardView Corner Radius

You need to do 2 things :

1) Call setPreventCornerOverlap(false) on your CardView.

2) Put rounded Imageview inside CardView

About rounding your imageview, I had the same problem so I made a library that you can set different radii on each corner. Finally I got the result what I wanted like below.

https://github.com/pungrue26/SelectableRoundedImageView

Rounded ImageView inside CardView

Passing arguments to JavaScript function from code-behind

I think you want to execute the javascript serverside and not in the browser after post-back, right?

That's not possible as far as I know

If you just want to get it execute after postback, you can do something like this:

this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "xx", "<script>test("+x+","+y+");</script>");

jQuery selectors on custom data attributes using HTML5

$("ul[data-group='Companies'] li[data-company='Microsoft']") //Get all elements with data-company="Microsoft" below "Companies"

$("ul[data-group='Companies'] li:not([data-company='Microsoft'])") //get all elements with data-company!="Microsoft" below "Companies"

Look in to jQuery Selectors :contains is a selector

here is info on the :contains selector

How does the "view" method work in PyTorch?

What is the meaning of parameter -1?

You can read -1 as dynamic number of parameters or "anything". Because of that there can be only one parameter -1 in view().

If you ask x.view(-1,1) this will output tensor shape [anything, 1] depending on the number of elements in x. For example:

import torch
x = torch.tensor([1, 2, 3, 4])
print(x,x.shape)
print("...")
print(x.view(-1,1), x.view(-1,1).shape)
print(x.view(1,-1), x.view(1,-1).shape)

Will output:

tensor([1, 2, 3, 4]) torch.Size([4])
...
tensor([[1],
        [2],
        [3],
        [4]]) torch.Size([4, 1])
tensor([[1, 2, 3, 4]]) torch.Size([1, 4])

dropping infinite values from dataframes in pandas?

The above solution will modify the infs that are not in the target columns. To remedy that,

lst = [np.inf, -np.inf]
to_replace = {v: lst for v in ['col1', 'col2']}
df.replace(to_replace, np.nan)

NSPhotoLibraryUsageDescription key must be present in Info.plist to use camera roll

In order to save or retrieve an image from the camera roll. Additionally, you need to ask the user for the permission otherwise you'll get this error or your app may get crashed. To save yourself from this add this into your info.plist

<key>NSPhotoLibraryAddUsageDescription</key>
<string>This app requires read and write permission from the user.</string>

In the case of Xamarin.iOS

 if you're adding it from the generic editor then "Privacy - Photo Library Additions Usage Description" will be the given option you will find out instead of "NSPhotoLibraryAddUsageDescription".

What are OLTP and OLAP. What is the difference between them?

The difference is quite simple:

OLTP (Online Transaction Processing)

OLTP is a class of information systems that facilitate and manage transaction-oriented applications. OLTP has also been used to refer to processing in which the system responds immediately to user requests. Online transaction processing applications are high throughput and insert or update-intensive in database management. Some examples of OLTP systems include order entry, retail sales, and financial transaction systems.

OLAP (Online Analytical Processing)

OLAP is part of the broader category of business intelligence, which also encompasses relational database, report writing and data mining. Typical applications of OLAP include business reporting for sales, marketing, management reporting, business process management (BPM), budgeting and forecasting, financial reporting and similar areas.

See more details OLTP and OLAP

Pass a JavaScript function as parameter

Example 1:

funct("z", function (x) { return x; });

function funct(a, foo){
    foo(a) // this will return a
}

Example 2:

function foodemo(value){
    return 'hello '+value;
}

function funct(a, foo){
    alert(foo(a));
}

//call funct    
funct('world!',foodemo); //=> 'hello world!'

look at this

What is the best way to extract the first word from a string in Java?

The simple one I used to do is

str.contains(" ") ? str.split(" ")[0] : str

Where str is your string or text bla bla :). So, if

  1. str is having empty value it returns as it is.
  2. str is having one word, it returns as it is.
  3. str is multiple words, it extract the first word and return.

Hope this is helpful.

How to run Maven from another directory (without cd to project dir)?

You can try this:

pushd ../
maven install [...]
popd

Copy Paste Values only( xlPasteValues )

since you only want values copied, you can pass the values of arr1 directly to arr2 and avoid copy/paste. code inside the loop:

      Sheets("SheetB").Range(arr2(i) & firstrowDB).Resize(lastrow, 1).Value = .Range(.Cells(1, arr1(i)), .Cells(lastrow, arr1(i))).Value

string decode utf-8

Try looking at decode string encoded in utf-8 format in android but it doesn't look like your string is encoded with anything particular. What do you think the output should be?

What is useState() in React?

useState is one of the hooks available in React v16.8.0. It basically lets you turn your otherwise non-stateful/functional components to one that can have its own state.

At the very basic level, it's used this way:

const [isLoading, setLoading] = useState(true);

This then lets you call setLoading passing a boolean value. It's a cool way of having "stateful" functional component.

How to suppress warnings globally in an R Script

You could use

options(warn=-1)

But note that turning off warning messages globally might not be a good idea.

To turn warnings back on, use

options(warn=0)

(or whatever your default is for warn, see this answer)

Why is enum class preferred over plain enum?

  1. do not implicitly convert to int
  2. can choose which type underlie
  3. ENUM namespace to avoid polluting happen
  4. Compared with normal class, can be declared forward, but do not have methods

How do I "commit" changes in a git submodule?

Before you can commit and push, you need to init a working repository tree for a submodule. I am using tortoise and do following things:

First check if there exist .git file (not a directory)

  • if there is such file it contains path to supermodule git directory
  • delete this file
  • do git init
  • do git add remote path the one used for submodule
  • follow instructions below

If there was .git file, there surly was .git directory which tracks local tree. You still need to a branch (you can create one) or switch to master (which sometimes does not work). Best to do is - git fetch - git pull. Do not omit fetch.

Now your commits and pulls will be synchronized with your origin/master

Using Switch Statement to Handle Button Clicks

I have found that the simplest way to do this is to set onClick for each button in the xml

<Button
android:id="@+id/vrHelp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/ic_menu_help"
android:onClick="helpB" />

and then you can do a switch case like this

  public void helpB(View v) {
    Button clickedButton = (Button) v;
    switch (clickedButton.getId()) {
      case R.id.vrHelp:
        dosomething...
        break;

      case R.id.coHelp:
        dosomething...
        break;

      case R.id.ksHelp:
        dosomething...
        break;

      case R.id.uHelp:
        dosomething...
        break;

      case R.id.pHelp:
        dosomething...
        break;
    }
  }

Sending message through WhatsApp

To check if WhatsApp is installed in device and initiate "click to chat" in WhatsApp:

Kotlin:

try {
    // Check if whatsapp is installed
    context?.packageManager?.getPackageInfo("com.whatsapp", PackageManager.GET_META_DATA)
    val intent = Intent(Intent.ACTION_VIEW, Uri.parse("https://wa.me/$internationalPhoneNumber"))
    startActivity(intent)
} catch (e: NameNotFoundException) {
    Toast.makeText(context, "WhatsApp not Installed", Toast.LENGTH_SHORT).show()
}

Java:

try {
    // Check if whatsapp is installed
    getPackageManager().getPackageInfo("com.whatsapp", PackageManager.GET_META_DATA);
    Intent intent = Intent(Intent.ACTION_VIEW, Uri.parse("https://wa.me/" + internationalPhoneNumber));
    startActivity(intent);
} catch (NameNotFoundException e) {
    Toast.makeText(context, "WhatsApp not Installed", Toast.LENGTH_SHORT).show();
}

getPackageInfo() throws NameNotFoundException if WhatsApp is not installed.

The internationalPhoneNumber variable is used to access the phone number.

Reference:

Command to delete all pods in all kubernetes namespaces

Delete all PODs in all Namespace only (restart deployment)

 kubectl get pod -A -o yaml | kubectl delete -f -

Initializing C dynamic arrays

p = {1,2,3} is wrong.

You can never use this:

int * p;
p = {1,2,3};

loop is right

int *p,i;
p = malloc(3*sizeof(int));
for(i = 0; i<3; ++i)
    p[i] = i;

How to import JSON File into a TypeScript file?

As stated in this reddit post, after Angular 7, you can simplify things to these 2 steps:

  1. Add those three lines to compilerOptions in your tsconfig.json file:
"resolveJsonModule": true,
"esModuleInterop": true,
"allowSyntheticDefaultImports": true
  1. Import your json data:
import myData from '../assets/data/my-data.json';

And that's it. You can now use myDatain your components/services.

How to make cross domain request

Do a cross-domain AJAX call

Your web-service must support method injection in order to do JSONP.

Your code seems fine and it should work if your web services and your web application hosted in the same domain.

When you do a $.ajax with dataType: 'jsonp' meaning that jQuery is actually adding a new parameter to the query URL.

For instance, if your URL is http://10.211.2.219:8080/SampleWebService/sample.do then jQuery will add ?callback={some_random_dynamically_generated_method}.

This method is more kind of a proxy actually attached in window object. This is nothing specific but does look something like this:

window.some_random_dynamically_generated_method = function(actualJsonpData) {
    //here actually has reference to the success function mentioned with $.ajax
    //so it just calls the success method like this: 
    successCallback(actualJsonData);
}

Check the following for more information

Make cross-domain ajax JSONP request with jQuery

Python 2.7: %d, %s, and float()

See String Formatting Operations:

%d is the format code for an integer. %f is the format code for a float.

%s prints the str() of an object (What you see when you print(object)).

%r prints the repr() of an object (What you see when you print(repr(object)).

For a float %s, %r and %f all display the same value, but that isn't the case for all objects. The other fields of a format specifier work differently as well:

>>> print('%10.2s' % 1.123) # print as string, truncate to 2 characters in a 10-place field.
        1.
>>> print('%10.2f' % 1.123) # print as float, round to 2 decimal places in a 10-place field.
      1.12

What does the "yield" keyword do?

There is one type of answer that I don't feel has been given yet, among the many great answers that describe how to use generators. Here is the programming language theory answer:

The yield statement in Python returns a generator. A generator in Python is a function that returns continuations (and specifically a type of coroutine, but continuations represent the more general mechanism to understand what is going on).

Continuations in programming languages theory are a much more fundamental kind of computation, but they are not often used, because they are extremely hard to reason about and also very difficult to implement. But the idea of what a continuation is, is straightforward: it is the state of a computation that has not yet finished. In this state, the current values of variables, the operations that have yet to be performed, and so on, are saved. Then at some point later in the program the continuation can be invoked, such that the program's variables are reset to that state and the operations that were saved are carried out.

Continuations, in this more general form, can be implemented in two ways. In the call/cc way, the program's stack is literally saved and then when the continuation is invoked, the stack is restored.

In continuation passing style (CPS), continuations are just normal functions (only in languages where functions are first class) which the programmer explicitly manages and passes around to subroutines. In this style, program state is represented by closures (and the variables that happen to be encoded in them) rather than variables that reside somewhere on the stack. Functions that manage control flow accept continuation as arguments (in some variations of CPS, functions may accept multiple continuations) and manipulate control flow by invoking them by simply calling them and returning afterwards. A very simple example of continuation passing style is as follows:

def save_file(filename):
  def write_file_continuation():
    write_stuff_to_file(filename)

  check_if_file_exists_and_user_wants_to_overwrite(write_file_continuation)

In this (very simplistic) example, the programmer saves the operation of actually writing the file into a continuation (which can potentially be a very complex operation with many details to write out), and then passes that continuation (i.e, as a first-class closure) to another operator which does some more processing, and then calls it if necessary. (I use this design pattern a lot in actual GUI programming, either because it saves me lines of code or, more importantly, to manage control flow after GUI events trigger.)

The rest of this post will, without loss of generality, conceptualize continuations as CPS, because it is a hell of a lot easier to understand and read.


Now let's talk about generators in Python. Generators are a specific subtype of continuation. Whereas continuations are able in general to save the state of a computation (i.e., the program's call stack), generators are only able to save the state of iteration over an iterator. Although, this definition is slightly misleading for certain use cases of generators. For instance:

def f():
  while True:
    yield 4

This is clearly a reasonable iterable whose behavior is well defined -- each time the generator iterates over it, it returns 4 (and does so forever). But it isn't probably the prototypical type of iterable that comes to mind when thinking of iterators (i.e., for x in collection: do_something(x)). This example illustrates the power of generators: if anything is an iterator, a generator can save the state of its iteration.

To reiterate: Continuations can save the state of a program's stack and generators can save the state of iteration. This means that continuations are more a lot powerful than generators, but also that generators are a lot, lot easier. They are easier for the language designer to implement, and they are easier for the programmer to use (if you have some time to burn, try to read and understand this page about continuations and call/cc).

But you could easily implement (and conceptualize) generators as a simple, specific case of continuation passing style:

Whenever yield is called, it tells the function to return a continuation. When the function is called again, it starts from wherever it left off. So, in pseudo-pseudocode (i.e., not pseudocode, but not code) the generator's next method is basically as follows:

class Generator():
  def __init__(self,iterable,generatorfun):
    self.next_continuation = lambda:generatorfun(iterable)

  def next(self):
    value, next_continuation = self.next_continuation()
    self.next_continuation = next_continuation
    return value

where the yield keyword is actually syntactic sugar for the real generator function, basically something like:

def generatorfun(iterable):
  if len(iterable) == 0:
    raise StopIteration
  else:
    return (iterable[0], lambda:generatorfun(iterable[1:]))

Remember that this is just pseudocode and the actual implementation of generators in Python is more complex. But as an exercise to understand what is going on, try to use continuation passing style to implement generator objects without use of the yield keyword.

Python script header


I'd suggest 3 things in the beginning of your script:

First, as already being said use environment:

#!/usr/bin/env python

Second, set your encoding:

# -*- coding: utf-8 -*-

Third, set some doc string:

"""This is a awesome
    python script!"""

And for sure I would use " " (4 spaces) for ident.
Final header will look like:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""This is a awesome
        python script!"""


Best wishes and happy coding.

How to Insert Double or Single Quotes

Why not just use a custom format for the cell you need to quote?

If you set a custom format to the cell column, all values will take on that format.

For numbers....like a zip code....it would be this '#' For string text, it would be this '@'

You save the file as csv format, and it will have all the quotes wrapped around the cell data as needed.

Python's most efficient way to choose longest string in list?

def longestWord(some_list): 
    count = 0    #You set the count to 0
    for i in some_list: # Go through the whole list
        if len(i) > count: #Checking for the longest word(string)
            count = len(i)
            word = i
    return ("the longest string is " + word)

or much easier:

max(some_list , key = len)

What is middleware exactly?

it is a software layer between the operating system and applications on each side of a distributed computing system in a network. In fact it connects heterogeneous network and software systems.

The content type application/xml;charset=utf-8 of the response message does not match the content type of the binding (text/xml; charset=utf-8)

We use the Url Rewrite extension for IIS for redirecting all HTTP requests to HTTPS. When trying to call a service not using transport security on an http://... address, this is the error that appeared.

So it might be worth checking if you can hit both the http and https addresses of the service via a browser and that it doesn't auto forward you with a 303 status code.

Handling errors in Promise.all

You can always wrap your promise returning functions in a way that they catches failure and returning instead an agreed value (e.g. error.message), so the exception won't roll all the way up to the Promise.all function and disable it.

async function resetCache(ip) {

    try {

        const response = await axios.get(`http://${ip}/resetcache`);
        return response;

    }catch (e) {

        return {status: 'failure', reason: 'e.message'};
    }

}

Find Java classes implementing an interface

Awhile ago, I put together a package for doing what you want, and more. (I needed it for a utility I was writing). It uses the ASM library. You can use reflection, but ASM turned out to perform better.

I put my package in an open source library I have on my web site. The library is here: http://software.clapper.org/javautil/. You want to start with the with ClassFinder class.

The utility I wrote it for is an RSS reader that I still use every day, so the code does tend to get exercised. I use ClassFinder to support a plug-in API in the RSS reader; on startup, it looks in a couple directory trees for jars and class files containing classes that implement a certain interface. It's a lot faster than you might expect.

The library is BSD-licensed, so you can safely bundle it with your code. Source is available.

If that's useful to you, help yourself.

Update: If you're using Scala, you might find this library to be more Scala-friendly.

python catch exception and continue try block

'continue' is allowed within an 'except' or 'finally' only if the try block is in a loop. 'continue' will cause the next iteration of the loop to start.

So you can try put your two or more functions in a list and use loop to call your function.

Like this:

funcs = [f,g]
for func in funcs:
    try: func()
    except: continue

For full information you can go to this link

How can I convert a Word document to PDF?

Docx4j is open source and the best API for convert Docx to pdf without any alignment or font issue.

Maven Dependencies:

<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-JAXB-Internal</artifactId>
    <version>8.0.0</version>
</dependency>
<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-JAXB-ReferenceImpl</artifactId>
    <version>8.0.0</version>
</dependency>
<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-JAXB-MOXy</artifactId>
    <version>8.0.0</version>
</dependency>
<dependency>
    <groupId>org.docx4j</groupId>
    <artifactId>docx4j-export-fo</artifactId>
    <version>8.0.0</version>
</dependency>

Code:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.docx4j.Docx4J;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;

public class DocToPDF {

    public static void main(String[] args) {
        
        try {
            InputStream templateInputStream = new FileInputStream("D:\\\\Workspace\\\\New\\\\Sample.docx");
            WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(templateInputStream);
            MainDocumentPart documentPart = wordMLPackage.getMainDocumentPart();

            String outputfilepath = "D:\\\\Workspace\\\\New\\\\Sample.pdf";
            FileOutputStream os = new FileOutputStream(outputfilepath);
            Docx4J.toPDF(wordMLPackage,os);
            os.flush();
            os.close();
        } catch (Throwable e) {

            e.printStackTrace();
        } 
    }

}

What is the advantage of using REST instead of non-REST HTTP?

It's written down in the Fielding dissertation. But if you don't want to read a lot:

  • increased scalability (due to stateless, cache and layered system constraints)
  • decoupled client and server (due to stateless and uniform interface constraints)
    • reusable clients (client can use general REST browsers and RDF semantics to decide which link to follow and how to display the results)
    • non breaking clients (clients break only by application specific semantics changes, because they use the semantics instead of some API specific knowledge)

Git vs Team Foundation Server

People need to put down the gun, step away from the ledge, and think for a minute. It turns out there are objective, concrete, and undeniable advantages to DVCS that will make a HUGE difference in a team's productivity.

It all comes down to Branching and Merging.

Before DVCS, the guiding principle was "Pray to God that you don't have to get into branching and merging. And if you do, at least beg Him to let it be very, very simple."

Now, with DVCS, branching (and merging) is so much improved, the guiding principle is, "Do it at the drop of a hat. It will give you a ton of benefits and not cause you any problems."

And that is a HUGE productivity booster for any team.

The problem is, for people to understand what I just said and be convinced that it is true, they have to first invest in a little bit of a learning curve. They don't have to learn Git or any other DVCS itself ... they just need to learn how Git does branching and merging. Read and re-read some articles and blog posts, taking it slow, and working through it until you see it. That might take the better part of 2 or 3 full days.

But once you see that, you won't even consider choosing a non-DVCS. Because there really are clear, objective, concrete advantages to DVCS, and the biggest wins are in the area of branching and merging.

Getting the minimum of two values in SQL

Use a temp table to insert the range of values, then select the min/max of the temp table from within a stored procedure or UDF. This is a basic construct, so feel free to revise as needed.

For example:

CREATE PROCEDURE GetMinSpeed() AS
BEGIN

    CREATE TABLE #speed (Driver NVARCHAR(10), SPEED INT);
    '
    ' Insert any number of data you need to sort and pull from
    '
    INSERT INTO #speed (N'Petty', 165)
    INSERT INTO #speed (N'Earnhardt', 172)
    INSERT INTO #speed (N'Patrick', 174)

    SELECT MIN(SPEED) FROM #speed

    DROP TABLE #speed

END

Change icons of checked and unchecked for Checkbox for Android

it's android:button="@drawable/selector_checkbox" to make it work

How to check queue length in Python

Yes we can check the length of queue object created from collections.

from collections import deque
class Queue():
    def __init__(self,batchSize=32):
        #self.batchSie = batchSize
        self._queue = deque(maxlen=batchSize)

    def enqueue(self, items):
        ''' Appending the items to the queue'''
        self._queue.append(items)

    def dequeue(self):
        '''remoe the items from the top if the queue becomes full '''
        return self._queue.popleft()

Creating an object of class

q = Queue(batchSize=64)
q.enqueue([1,2])
q.enqueue([2,3])
q.enqueue([1,4])
q.enqueue([1,22])

Now retrieving the length of the queue

#check the len of queue
print(len(q._queue)) 
#you can print the content of the queue
print(q._queue)
#Can check the content of the queue
print(q.dequeue())
#Check the length of retrieved item 
print(len(q.dequeue()))

check the results in attached screen shot

enter image description here

Hope this helps...

"unable to locate adb" using Android Studio

I use android studio in Windows 7 and i have AVG for antivirus. The first time you launch adb, AVG prompts you to add avg.exe in antivirus vault. If you accept, then you android studio dont have access to run adb.exe. So open avg >> options >> Virus Vault >> Restore (select the adb file)

Get index of a key/value pair in a C# dictionary based on the value

Let's say you have a Dictionary called fooDictionary

fooDictionary.Values.ToList().IndexOf(someValue);

Values.ToList() converts your dictionary values into a List of someValue objects.

IndexOf(someValue) searches your new List looking for the someValue object in question and returns the Index which would match the index of the Key/Value pair in the dictionary.

This method does not care about the dictionary keys, it simply returns the index of the value that you are looking for.

This does not however account for the issue that there may be several matching "someValue" objects.

Axios handling errors

I tried using the try{}catch{} method but it did not work for me. However, when I switched to using .then(...).catch(...), the AxiosError is caught correctly that I can play around with. When I try the former when putting a breakpoint, it does not allow me to see the AxiosError and instead, says to me that the caught error is undefined, which is also what eventually gets displayed in the UI.

Not sure why this happens I find it very trivial. Either way due to this, I suggest using the conventional .then(...).catch(...) method mentioned above to avoid throwing undefined errors to the user.

Get all Attributes from a HTML element with Javascript/jQuery

You can use this simple plugin as $('#some_id').getAttributes();

(function($) {
    $.fn.getAttributes = function() {
        var attributes = {}; 

        if( this.length ) {
            $.each( this[0].attributes, function( index, attr ) {
                attributes[ attr.name ] = attr.value;
            } ); 
        }

        return attributes;
    };
})(jQuery);

How to avoid precompiled headers

You can always disable the use of pre-compiled headers in the project settings.

Instructions for VS 2010 (should be similar for other versions of VS):

Select your project, use the "Project -> Properties" menu and go to the "Configuration Properties -> C/C++ -> Precompiled Headers" section, then change the "Precompiled Header" setting to "Not Using Precompiled Headers" option.


If you are only trying to setup a minimal Visual Studio project for simple C++ command-line programs (such as those developed in introductory C++ programming classes), you can create an empty C++ project.

HAProxy redirecting http to https (ssl)

Why don't you use ACL's to distinguish traffic? on top of my head:

acl go_sslwebserver path bar
use_backend sslwebserver if go_sslwebserver

This goes on top of what Matthew Brown answered.

See the ha docs , search for things like hdr_dom and below to find more ACL options. There are plenty of choices.

Difference between a View's Padding and Margin

Padding means space between widget and widget original frame. But the margin is space between widget's original frame to boundaries other widget's frame.enter image description here.

Paritition array into N chunks with Numpy

Just some examples on usage of array_split, split, hsplit and vsplit:

n [9]: a = np.random.randint(0,10,[4,4])

In [10]: a
Out[10]: 
array([[2, 2, 7, 1],
       [5, 0, 3, 1],
       [2, 9, 8, 8],
       [5, 7, 7, 6]])

Some examples on using array_split:
If you give an array or list as second argument you basically give the indices (before) which to 'cut'

# split rows into 0|1 2|3
In [4]: np.array_split(a, [1,3])
Out[4]:                                                                                                                       
[array([[2, 2, 7, 1]]),                                                                                                       
 array([[5, 0, 3, 1],                                                                                                         
       [2, 9, 8, 8]]),                                                                                                        
 array([[5, 7, 7, 6]])]

# split columns into 0| 1 2 3
In [5]: np.array_split(a, [1], axis=1)                                                                                           
Out[5]:                                                                                                                       
[array([[2],                                                                                                                  
       [5],                                                                                                                   
       [2],                                                                                                                   
       [5]]),                                                                                                                 
 array([[2, 7, 1],                                                                                                            
       [0, 3, 1],
       [9, 8, 8],
       [7, 7, 6]])]

An integer as second arg. specifies the number of equal chunks:

In [6]: np.array_split(a, 2, axis=1)
Out[6]: 
[array([[2, 2],
       [5, 0],
       [2, 9],
       [5, 7]]),
 array([[7, 1],
       [3, 1],
       [8, 8],
       [7, 6]])]

split works the same but raises an exception if an equal split is not possible

In addition to array_split you can use shortcuts vsplit and hsplit.
vsplit and hsplit are pretty much self-explanatry:

In [11]: np.vsplit(a, 2)
Out[11]: 
[array([[2, 2, 7, 1],
       [5, 0, 3, 1]]),
 array([[2, 9, 8, 8],
       [5, 7, 7, 6]])]

In [12]: np.hsplit(a, 2)
Out[12]: 
[array([[2, 2],
       [5, 0],
       [2, 9],
       [5, 7]]),
 array([[7, 1],
       [3, 1],
       [8, 8],
       [7, 6]])]

How to use SearchView in Toolbar Android

Integrating SearchView with RecyclerView

1) Add SearchView Item in Menu

SearchView can be added as actionView in menu using

app:useActionClass = "android.support.v7.widget.SearchView" .

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="rohksin.com.searchviewdemo.MainActivity">
<item
    android:id="@+id/searchBar"
    app:showAsAction="always"
    app:actionViewClass="android.support.v7.widget.SearchView"
    />
</menu>

2) Implement SearchView.OnQueryTextListener in your Activity

SearchView.OnQueryTextListener has two abstract methods. So your activity skeleton would now look like this after implementing SearchView text listener.

YourActivity extends AppCompatActivity implements SearchView.OnQueryTextListener{

   public boolean onQueryTextSubmit(String query)

   public boolean onQueryTextChange(String newText) 

}

3) Set up SerchView Hint text, listener etc

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);

    MenuItem searchItem = menu.findItem(R.id.searchBar);

    SearchView searchView = (SearchView) searchItem.getActionView();
    searchView.setQueryHint("Search People");
    searchView.setOnQueryTextListener(this);
    searchView.setIconified(false);

    return true;
}

4) Implement SearchView.OnQueryTextListener

This is how you can implement abstract methods of the listener.

@Override
public boolean onQueryTextSubmit(String query) {

    // This method can be used when a query is submitted eg. creating search history using SQLite DB

    Toast.makeText(this, "Query Inserted", Toast.LENGTH_SHORT).show();
    return true;
}

@Override
public boolean onQueryTextChange(String newText) {

    adapter.filter(newText);
    return true;
}

5) Write a filter method in your RecyclerView Adapter.

You can come up with your own logic based on your requirement. Here is the sample code snippet to show the list of Name which contains the text typed in the SearchView.

public void filter(String queryText)
{
    list.clear();

    if(queryText.isEmpty())
    {
        list.addAll(copyList);
    }
    else
    {

        for(String name: copyList)
        {
            if(name.toLowerCase().contains(queryText.toLowerCase()))
            {
                list.add(name);
            }
        }

    }

    notifyDataSetChanged();
}

Full working code sample can be found > HERE
You can also check out the code on SearchView with an SQLite database in this Music App

In Mongoose, how do I sort by date? (node.js)

Been dealing with this issue today using Mongoose 3.5(.2) and none of the answers quite helped me solve this issue. The following code snippet does the trick

Post.find().sort('-posted').find(function (err, posts) {
    // user posts array
});

You can send any standard parameters you need to find() (e.g. where clauses and return fields) but no callback. Without a callback it returns a Query object which you chain sort() on. You need to call find() again (with or without more parameters -- shouldn't need any for efficiency reasons) which will allow you to get the result set in your callback.

What are invalid characters in XML

Anyone tried this System.Security.SecurityElement.Escape(yourstring)? This will replace invalid XML characters in a string with their valid equivalent.

Calculate business days

Here is a recursive solution. It can easily be modified to only keep track of and return the latest date.

//  Returns a $numBusDays-sized array of all business dates, 
//  starting from and including $currentDate. 
//  Any date in $holidays will be skipped over.

function getWorkingDays($currentDate, $numBusDays, $holidays = array(), 
  $resultDates = array())
{
  //  exit when we have collected the required number of business days
  if ($numBusDays === 0) {
    return $resultDates;
  }

  //  add current date to return array, if not a weekend or holiday
  $date = date("w", strtotime($currentDate));
  if ( $date != 0  &&  $date != 6  &&  !in_array($currentDate, $holidays) ) {
    $resultDates[] = $currentDate;
    $numBusDays -= 1;
  }

  //  set up the next date to test
  $currentDate = new DateTime("$currentDate + 1 day");
  $currentDate = $currentDate->format('Y-m-d');

  return getWorkingDays($currentDate, $numBusDays, $holidays, $resultDates);
}

//  test
$days = getWorkingDays('2008-12-05', 4);
print_r($days);

How to delete parent element using jQuery

Simply use the .closest() method: $(this).closest('.li').remove();
It starts with the current element and then climbs up the chain looking for a matching element and stops as soon as it found one.

.parent() only accesses the direct parent of the element, i.e. div.msg-modification which does not match .li. So it never reaches the element you are looking for.

Another solution besides .closest() (which checks the current element and then climbs up the chain) would be using .parents() - however, this would have the caveat that it does not stop as soon as it finds a matching element (and it doesn't check the current element but only parent elements). In your case it doesn't really matter but for what you are trying to do .closest() is the most appropriate method.


Another important thing:

NEVER use the same ID for more than one element. It's not allowed and causes very hard-to-debug problems. Remove the id="191" from the link and, if you need to access the ID in the click handler, use $(this).closest('.li').attr('id'). Actually it would be even cleaner if you used data-id="123" and then .data('id') instead of .attr('id') to access it (so your element ID does not need to resemble whatever ID the (database?) row has)

Remove array element based on object property

Here's another option using jQuery grep. Pass true as the third parameter to ensure grep removes items that match your function.

users = $.grep(users, function(el, idx) {return el.field == "money"}, true)

If you're already using jQuery then no shim is required, which is could be useful as opposed to using Array.filter.

Declaring a python function with an array parameters and passing an array argument to the function call?

Maybe you want unpack elements of array, I don't know if I got it, but below a example:

def my_func(*args):
    for a in args:
        print a

my_func(*[1,2,3,4])
my_list = ['a','b','c']
my_func(*my_list)

Compute a confidence interval from sample data

Here a shortened version of shasan's code, calculating the 95% confidence interval of the mean of array a:

import numpy as np, scipy.stats as st

st.t.interval(0.95, len(a)-1, loc=np.mean(a), scale=st.sem(a))

But using StatsModels' tconfint_mean is arguably even nicer:

import statsmodels.stats.api as sms

sms.DescrStatsW(a).tconfint_mean()

The underlying assumptions for both are that the sample (array a) was drawn independently from a normal distribution with unknown standard deviation (see MathWorld or Wikipedia).

For large sample size n, the sample mean is normally distributed, and one can calculate its confidence interval using st.norm.interval() (as suggested in Jaime's comment). But the above solutions are correct also for small n, where st.norm.interval() gives confidence intervals that are too narrow (i.e., "fake confidence"). See my answer to a similar question for more details (and one of Russ's comments here).

Here an example where the correct options give (essentially) identical confidence intervals:

In [9]: a = range(10,14)

In [10]: mean_confidence_interval(a)
Out[10]: (11.5, 9.4457397432391215, 13.554260256760879)

In [11]: st.t.interval(0.95, len(a)-1, loc=np.mean(a), scale=st.sem(a))
Out[11]: (9.4457397432391215, 13.554260256760879)

In [12]: sms.DescrStatsW(a).tconfint_mean()
Out[12]: (9.4457397432391197, 13.55426025676088)

And finally, the incorrect result using st.norm.interval():

In [13]: st.norm.interval(0.95, loc=np.mean(a), scale=st.sem(a))
Out[13]: (10.23484868811834, 12.76515131188166)

How to delete the last row of data of a pandas dataframe

stats = pd.read_csv("C:\\py\\programs\\second pandas\\ex.csv")

The Output of stats:

       A            B          C
0   0.120064    0.785538    0.465853
1   0.431655    0.436866    0.640136
2   0.445904    0.311565    0.934073
3   0.981609    0.695210    0.911697
4   0.008632    0.629269    0.226454
5   0.577577    0.467475    0.510031
6   0.580909    0.232846    0.271254
7   0.696596    0.362825    0.556433
8   0.738912    0.932779    0.029723
9   0.834706    0.002989    0.333436

just use skipfooter=1

skipfooter : int, default 0

Number of lines at bottom of file to skip

stats_2 = pd.read_csv("C:\\py\\programs\\second pandas\\ex.csv", skipfooter=1, engine='python')

Output of stats_2

       A          B            C
0   0.120064    0.785538    0.465853
1   0.431655    0.436866    0.640136
2   0.445904    0.311565    0.934073
3   0.981609    0.695210    0.911697
4   0.008632    0.629269    0.226454
5   0.577577    0.467475    0.510031
6   0.580909    0.232846    0.271254
7   0.696596    0.362825    0.556433
8   0.738912    0.932779    0.029723

Is it possible to force Excel recognize UTF-8 CSV files automatically?

It is incredible that there are so many answers but none answers the question:

"When I was asking this question, I asked for a way of opening a UTF-8 CSV file in Excel without any problems for a user,..."

The answer marked as the accepted answer with 200+ up-votes is useless for me because I don't want to give my users a manual how to configure Excel. Apart from that: this manual will apply to one Excel version but other Excel versions have different menus and configuration dialogs. You would need a manual for each Excel version.

So the question is how to make Excel show UTF8 data with a simple double click?

Well at least in Excel 2007 this is not possible if you use CSV files because the UTF8 BOM is ignored and you will see only garbage. This is already part of the question of Lyubomyr Shaydariv:

"I also tried specifying UTF-8 BOM EF BB BF, but Excel ignores that."

I make the same experience: Writing russian or greek data into a UTF8 CSV file with BOM results in garbage in Excel:

Content of UTF8 CSV file:

Colum1;Column2
Val1;Val2
?????????;T??????

Result in Excel 2007:

CSV UTF8 Excel

A solution is to not use CSV at all. This format is implemented so stupidly by Microsoft that it depends on the region settings in control panel if comma or semicolon is used as separator. So the same CSV file may open correctly on one computer but on anther computer not. "CSV" means "Comma Separated Values" but for example on a german Windows by default semicolon must be used as separator while comma does not work. (Here it should be named SSV = Semicolon Separated Values) CSV files cannot be interchanged between different language versions of Windows. This is an additional problem to the UTF-8 problem.

Excel exists since decades. It is a shame that Microsoft was not able to implement such a basic thing as CSV import in all these years.


However, if you put the same values into a HTML file and save that file as UTF8 file with BOM with the file extension XLS you will get the correct result.

Content of UTF8 XLS file:

<table>
<tr><td>Colum1</td><td>Column2</td></tr>
<tr><td>Val1</td><td>Val2</td></tr>
<tr><td>?????????</td><td>T??????</td></tr>
</table>

Result in Excel 2007:

UTF8 HTML Excel

You can even use colors in HTML which Excel will show correctly.

<style>
.Head { background-color:gray; color:white; }
.Red  { color:red; }
</style>
<table border=1>
<tr><td class=Head>Colum1</td><td class=Head>Column2</td></tr>
<tr><td>Val1</td><td>Val2</td></tr>
<tr><td class=Red>?????????</td><td class=Red>T??????</td></tr>
</table>

Result in Excel 2007:

UTF8 HTML Excel

In this case only the table itself has a black border and lines. If you want ALL cells to display gridlines this is also possible in HTML:

<html xmlns:x="urn:schemas-microsoft-com:office:excel">
    <head>
        <meta http-equiv="content-type" content="text/plain; charset=UTF-8"/>
        <xml>
            <x:ExcelWorkbook>
                <x:ExcelWorksheets>
                    <x:ExcelWorksheet>
                        <x:Name>MySuperSheet</x:Name>
                        <x:WorksheetOptions>
                            <x:DisplayGridlines/>
                        </x:WorksheetOptions>
                    </x:ExcelWorksheet>
                </x:ExcelWorksheets>
            </x:ExcelWorkbook>
        </xml>
    </head>
    <body>
        <table>
            <tr><td>Colum1</td><td>Column2</td></tr>
            <tr><td>Val1</td><td>Val2</td></tr>
            <tr><td>?????????</td><td>T??????</td></tr>
        </table>
    </body>
</html>

This code even allows to specify the name of the worksheet (here "MySuperSheet")

Result in Excel 2007:

enter image description here

Checking Maven Version

You need to add path to svn.exe file to system environment, variable PATH, after that you can run command mvn from any folder. You can do it from command line(cmd.exe) like this, for example:

set PATH=%PATH%;C:\maven\bin

Or you can got to the folder where mvn.exe is, and run your command there.

And you need not mvn -version, but mvn --version parameter.

Carriage return in C?

Program prints ab, goes back one character and prints si overwriting the b resulting asi. Carriage return returns the caret to the first column of the current line. That means the ha will be printed over as and the result is hai

ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there

I faced the same issue when I uninstalled and reinstalled a different version of 2.7.x of Python on my system using a 32 bit Windows Installer. I got the same error on most of my import statements. I uninstalled the newly installed Python and downloaded a 64 bit Windows installer and reinstalled Python again and it worked. Hope this helps you.

How to disable Excel's automatic cell reference change after copy/paste?

Click on the cell you want to copy. In the formula bar, highlight the formula.

Press Ctrl C.

Press escape (to take you out of actively editing that formula).

Choose new cell. Ctrl V.

Install opencv for Python 3.3

If you're down here... I'm sorry the other options didn't workout. Try this:

conda install -c menpo opencv3

from Step 1 of Scivision's Tutorial. If that doesn't work, then go on to Step 2:

(Windows only) OpenCV 3.2 pip install

Download OpenCV .whl file here. The packages that mention contrib in their name include OpenCV-extra packages. For example, assuming you have Python 3.6, you might download opencv_python-3.2.0+contrib-cp36-none-win_amd64.whl to get the OpenCV-extra packages.

Then, from Command Prompt:

pip install opencv_python-3...yourVersion...win_amd64.whl

Note that the ...win_amd64.whl wheels packages from step 2 in that tutorial are meant for AMD chips.

How do I install the Nuget provider for PowerShell on a unconnected machine so I can install a nuget package from the PS command line?

Although I've tried all the previous answers, only the following one worked out:

1 - Open Powershell (as Admin)

2 - Run:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

3 - Run:

Install-PackageProvider -Name NuGet

The author is Niels Weistra: Microsoft Forum

How do I write a for loop in bash

for ((i = 0 ; i < max ; i++ )); do echo "$i"; done

How to create a scrollable Div Tag Vertically?

This code creates a nice vertical scrollbar for me in Firefox and Chrome:

_x000D_
_x000D_
#answerform {
  position: absolute;
  border: 5px solid gray;
  padding: 5px;
  background: white;
  width: 300px;
  height: 400px;
  overflow-y: scroll;
}
_x000D_
<div id='answerform'>
  badger<br><br>badger<br><br>badger<br><br>badger<br><br>badger<br><br> mushroom
  <br><br>mushroom<br><br> a badger<br><br>badger<br><br>badger<br><br>badger<br><br>badger<br><br>
</div>
_x000D_
_x000D_
_x000D_

Here is a JS fiddle demo proving the above works.

How do you get the current text contents of a QComboBox?

Getting the Text of ComboBox when the item is changed

     self.ui.comboBox.activated.connect(self.pass_Net_Adap)

  def pass_Net_Adap(self):
      print str(self.ui.comboBox.currentText())

What is the correct target for the JAVA_HOME environment variable for a Linux OpenJDK Debian-based distribution?

I've discovered similar problems with the openjdk-6-jre and openjdk-6-jre-headless packages in Ubuntu.

My problem was solved by purging the openjdk-6-jre and openjdk-6-jre-headless packages and re-installing. The alternatives are only updated on a fresh install of the openjdk-6-jre and openjdk-6-jre-headless packages.

Below is a sample of installing after purging:

aptitude purge openjdk-6-jre openjdk-6-jre-headless # to ensure no configuration exists
aptitude install --without-recommends openjdk-6-jre # Installing without some extras
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
The following NEW packages will be installed:
  ca-certificates-java{a} java-common{a} libavahi-client3{a} libavahi-common-data{a} libavahi-common3{a} libcups2{a} libflac8{a} libgif4{a} libnspr4-0d{a} libnss3-1d{a} libogg0{a} libpulse0{a} libsndfile1{a} libvorbis0a{a} libvorbisenc2{a} libxi6{a} libxtst6{a}
  openjdk-6-jre openjdk-6-jre-headless{a} openjdk-6-jre-lib{a} tzdata-java{a}
The following packages are RECOMMENDED but will NOT be installed:
  icedtea-6-jre-cacao icedtea-netx ttf-dejavu-extra
0 packages upgraded, 21 newly installed, 0 to remove and 119 not upgraded.
Need to get 0B/34.5MB of archives. After unpacking 97.6MB will be used.
Do you want to continue? [Y/n/?]
Writing extended state information... Done
Selecting previously deselected package openjdk-6-jre-lib.
(Reading database ... 62267 files and directories currently installed.)
Unpacking openjdk-6-jre-lib (from .../openjdk-6-jre-lib_6b24-1.11.5-0ubuntu1~10.04.2_all.deb) ...
...
Processing triggers for man-db ...
Setting up tzdata-java (2012e-0ubuntu0.10.04) ...
...
Setting up openjdk-6-jre-headless (6b24-1.11.5-0ubuntu1~10.04.2) ...
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/java to provide /usr/bin/java (java) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/keytool to provide /usr/bin/keytool (keytool) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/pack200 to provide /usr/bin/pack200 (pack200) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/rmid to provide /usr/bin/rmid (rmid) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/rmiregistry to provide /usr/bin/rmiregistry (rmiregistry) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/unpack200 to provide /usr/bin/unpack200 (unpack200) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/orbd to provide /usr/bin/orbd (orbd) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/servertool to provide /usr/bin/servertool (servertool) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/tnameserv to provide /usr/bin/tnameserv (tnameserv) in auto mode.
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/lib/jexec to provide /usr/bin/jexec (jexec) in auto mode.
Setting up openjdk-6-jre (6b24-1.11.5-0ubuntu1~10.04.2) ...
update-alternatives: using /usr/lib/jvm/java-6-openjdk/jre/bin/policytool to provide /usr/bin/policytool (policytool) in auto mode.
...

You can see above that update-alternatives is run to set up links for the various Java binaries.

After this install, there are also links in /usr/bin, links in /etc/alternatives, and files for each binary in /var/lib/dpkg/alternatives.

ls -l /usr/bin/java /etc/alternatives/java /var/lib/dpkg/alternatives/java
lrwxrwxrwx 1 root root  40 2013-01-16 14:44 /etc/alternatives/java -> /usr/lib/jvm/java-6-openjdk/jre/bin/java
lrwxrwxrwx 1 root root  22 2013-01-16 14:44 /usr/bin/java -> /etc/alternatives/java
-rw-r--r-- 1 root root 158 2013-01-16 14:44 /var/lib/dpkg/alternatives/java

Let's contast this with installing without purging.

aptitude remove openjdk-6-jre
aptitude install --without-recommends openjdk-6-jre
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
The following NEW packages will be installed:
  ca-certificates-java{a} java-common{a} libavahi-client3{a} libavahi-common-data{a} libavahi-common3{a} libcups2{a} libflac8{a} libgif4{a} libnspr4-0d{a} libnss3-1d{a} libogg0{a} libpulse0{a} libsndfile1{a} libvorbis0a{a} libvorbisenc2{a} libxi6{a} libxtst6{a}
  openjdk-6-jre openjdk-6-jre-headless{a} openjdk-6-jre-lib{a} tzdata-java{a}
The following packages are RECOMMENDED but will NOT be installed:
  icedtea-6-jre-cacao icedtea-netx ttf-dejavu-extra
0 packages upgraded, 21 newly installed, 0 to remove and 119 not upgraded.
Need to get 0B/34.5MB of archives. After unpacking 97.6MB will be used.
Do you want to continue? [Y/n/?]
Writing extended state information... Done
Selecting previously deselected package openjdk-6-jre-lib.
(Reading database ... 62293 files and directories currently installed.)
Unpacking openjdk-6-jre-lib (from .../openjdk-6-jre-lib_6b24-1.11.5-0ubuntu1~10.04.2_all.deb) ...
...
Processing triggers for man-db ...
...
Setting up openjdk-6-jre-headless (6b24-1.11.5-0ubuntu1~10.04.2) ...

Setting up openjdk-6-jre (6b24-1.11.5-0ubuntu1~10.04.2) ...
...

As you see, update-alternatives is not triggered.

After this install, there are no files for the Java binaries in /var/lib/dpkg/alternatives, no links in /etc/alternatives, and no links in /usr/bin.

The removal of the files in /var/lib/dpkg/alternatives also breaks update-java-alternatives.

comparing elements of the same array in java

Try this or purpose will solve with lesser no of steps

for (int i = 0; i < a.length; i++) 
{
    for (int k = i+1; k < a.length; k++) 
    {
        if (a[i] != a[k]) 
         {
            System.out.println(a[i]+"not the same with"+a[k]+"\n");
        }
    }
}

video as site background? HTML 5

Take a look at my jquery videoBG plugin

http://syddev.com/jquery.videoBG/

Make any HTML5 video a site background... has an image fallback for browsers that don't support html5

Really easy to use

Let me know if you need any help.

Access parent's parent from javascript object

In this case, you could use life to reference the parent object. Or you could store a reference to life in the users object. There can't be a fixed parent available to you in the language, because users is just a reference to an object, and there could be other references...

var death = { residents : life.users };
life.users.smallFurryCreaturesFromAlphaCentauri = { exist : function() {} };
// death.residents.smallFurryCreaturesFromAlphaCentauri now exists
//  - because life.users references the same object as death.residents!

You might find it helpful to use something like this:

function addChild(ob, childName, childOb)
{
   ob[childName] = childOb;
   childOb.parent = ob;
}

var life= {
        mameAndDestroy : function(group){ },
        kiss : function(group){ }
};

addChild(life, 'users', {
   guys : function(){ this.parent.mameAndDestroy(this.girls); },
   girls : function(){ this.parent.kiss(this.boys); },
   });

// life.users.parent now exists and points to life

How do I measure a time interval in C?

Using the time.h library, try something like this:

long start_time, end_time, elapsed;

start_time = clock();
// Do something
end_time = clock();

elapsed = (end_time - start_time) / CLOCKS_PER_SEC * 1000;

how to store Image as blob in Sqlite & how to retrieve it?

you may also want to encode and decode to/from base64

    function uncompress(str:String):ByteArray {
            import mx.utils.Base64Decoder;
            var dec:Base64Decoder = new Base64Decoder();
            dec.decode(str);
            var newByteArr:ByteArray=dec.toByteArray();        
            return newByteArr;
        }


    // Compress a ByteArray into a Base64 String.
    function compress(bytes:ByteArray):String { 
        import mx.utils.Base64Decoder; //Transform String in a ByteArray.
        import mx.utils.Base64Encoder; //Transform ByteArray in a readable string.
        var enc:Base64Encoder = new Base64Encoder();    
        enc.encodeBytes(bytes);
        return enc.drain().split("\n").join("");
    }

Setting Authorization Header of HttpClient

BaseWebApi.cs

public abstract class BaseWebApi
{
    //Inject HttpClient from Ninject
    private readonly HttpClient _httpClient;
    public BaseWebApi(HttpClient httpclient)
    {
        _httpClient = httpClient;
    }

    public async Task<TOut> PostAsync<TOut>(string method, object param, Dictionary<string, string> headers, HttpMethod httpMethod)
    {
        //Set url

        HttpResponseMessage response;
        using (var request = new HttpRequestMessage(httpMethod, url))
        {
            AddBody(param, request);
            AddHeaders(request, headers);
            response = await _httpClient.SendAsync(request, cancellationToken);
        }

        if(response.IsSuccessStatusCode)
        {
             return await response.Content.ReadAsAsync<TOut>();
        }
        //Exception handling
    }

    private void AddHeaders(HttpRequestMessage request, Dictionary<string, string> headers)
    {
        request.Headers.Accept.Clear();
        request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        if (headers == null) return;

        foreach (var header in headers)
        {
            request.Headers.Add(header.Key, header.Value);
        }
    }

    private static void AddBody(object param, HttpRequestMessage request)
    {
        if (param != null)
        {
            var content = JsonConvert.SerializeObject(param);
            request.Content = new StringContent(content);
            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        }
    }

SubWebApi.cs

public sealed class SubWebApi : BaseWebApi
{
    public SubWebApi(HttpClient httpClient) : base(httpClient) {}

    public async Task<StuffResponse> GetStuffAsync(int cvr)
    {
        var method = "get/stuff";
        var request = new StuffRequest 
        {
            query = "GiveMeStuff"
        }
        return await PostAsync<StuffResponse>(method, request, GetHeaders(), HttpMethod.Post);
    }
    private Dictionary<string, string> GetHeaders()
    {
        var headers = new Dictionary<string, string>();
        var basicAuth = GetBasicAuth();
        headers.Add("Authorization", basicAuth);
        return headers;
    }

    private string GetBasicAuth()
    {
        var byteArray = Encoding.ASCII.GetBytes($"{SystemSettings.Username}:{SystemSettings.Password}");
        var authString = Convert.ToBase64String(byteArray);
        return $"Basic {authString}";
    }
}

Could not execute menu item (internal error)[Exception] - When changing PHP version from 5.3.1 to 5.2.9

Maybe an old version of the service was not uninstalled from windows

  1. uninstall the old version running this command line

    sc delete wampapache

  2. Reinstall the service from wamp:

    Wamp Tray Icon -> Apache -> Service -> Install Service

It works for me, enjoy!

Mockito : how to verify method was called on an object created within a method?

Solution for your example code using PowerMockito.whenNew

  • mockito-all 1.10.8
  • powermock-core 1.6.1
  • powermock-module-junit4 1.6.1
  • powermock-api-mockito 1.6.1
  • junit 4.12

FooTest.java

package foo;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

//Both @PrepareForTest and @RunWith are needed for `whenNew` to work 
@RunWith(PowerMockRunner.class)
@PrepareForTest({ Foo.class })
public class FooTest {

    // Class Under Test
    Foo cut;

    @Mock
    Bar barMock;

    @Before
    public void setUp() throws Exception {
        cut = new Foo();

    }

    @After
    public void tearDown() {
        cut = null;

    }

    @Test
    public void testFoo() throws Exception {

        // Setup
        PowerMockito.whenNew(Bar.class).withNoArguments()
                .thenReturn(this.barMock);

        // Test
        cut.foo();

        // Validations
        Mockito.verify(this.barMock, Mockito.times(1)).someMethod();

    }

}

JUnit Output JUnit Output

Setting default values to null fields when mapping with Jackson

Looks like the solution is to set the value of the properties inside the default constructor. So in this case the java class is:

class JavaObject {

    public JavaObject() {

        optionalMember = "Value";
    }

    @NotNull
    public String notNullMember;

    public String optionalMember;
}

After the mapping with Jackson, if the optionalMember is missing from the JSON its value in the Java class is "Value".

However, I am still interested to know if there is a solution with annotations and without the default constructor.

Giving a border to an HTML table row, <tr>

_x000D_
_x000D_
<table cellpadding="0" cellspacing="0" width="100%" style="border: 1px;" rules="none">_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <th style="width: 96px;">Column 1</th>_x000D_
            <th style="width: 96px;">Column 2</th>_x000D_
            <th style="width: 96px;">Column 3</th>_x000D_
        </tr>_x000D_
_x000D_
        <tr>_x000D_
            <td>&nbsp;</td>_x000D_
            <td>&nbsp;</td>_x000D_
            <td>&nbsp;</td>_x000D_
        </tr>_x000D_
_x000D_
        <tr>_x000D_
            <td style="border-left: thin solid; border-top: thin solid; border-bottom: thin solid;">&nbsp;</td>_x000D_
            <td style="border-top: thin solid; border-bottom: thin solid;">&nbsp;</td>_x000D_
            <td style="border-top: thin solid; border-bottom: thin solid; border-right: thin solid;">&nbsp;</td>_x000D_
        </tr>_x000D_
_x000D_
        <tr>_x000D_
            <td>&nbsp;</td>_x000D_
            <td>&nbsp;</td>_x000D_
            <td>&nbsp;</td>_x000D_
        </tr>_x000D_
    </tbody>_x000D_
</table>
_x000D_
_x000D_
_x000D_

How does Tomcat find the HOME PAGE of my Web App?

I already had index.html in the WebContent folder but it was not showing up , finally i added the following piece of code in my projects web.xml and it started showing up

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping> 

entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding related objects to entity in Entity Framework 4.1

Error source:

ApplicationUser user = await UserManager.FindByIdAsync(User.Identity.Name);
ApplicationDbContext db = new ApplicationDbContent();
db.Users.Uploads.Add(new MyUpload{FileName="newfile.png"});
await db.SavechangesAsync();/ZZZZZZZ

Hope someone saves some precious time

Where is the Global.asax.cs file?

It don't create normally; you need to add it by yourself.

After adding Global.asax by

  • Right clicking your website -> Add New Item -> Global Application Class -> Add

You need to add a class

  • Right clicking App_Code -> Add New Item -> Class -> name it Global.cs -> Add

Inherit the newly generated by System.Web.HttpApplication and copy all the method created Global.asax to Global.cs and also add an inherit attribute to the Global.asax file.

Your Global.asax will look like this: -

<%@ Application Language="C#" Inherits="Global" %>

Your Global.cs in App_Code will look like this: -

public class Global : System.Web.HttpApplication
{
    public Global()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup

    }
    /// Many other events like begin request...e.t.c, e.t.c
}

Correctly Parsing JSON in Swift 3

The problem is with the API interaction method. The JSON parsing is changed only in syntax. The main problem is with the way of fetching data. What you are using is a synchronous way of getting data. This doesn't work in every case. What you should be using is an asynchronous way to fetch data. In this way, you have to request data through the API and wait for it to respond with data. You can achieve this with URL session and third party libraries like Alamofire. Below is the code for URL Session method.

let urlString = "https://api.forecast.io/forecast/apiKey/37.5673776,122.048951"
let url = URL.init(string: urlString)
URLSession.shared.dataTask(with:url!) { (data, response, error) in
    guard error == nil else {
        print(error)
    }
    do {
        let Data = try JSONSerialization.jsonObject(with: data!) as! [String:Any]
        // Note if your data is coming in Array you should be using [Any]()
        //Now your data is parsed in Data variable and you can use it normally
        let currentConditions = Data["currently"] as! [String:Any]
        print(currentConditions)
        let currentTemperatureF = currentConditions["temperature"] as! Double
        print(currentTemperatureF)
    } catch let error as NSError {
        print(error)
    }
}.resume()

psql: FATAL: database "<user>" does not exist

By default, postgres tries to connect to a database with the same name as your user. To prevent this default behaviour, just specify user and database:

psql -U Username DatabaseName 

Send value of submit button when form gets posted

Use this instead:

<input id='tea-submit' type='submit' name = 'submit'    value = 'Tea'>
<input id='coffee-submit' type='submit' name = 'submit' value = 'Coffee'>

Using Excel as front end to Access database (with VBA)

I'm sure you'll get a ton of "don't do this" answers, and I must say, there is good reason. This isn't an ideal solution....

That being said, I've gone down this road (and similar ones) before, mostly because the job specified it as a hard requirement and I couldn't talk around it.

Here are a few things to consider with this:

How easy is it to link to Access from Excel using ADO / DAO? Is it quite limited in terms of functionality or can I get creative?

It's fairly straitforward. You're more limited than you would be doing things using other tools, since VBA and Excel forms is a bit more limiting than most full programming languages, but there isn't anything that will be a show stopper. It works - sometimes its a bit ugly, but it does work. In my last company, I often had to do this - and occasionally was pulling data from Access and Oracle via VBA in Excel.

Do I pay a performance penalty (vs.using forms in Access as the UI)?

My experience is that there is definitely a perf. penalty in doing this. I never cared (in my use case, things were small enough that it was reasonable), but going Excel<->Access is a lot slower than just working in Access directly. Part of it depends on what you want to do....

In my case, the thing that seemed to be the absolute slowest (and most painful) was trying to fill in Excel spreadsheets based on Access data. This wasn't fun, and was often very slow. If you have to go down this road, make sure to do everything with Excel hidden/invisible, or the redrawing will absolutely kill you.

Assuming that the database will always be updated using ADO / DAO commands from within Excel VBA, does that mean I can have multiple Excel users using that one single Access database and not run into any concurrency issues etc.?

You're pretty much using Excel as a client - the same way you would use a WinForms application or any other tool. The ADO/DAO clients for Access are pretty good, so you probably won't run into any concurrency issues.

That being said, Access does NOT scale well. This works great if you have 2 or 3 (or even 10) users. If you are going to have 100, you'll probably run into problems. Also, I tended to find that Access needed regular maintenance in order to not have corruption issues. Regular backups of the Access DB are a must. Compacting the access database on a regular basis will help prevent database corruption, in my experience.

Any other things I should be aware of?

You're doing this the hard way. Using Excel to hit Access is going to be a lot more work than just using Access directly.

I'd recommend looking into the Access VBA API - most of it is the same as Excel, so you'll have a small learning curve. The parts that are different just make this easier. You'll also have all of the advantages of Access reporting and Forms, which are much more data-oriented than the ones in Excel. The reporting can be great for things like this, and having the Macros and Reports will make life easier in the long run. If the user's going to be using forms to manage everything, doing the forms in Access will be very, very similar to doing them in Excel, and will look nearly identical, but will make everything faster and smoother.

How to find if directory exists in Python

Just to provide the os.stat version (python 2):

import os, stat, errno
def CheckIsDir(directory):
  try:
    return stat.S_ISDIR(os.stat(directory).st_mode)
  except OSError, e:
    if e.errno == errno.ENOENT:
      return False
    raise

Removing duplicate objects with Underscore for Javascript

If you're looking to remove duplicates based on an id you could do something like this:

var res = [
  {id: 1, content: 'heeey'},
  {id: 2, content: 'woah'}, 
  {id: 1, content:'foo'},
  {id: 1, content: 'heeey'},
];
var uniques = _.map(_.groupBy(res,function(doc){
  return doc.id;
}),function(grouped){
  return grouped[0];
});

//uniques
//[{id: 1, content: 'heeey'},{id: 2, content: 'woah'}]

AngularJS Folder Structure

I like this entry about angularjs structure

It's written by one of the angularjs developers, so should give you a good insight

Here's an excerpt:

root-app-folder
+-- index.html
+-- scripts
¦   +-- controllers
¦   ¦   +-- main.js
¦   ¦   +-- ...
¦   +-- directives
¦   ¦   +-- myDirective.js
¦   ¦   +-- ...
¦   +-- filters
¦   ¦   +-- myFilter.js
¦   ¦   +-- ...
¦   +-- services
¦   ¦   +-- myService.js
¦   ¦   +-- ...
¦   +-- vendor
¦   ¦   +-- angular.js
¦   ¦   +-- angular.min.js
¦   ¦   +-- es5-shim.min.js
¦   ¦   +-- json3.min.js
¦   +-- app.js
+-- styles
¦   +-- ...
+-- views
    +-- main.html
    +-- ...

How to copy from CSV file to PostgreSQL table with headers in CSV file?

I have been using this function for a while with no problems. You just need to provide the number columns there are in the csv file, and it will take the header names from the first row and create the table for you:

create or replace function data.load_csv_file
    (
        target_table  text, -- name of the table that will be created
        csv_file_path text,
        col_count     integer
    )

    returns void

as $$

declare
    iter      integer; -- dummy integer to iterate columns with
    col       text; -- to keep column names in each iteration
    col_first text; -- first column name, e.g., top left corner on a csv file or spreadsheet

begin
    set schema 'data';

    create table temp_table ();

    -- add just enough number of columns
    for iter in 1..col_count
    loop
        execute format ('alter table temp_table add column col_%s text;', iter);
    end loop;

    -- copy the data from csv file
    execute format ('copy temp_table from %L with delimiter '','' quote ''"'' csv ', csv_file_path);

    iter := 1;
    col_first := (select col_1
                  from temp_table
                  limit 1);

    -- update the column names based on the first row which has the column names
    for col in execute format ('select unnest(string_to_array(trim(temp_table::text, ''()''), '','')) from temp_table where col_1 = %L', col_first)
    loop
        execute format ('alter table temp_table rename column col_%s to %s', iter, col);
        iter := iter + 1;
    end loop;

    -- delete the columns row // using quote_ident or %I does not work here!?
    execute format ('delete from temp_table where %s = %L', col_first, col_first);

    -- change the temp table name to the name given as parameter, if not blank
    if length (target_table) > 0 then
        execute format ('alter table temp_table rename to %I', target_table);
    end if;
end;

$$ language plpgsql;

How to search JSON tree with jQuery

    var GDNUtils = {};

GDNUtils.loadJquery = function () {
    var checkjquery = window.jQuery && jQuery.fn && /^1\.[3-9]/.test(jQuery.fn.jquery);
    if (!checkjquery) {

        var theNewScript = document.createElement("script");
        theNewScript.type = "text/javascript";
        theNewScript.src = "http://code.jquery.com/jquery.min.js";

        document.getElementsByTagName("head")[0].appendChild(theNewScript);

        // jQuery MAY OR MAY NOT be loaded at this stage


    }
};



GDNUtils.searchJsonValue = function (jsonData, keytoSearch, valuetoSearch, keytoGet) {
    GDNUtils.loadJquery();
    alert('here' + jsonData.length.toString());
    GDNUtils.loadJquery();

    $.each(jsonData, function (i, v) {

        if (v[keytoSearch] == valuetoSearch) {
            alert(v[keytoGet].toString());

            return;
        }
    });



};




GDNUtils.searchJson = function (jsonData, keytoSearch, valuetoSearch) {
    GDNUtils.loadJquery();
    alert('here' + jsonData.length.toString());
    GDNUtils.loadJquery();
    var row;
    $.each(jsonData, function (i, v) {

        if (v[keytoSearch] == valuetoSearch) {


            row  = v;
        }
    });

    return row;



}

Java: How to check if object is null?

Edited Java 8 Solution:

final Drawable drawable = 
    Optional.ofNullable(Common.getDrawableFromUrl(this, product.getMapPath()))
        .orElseGet(() -> getRandomDrawable());

You can declare drawable final in this case.

As Chasmo pointed out, Android doesn't support Java 8 at the moment. So this solution is only possible in other contexts.

How to search in a List of Java object

As your list is an ArrayList, it can be assumed that it is unsorted. Therefore, there is no way to search for your element that is faster than O(n).

If you can, you should think about changing your list into a Set (with HashSet as implementation) with a specific Comparator for your sample class.

Another possibility would be to use a HashMap. You can add your data as Sample (please start class names with an uppercase letter) and use the string you want to search for as key. Then you could simply use

Sample samp = myMap.get(myKey);

If there can be multiple samples per key, use Map<String, List<Sample>>, otherwise use Map<String, Sample>. If you use multiple keys, you will have to create multiple maps that hold the same dataset. As they all point to the same objects, space shouldn't be that much of a problem.

Push origin master error on new repository

The error message leads to the conclusion that you do not have a master branch in your local repository. Either push your main development branch (git push origin my-local-master:master which will rename it to master on github) or make a commit first. You can not push a completely empty repository.

@try - catch block in Objective-C

All work perfectly :)

 NSString *test = @"test";
 unichar a;
 int index = 5;
    
 @try {
    a = [test characterAtIndex:index];
 }
 @catch (NSException *exception) {
    NSLog(@"%@", exception.reason);
    NSLog(@"Char at index %d cannot be found", index);
    NSLog(@"Max index is: %lu", [test length] - 1);
 }
 @finally {
    NSLog(@"Finally condition");
 }

Log:

[__NSCFConstantString characterAtIndex:]: Range or index out of bounds

Char at index 5 cannot be found

Max index is: 3

Finally condition

pandas get rows which are NOT in other dataframe

One method would be to store the result of an inner merge form both dfs, then we can simply select the rows when one column's values are not in this common:

In [119]:

common = df1.merge(df2,on=['col1','col2'])
print(common)
df1[(~df1.col1.isin(common.col1))&(~df1.col2.isin(common.col2))]
   col1  col2
0     1    10
1     2    11
2     3    12
Out[119]:
   col1  col2
3     4    13
4     5    14

EDIT

Another method as you've found is to use isin which will produce NaN rows which you can drop:

In [138]:

df1[~df1.isin(df2)].dropna()
Out[138]:
   col1  col2
3     4    13
4     5    14

However if df2 does not start rows in the same manner then this won't work:

df2 = pd.DataFrame(data = {'col1' : [2, 3,4], 'col2' : [11, 12,13]})

will produce the entire df:

In [140]:

df1[~df1.isin(df2)].dropna()
Out[140]:
   col1  col2
0     1    10
1     2    11
2     3    12
3     4    13
4     5    14

How to use underscore.js as a template engine?

<!-- Install jQuery and underscore -->

<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="http://documentcloud.github.com/underscore/underscore-min.js"></script>

<!-- Create your template -->
<script type="foo/bar" id='usageList'>
<table cellspacing='0' cellpadding='0' border='1' >
    <thead>
      <tr>
        <th>Id</th>
        <th>Name</th>
      </tr>
    </thead>
    <tbody>
      <%
        // repeat items 
        _.each(items,function(item,key,list){
          // create variables
          var f = item.name.split("").shift().toLowerCase();
      %>
        <tr>
          <!-- use variables -->
          <td><%= key %></td>
          <td class="<%= f %>">
            <!-- use %- to inject un-sanitized user input (see 'Demo of XSS hack') -->
            <h3><%- item.name %></h3>
            <p><%- item.interests %></p>
          </td>
        </tr>
      <%
        });
      %>
    </tbody>
  </table>
</script>

<!-- Create your target -->

<div id="target"></div>

<!-- Write some code to fetch the data and apply template -->

<script type="text/javascript">
  var items = [
    {name:"Alexander", interests:"creating large empires"},
    {name:"Edward", interests:"ha.ckers.org <\nBGSOUND SRC=\"javascript:alert('XSS');\">"},
    {name:"..."},
    {name:"Yolando", interests:"working out"},
    {name:"Zachary", interests:"picking flowers for Angela"}
  ];
  var template = $("#usageList").html();
  $("#target").html(_.template(template,{items:items}));
</script>
  • JsFiddle Thanks @PHearst!
  • JsFiddle (latest)
  • JsFiddle List grouped by first letter (complex example w/ images, function calls, sub-templates) fork it! have a blast...
  • JsFiddle Demo of XSS hack noted by @tarun_telang below
  • JsFiddle One non-standard method to do sub-templates

How to submit a form using Enter key in react.js?

I've built up on @user1032613's answer and on this answer and created a "on press enter click element with querystring" hook. enjoy!

const { useEffect } = require("react");

const useEnterKeyListener = ({ querySelectorToExecuteClick }) => {
    useEffect(() => {
        //https://stackoverflow.com/a/59147255/828184
        const listener = (event) => {
            if (event.code === "Enter" || event.code === "NumpadEnter") {
                handlePressEnter();
            }
        };

        document.addEventListener("keydown", listener);

        return () => {
            document.removeEventListener("keydown", listener);
        };
    }, []);

    const handlePressEnter = () => {
        //https://stackoverflow.com/a/54316368/828184
        const mouseClickEvents = ["mousedown", "click", "mouseup"];
        function simulateMouseClick(element) {
            mouseClickEvents.forEach((mouseEventType) =>
                element.dispatchEvent(
                    new MouseEvent(mouseEventType, {
                        view: window,
                        bubbles: true,
                        cancelable: true,
                        buttons: 1,
                    })
                )
            );
        }

        var element = document.querySelector(querySelectorToExecuteClick);
        simulateMouseClick(element);
    };
};

export default useEnterKeyListener;

This is how you use it:

useEnterKeyListener({
    querySelectorToExecuteClick: "#submitButton",
});

https://codesandbox.io/s/useenterkeylistener-fxyvl?file=/src/App.js:399-407

How to download and save an image in Android

@Droidman post is pretty comprehensive. Volley works good with small data of few kbytes. When I tried to use the 'BasicImageDownloader.java' the Android Studio gave me warning that the AsyncTask class should to be static or there could be leaks. I used Volley in another test app and that kept crashing because of leaks so I am worried about using Volley for the image downloader (images can be few 100 kB).

I used Picasso and it worked well, there is small change (probably an update on Picasso) from what is posted above. Below code worked for me:

    public static void imageDownload(Context ctx, String url){
    Picasso.get().load(yourURL)
            .into(getTarget(url));
}
private static Target getTarget(final String url){

    Target target2 = new Target() {
        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
            new Thread(new Runnable() {

                @Override
                public void run() {

                    File file = new File(localPath + "/"+"YourImageFile.jpg");
                    try {
                        file.createNewFile();
                        FileOutputStream ostream = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 80, ostream);
                        ostream.flush();
                        ostream.close();
                    } catch (IOException e) {
                        Log.e("IOException", e.getLocalizedMessage());
                    }
                }
            }).start();
        }

        @Override
        public void onBitmapFailed(Exception e, Drawable errorDrawable) {
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {
        }
    };
    return target;
}

How to Allow Remote Access to PostgreSQL database

After set listen_addresses = '*' in postgresql.conf

Edit the pg_hba.conf file and add the following entry at the very end of file:

host    all             all              0.0.0.0/0                       md5
host    all             all              ::/0                            md5

For finding the config files this link might help you.

How can I access localhost from another computer in the same network?

You need to find what your local network's IP of that computer is. Then other people can access to your site by that IP.

You can find your local network's IP by go to Command Prompt or press Windows + R then type in ipconfig. It will give out some information and your local IP should look like 192.168.1.x.

How can I get onclick event on webview in android?

This works for me

webView.setOnTouchListener(new View.OnTouchListener() {
                            @Override
                            public boolean onTouch(View v, MotionEvent event) {
                                // Do what you want
                                return false;
                            }
                        });

How to find GCD, LCM on a set of numbers

for gcd you cad do as below:

    String[] ss = new Scanner(System.in).nextLine().split("\\s+");
    BigInteger bi,bi2 = null;
    bi2 = new BigInteger(ss[1]);
    for(int i = 0 ; i<ss.length-1 ; i+=2 )
    {
        bi = new BigInteger(ss[i]);
        bi2 = bi.gcd(bi2);
    }
    System.out.println(bi2.toString());

pandas dataframe create new columns and fill with calculated values from same df

In [56]: df = pd.DataFrame(np.abs(randn(3, 4)), index=[1,2,3], columns=['A','B','C','D'])

In [57]: df.divide(df.sum(axis=1), axis=0)
Out[57]: 
          A         B         C         D
1  0.319124  0.296653  0.138206  0.246017
2  0.376994  0.326481  0.230464  0.066062
3  0.036134  0.192954  0.430341  0.340571

Different class for the last element in ng-repeat

The answer given by Fabian Perez worked for me, with a little change

Edited html is here:

<div ng-repeat="file in files" ng-class="!$last ? 'other' : 'class-for-last'"> {{file.name}} </div>

Instagram API - How can I retrieve the list of people a user is following on Instagram

I made my own way based on Caitlin Morris's answer for fetching all folowers and followings on Instagram. Just copy this code, paste in browser console and wait for a few seconds.

You need to use browser console from instagram.com tab to make it works.

let username = 'USERNAME'
let followers = [], followings = []
try {
  let res = await fetch(`https://www.instagram.com/${username}/?__a=1`)

  res = await res.json()
  let userId = res.graphql.user.id

  let after = null, has_next = true
  while (has_next) {
    await fetch(`https://www.instagram.com/graphql/query/?query_hash=c76146de99bb02f6415203be841dd25a&variables=` + encodeURIComponent(JSON.stringify({
      id: userId,
      include_reel: true,
      fetch_mutual: true,
      first: 50,
      after: after
    }))).then(res => res.json()).then(res => {
      has_next = res.data.user.edge_followed_by.page_info.has_next_page
      after = res.data.user.edge_followed_by.page_info.end_cursor
      followers = followers.concat(res.data.user.edge_followed_by.edges.map(({node}) => {
        return {
          username: node.username,
          full_name: node.full_name
        }
      }))
    })
  }
  console.log('Followers', followers)

  has_next = true
  after = null
  while (has_next) {
    await fetch(`https://www.instagram.com/graphql/query/?query_hash=d04b0a864b4b54837c0d870b0e77e076&variables=` + encodeURIComponent(JSON.stringify({
      id: userId,
      include_reel: true,
      fetch_mutual: true,
      first: 50,
      after: after
    }))).then(res => res.json()).then(res => {
      has_next = res.data.user.edge_follow.page_info.has_next_page
      after = res.data.user.edge_follow.page_info.end_cursor
      followings = followings.concat(res.data.user.edge_follow.edges.map(({node}) => {
        return {
          username: node.username,
          full_name: node.full_name
        }
      }))
    })
  }
  console.log('Followings', followings)
} catch (err) {
  console.log('Invalid username')
}

How to use ConcurrentLinkedQueue?

Just use it as you would a non-concurrent collection. The Concurrent[Collection] classes wrap the regular collections so that you don't have to think about synchronizing access.

Edit: ConcurrentLinkedList isn't actually just a wrapper, but rather a better concurrent implementation. Either way, you don't have to worry about synchronization.

Combine two columns and add into one new column

You don't need to store the column to reference it that way. Try this:

To set up:

CREATE TABLE tbl
  (zipcode text NOT NULL, city text NOT NULL, state text NOT NULL);
INSERT INTO tbl VALUES ('10954', 'Nanuet', 'NY');

We can see we have "the right stuff":

\pset border 2
SELECT * FROM tbl;
+---------+--------+-------+
| zipcode |  city  | state |
+---------+--------+-------+
| 10954   | Nanuet | NY    |
+---------+--------+-------+

Now add a function with the desired "column name" which takes the record type of the table as its only parameter:

CREATE FUNCTION combined(rec tbl)
  RETURNS text
  LANGUAGE SQL
AS $$
  SELECT $1.zipcode || ' - ' || $1.city || ', ' || $1.state;
$$;

This creates a function which can be used as if it were a column of the table, as long as the table name or alias is specified, like this:

SELECT *, tbl.combined FROM tbl;

Which displays like this:

+---------+--------+-------+--------------------+
| zipcode |  city  | state |      combined      |
+---------+--------+-------+--------------------+
| 10954   | Nanuet | NY    | 10954 - Nanuet, NY |
+---------+--------+-------+--------------------+

This works because PostgreSQL checks first for an actual column, but if one is not found, and the identifier is qualified with a relation name or alias, it looks for a function like the above, and runs it with the row as its argument, returning the result as if it were a column. You can even index on such a "generated column" if you want to do so.

Because you're not using extra space in each row for the duplicated data, or firing triggers on all inserts and updates, this can often be faster than the alternatives.

Eclipse: Enable autocomplete / content assist

By default in Eclipse you only have to press Ctrl-space for autocomplete. Then select the desired method and wait 500ms for the javadoc info to pop up. If this doesn't work go to the Eclipse Windows menu -> Preferences -> Java -> Editor -> Content assist and check your settings here

Trying to get PyCharm to work, keep getting "No Python interpreter selected"

Go to File->Settings->Project Settings->Project Interpreter->Python Interpreters

There will be a "+" sign on the right side. Navigate to your python binary, PyCharm will figure out the rest.

How to check for a Null value in VB.NET

If you are using a strongly-typed dataset then you should do this:

If Not ediTransactionRow.Ispay_id1Null Then
    'Do processing here
End If

You are getting the error because a strongly-typed data set retrieves the underlying value and exposes the conversion through the property. For instance, here is essentially what is happening:

Public Property pay_Id1 Then
   Get
     return DirectCast(me.GetValue("pay_Id1", short)
   End Get
   'Abbreviated for clarity
End Property

The GetValue method is returning DBNull which cannot be converted to a short.

How can I see an the output of my C programs using Dev-C++?

; It works...

#include <iostream>
using namespace std;
int main ()
{
   int x,y; // (Or whatever variable you want you can)

your required process syntax type here then;

   cout << result 

(or your required output result statement); use without space in getchar and other syntax.

   getchar();
}

Now you can save your file with .cpp extension and use ctrl + f 9 to compile and then use ctrl + f 10 to execute the program. It will show you the output window and it will not vanish with a second Until you click enter to close the output window.

How to comment out a block of code in Python

Use a nice editor like SciTe, select your code, press Ctrl + Q and done.

If you don't have an editor that supports block comments you can use a triple quoted string at the start and the end of your code block to 'effectively' comment it out. It is not the best practice though.

Remove All Event Listeners of Specific Type

So this function gets rid of most of a specified listener type on an element:

function removeListenersFromElement(element, listenerType){
  const listeners = getEventListeners(element)[listenerType];
  let l = listeners.length;
  for(let i = l-1; i >=0; i--){
    removeEventListener(listenerType, listeners[i].listener);
  }
 }

There have been a few rare exceptions where one can't be removed for some reason.

How to redirect output of systemd service to a file

You possibly get this error:

Failed to parse output specifier, ignoring: /var/log1.log

From the systemd.exec(5) man page:

StandardOutput=

Controls where file descriptor 1 (STDOUT) of the executed processes is connected to. Takes one of inherit, null, tty, journal, syslog, kmsg, journal+console, syslog+console, kmsg+console or socket.

The systemd.exec(5) man page explains other options related to logging. See also the systemd.service(5) and systemd.unit(5) man pages.

Or maybe you can try things like this (all on one line):

ExecStart=/bin/sh -c '/usr/local/bin/binary1 agent -config-dir /etc/sample.d/server 2>&1 > /var/log.log' 

Increasing Google Chrome's max-connections-per-server limit to more than 6

There doesn't appear to be an external way to hack the behaviour of the executables.

You could modify the Chrome(ium) executables as this information is obviously compiled in. That approach brings a lot of problems with support and automatic upgrades so you probably want to avoid doing that. You also need to understand how to make the changes to the binaries which is not something most people can pick up in a few days.

If you compile your own browser you are creating a support issue for yourself as you are stuck with a specific revision. If you want to get new features and bug fixes you will have to recompile. All of this involves tracking Chrome development for bugs and build breakages - not something that a web developer should have to do.

I'd follow @BenSwayne's advice for now, but it might be worth thinking about doing some of the work outside of the client (the web browser) and putting it in a background process running on the same or different machines. This process can handle many more connections and you are just responsible for getting the data back from it. Since it is local(ish) you'll get results back quickly even with minimal connections.

jQuery click / toggle between two functions

I don't think you should implement the toggle method since there is a reason why it was removed from jQuery 1.9.

Consider using toggleClass instead that is fully supported by jQuery:

function a(){...}
function b(){...}   

Let's say for example that your event trigger is onclick, so:

First option:

$('#test').on('click', function (event) {

    $(this).toggleClass('toggled');

    if ($(this).hasClass('toggled')) {
        a();
    } else{
        b();
    }
}

You can also send the handler functions as parameters:

Second option:

$('#test').on('click',{handler1: a, handler2: b}, function (event) {

    $(this).toggleClass('toggled');

    if ($(this).hasClass('toggled')) {
        event.data.handler1();
    } else{
        event.data.handler2();
    }
}

What is the difference between functional and non-functional requirements?

FUNCTIONAL REQUIREMENTS the activities the system must perform

  • business uses functions the users carry out
  • use cases example if you are developing a payroll system required functions
  • generate electronic fund transfers
  • calculation commission amounts
  • calculate payroll taxes
  • report tax deduction to the IRS

Why is this printing 'None' in the output?

Because there are two print statements. First is inside function and second is outside function. When function not return any thing that time it return None value.

Use return statement at end of function to return value.

e.g.:

Return None value.

>>> def test1():
...    print "In function."
... 
>>> a = test1()
In function.
>>> print a
None
>>> 
>>> print test1()
In function.
None
>>>
>>> test1()
In function.
>>> 

Use return statement

>>> def test():
...   return "ACV"
... 
>>> print test()
ACV
>>> 
>>> a = test()
>>> print a
ACV
>>> 

Instagram: Share photo from webpage

Uploading on Instagram is possible. Their API provides a media upload endpoint, even if it's not documented.

POST https://instagram.com/api/v1/media/upload/

Check this code for example https://code.google.com/p/twitubas/source/browse/common/instagram.php

"Object doesn't support property or method 'find'" in IE

You are using the JavaScript array.find() method. Note that this is standard JS, and has nothing to do with jQuery. In fact, your entire code in the question makes no use of jQuery at all.

You can find the documentation for array.find() here: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/find

If you scroll to the bottom of this page, you will note that it has browser support info, and you will see that it states that IE does not support this method.

Ironically, your best way around this would be to use jQuery, which does have similar functionality that is supported in all browsers.

"Expected an indented block" error?

I also experienced that for example:

This code doesnt work and get the intended block error.

class Foo(models.Model):
title = models.CharField(max_length=200)
body = models.TextField()
pub_date = models.DateTimeField('date published')
likes = models.IntegerField()

def __unicode__(self):
return self.title

However, when i press tab before typing return self.title statement, the code works.

class Foo(models.Model):
title = models.CharField(max_length=200)
body = models.TextField()
pub_date = models.DateTimeField('date published')
likes = models.IntegerField()

def __unicode__(self):
    return self.title

Hope, this will help others.

When to use MongoDB or other document oriented database systems?

The 2 main reason why you might want to prefer Mongo are

  • Flexibility in schema design (JSON type document store).
  • Scalability - Just add up nodes and it can scale horizontally quite well.

It is suitable for big data applications. RDBMS is not good for big data.

Create a branch in Git from another branch

If you like the method in the link you've posted, have a look at Git Flow.

It's a set of scripts he created for that workflow.

But to answer your question:

$ git checkout -b myFeature dev

Creates MyFeature branch off dev. Do your work and then

$ git commit -am "Your message"

Now merge your changes to dev without a fast-forward

$ git checkout dev
$ git merge --no-ff myFeature

Now push changes to the server

$ git push origin dev
$ git push origin myFeature

And you'll see it how you want it.

How can I determine whether a 2D Point is within a Polygon?

For the completeness, here's the lua implementation of the algorithm provided by nirg and discussed by Mecki:

function pnpoly(area, test)
    local inside = false
    local tx, ty = table.unpack(test)
    local j = #area
    for i=1, #area do
        local vxi, vyi = table.unpack(area[i])
        local vxj, vyj = table.unpack(area[j])
        if (vyi > ty) ~= (vyj > ty)
        and tx < (vxj - vxi)*(ty - vyi)/(vyj - vyi) + vxi
        then
            inside = not inside
        end
        j = i
    end
    return inside
end

The variable area is a table of points which are in turn stored as 2D tables. Example:

> A = {{2, 1}, {1, 2}, {15, 3}, {3, 4}, {5, 3}, {4, 1.5}}
> T = {2, 1.1}
> pnpoly(A, T)
true

The link to GitHub Gist.

What does `set -x` do?

set -x

Prints a trace of simple commands, for commands, case commands, select commands, and arithmetic for commands and their arguments or associated word lists after they are expanded and before they are executed. The value of the PS4 variable is expanded and the resultant value is printed before the command and its expanded arguments.

[source]

Example

set -x
echo `expr 10 + 20 `
+ expr 10 + 20
+ echo 30
30

set +x
echo `expr 10 + 20 `
30

Above example illustrates the usage of set -x. When it is used, above arithmetic expression has been expanded. We could see how a singe line has been evaluated step by step.

  • First step expr has been evaluated.
  • Second step echo has been evaluated.

To know more about set ? visit this link

when it comes to your shell script,

[ "$DEBUG" == 'true' ] && set -x

Your script might have been printing some additional lines of information when the execution mode selected as DEBUG. Traditionally people used to enable debug mode when a script called with optional argument such as -d

PL/SQL, how to escape single quote in a string?

You can use literal quoting:

stmt := q'[insert into MY_TBL (Col) values('ER0002')]';

Documentation for literals can be found here.

Alternatively, you can use two quotes to denote a single quote:

stmt := 'insert into MY_TBL (Col) values(''ER0002'')';

The literal quoting mechanism with the Q syntax is more flexible and readable, IMO.

Error "gnu/stubs-32.h: No such file or directory" while compiling Nachos source code

On Debian/Ubuntu use:

sudo apt-get install g++-multilib libc6-dev-i386

How to find SQL Server running port?

Try to enable the protocol by: Configuration Manger > SQL server Network Configuration > Protocols for MSSQLSERVER > properties of TCP/IP

Understanding MongoDB BSON Document size limit

Nested Depth for BSON Documents: MongoDB supports no more than 100 levels of nesting for BSON documents.

More more info vist

How to save .xlsx data to file as a blob

This works as of: v0.14.0 of https://github.com/SheetJS/js-xlsx

/* generate array buffer */
var wbout = XLSX.write(wb, {type:"array", bookType:'xlsx'});
/* create data URL */
var url = URL.createObjectURL(new Blob([wbout], {type: 'application/octet-stream'}));
/* trigger download with chrome API */
chrome.downloads.download({ url: url, filename: "testsheet.xlsx", saveAs: true });

How to get city name from latitude and longitude coordinates in Google Maps?

You can use this if you have a list:

Address address = list.get(0);
String cityname = address.getLocality();

Vagrant shared and synced folders

shared folders VS synced folders

Basically shared folders are renamed to synced folder from v1 to v2 (docs), under the bonnet it is still using vboxsf between host and guest (there is known performance issues if there are large numbers of files/directories).

Vagrantfile directory mounted as /vagrant in guest

Vagrant is mounting the current working directory (where Vagrantfile resides) as /vagrant in the guest, this is the default behaviour.

See docs

NOTE: By default, Vagrant will share your project directory (the directory with the Vagrantfile) to /vagrant.

You can disable this behaviour by adding cfg.vm.synced_folder ".", "/vagrant", disabled: true in your Vagrantfile.

Why synced folder is not working

Based on the output /tmp on host was NOT mounted during up time.

Use VAGRANT_INFO=debug vagrant up or VAGRANT_INFO=debug vagrant reload to start the VM for more output regarding why the synced folder is not mounted. Could be a permission issue (mode bits of /tmp on host should be drwxrwxrwt).

I did a test quick test using the following and it worked (I used opscode bento raring vagrant base box)

config.vm.synced_folder "/tmp", "/tmp/src"

output

$ vagrant reload
[default] Attempting graceful shutdown of VM...
[default] Setting the name of the VM...
[default] Clearing any previously set forwarded ports...
[default] Creating shared folders metadata...
[default] Clearing any previously set network interfaces...
[default] Available bridged network interfaces:
1) eth0
2) vmnet8
3) lxcbr0
4) vmnet1
What interface should the network bridge to? 1
[default] Preparing network interfaces based on configuration...
[default] Forwarding ports...
[default] -- 22 => 2222 (adapter 1)
[default] Running 'pre-boot' VM customizations...
[default] Booting VM...
[default] Waiting for VM to boot. This can take a few minutes.
[default] VM booted and ready for use!
[default] Configuring and enabling network interfaces...
[default] Mounting shared folders...
[default] -- /vagrant
[default] -- /tmp/src

Within the VM, you can see the mount info /tmp/src on /tmp/src type vboxsf (uid=900,gid=900,rw).

How to fill a Javascript object literal with many static key/value pairs efficiently?

Give this a try:

var map = {"aaa": "rrr", "bbb": "ppp"};

How can I specify working directory for popen

subprocess.Popen takes a cwd argument to set the Current Working Directory; you'll also want to escape your backslashes ('d:\\test\\local'), or use r'd:\test\local' so that the backslashes aren't interpreted as escape sequences by Python. The way you have it written, the \t part will be translated to a tab.

So, your new line should look like:

subprocess.Popen(r'c:\mytool\tool.exe', cwd=r'd:\test\local')

To use your Python script path as cwd, import os and define cwd using this:

os.path.dirname(os.path.realpath(__file__)) 

Creating java date object from year,month,day

That's my favorite way prior to Java 8:

Date date = new GregorianCalendar(year, month - 1, day).getTime();

I'd say this is a cleaner approach than:

calendar.set(year, month - 1, day, 0, 0);