Play infinitely looping video on-load in HTML5

For iPhone it works if you add also playsinline so:

<video width="320" height="240" autoplay loop muted playsinline>
  <source src="movie.mp4" type="video/mp4" />
</video>

ssh : Permission denied (publickey,gssapi-with-mic)

Maybe you should assign the public key to the authorized_keys, the simple way to do this is using ssh-copy-id -i your-pub-key-file user@dest.

How can I add C++11 support to Code::Blocks compiler?

A simple way is to write:

-std=c++11

in the Other Options section of the compiler flags. You could do this on a per-project basis (Project -> Build Options), and/or set it as a default option in the Settings -> Compilers part.

Some projects may require -std=gnu++11 which is like C++11 but has some GNU extensions enabled.

If using g++ 4.9, you can use -std=c++14 or -std=gnu++14.

How to convert a String to long in javascript?

It's because there is no long in javascript.

http://javascript.about.com/od/reference/g/rlong.htm

Achieving white opacity effect in html/css

If you can't use rgba due to browser support, and you don't want to include a semi-transparent white PNG, you will have to create two positioned elements. One for the white box, with opacity, and one for the overlaid text, solid.

_x000D_

body { background: red; }_x000D_
_x000D_
.box { position: relative; z-index: 1; }_x000D_
.box .back {_x000D_
    position: absolute; z-index: 1;_x000D_
    top: 0; left: 0; width: 100%; height: 100%;_x000D_
    background: white; opacity: 0.75;_x000D_
}_x000D_
.box .text { position: relative; z-index: 2; }_x000D_
_x000D_
body.browser-ie8 .box .back { filter: alpha(opacity=75); }

_x000D_

<!--[if lt IE 9]><body class="browser-ie8"><![endif]-->_x000D_
<!--[if gte IE 9]><!--><body><!--<![endif]-->_x000D_
    <div class="box">_x000D_
        <div class="back"></div>_x000D_
        <div class="text">_x000D_
            Lorem ipsum dolor sit amet blah blah boogley woogley oo._x000D_
        </div>_x000D_
    </div>_x000D_
</body>

_x000D_

How do I configure Maven for offline development?

Answering your question directly: it does not require an internet connection, but access to a repository, on LAN or local disk (use hints from other people who posted here).

If your project is not in a mature phase, that means when POMs are changed quite often, offline mode will be very impractical, as you'll have to update your repository quite often, too. Unless you can get a copy of a repository that has everything you need, but how would you know? Usually you start a repository from scratch and it gets cloned gradually during development (on a computer connected to another repository). A copy of the repo1.maven.org public repository weighs hundreds of gigabytes, so I wouldn't recommend brute force, either.

"No Content-Security-Policy meta tag found." error in my phonegap application

For me it was enough to reinstall whitelist plugin:

cordova plugin remove cordova-plugin-whitelist

and then

cordova plugin add cordova-plugin-whitelist

It looks like updating from previous versions of Cordova was not succesful.

PHP - Get key name of array value

If the name's dynamic, then you must have something like

$arr[$key]

which'd mean that $key contains the value of the key.

You can use array_keys() to get ALL the keys of an array, e.g.

$arr = array('a' => 'b', 'c' => 'd')
$x = array_keys($arr);

would give you

$x = array(0 => 'a', 1 => 'c');

What is sharding and why is it important?

In my opinion the application tier should have no business determining where data should be stored

This is a good rule but like most things not always correct.

When you do your architecture you start with responsibilities and collaborations. Once you determine your functional architecture, you have to balance the non-functional forces.

If one of these non-functional forces is massive scalability, you have to adapt your architecture to cater for this force even if it means that your data storage abstraction now leaks into your application tier.

How to get the previous page URL using JavaScript?

You want in page A to know the URL of page B?

Or to know in page B the URL of page A?

In Page B: document.referrer if set. As already shown here: How to get the previous URL in JavaScript?

In page A you would need to read a cookie or local/sessionStorage you set in page B, assuming the same domains

Suppress warning messages using mysql from within Terminal, but password written in bash script

Here's how I got my bash script for my daily mysqldump database backups to work more securely. This is an expansion of Cristian Porta's great answer.

First use mysql_config_editor (comes with mysql 5.6+) to set up the encrypted password file. Suppose your username is "db_user". Running from the shell prompt:
```
mysql_config_editor set --login-path=local --host=localhost --user=db_user --password
```
It prompts for the password. Once you enter it, the user/pass are saved encrypted in your home/system_username/.mylogin.cnf

Of course, change "system_username" to your username on the server.

Change your bash script from this:

mysqldump -u db_user -pInsecurePassword my_database | gzip > db_backup.tar.gz

to this:

mysqldump --login-path=local my_database | gzip > db_backup.tar.gz

No more exposed passwords.

How to fix '.' is not an internal or external command error

Replacing forward(/) slash with backward(\) slash will do the job. The folder separator in Windows is \ not /

how to check for datatype in node js- specifically for integer

you can try this one isNaN(Number(x)) where x is any thing like string or number

SQL Query - how do filter by null or not null

WHERE something IS NULL

and

WHERE something IS NOT NULL

Case insensitive access for generic dictionary

Its not very elegant but in case you cant change the creation of dictionary, and all you need is a dirty hack, how about this:

var item = MyDictionary.Where(x => x.Key.ToLower() == MyIndex.ToLower()).FirstOrDefault();
    if (item != null)
    {
        TheValue = item.Value;
    }

Proper way to make HTML nested list?

Option 2

<ul>
<li>Choice A</li>
<li>Choice B
  <ul>
    <li>Sub 1</li>
    <li>Sub 2</li>
  </ul>
</li>
</ul>

Nesting Lists - UL

Format price in the current locale and currency

This is a charming answer. Work well on any currency which is selected for store.

$formattedPrice = Mage::helper('core')->currency($finalPrice, true, false);

Why do we use $rootScope.$broadcast in AngularJS?

$rootScope basically functions as an event listener and dispatcher.

To answer the question of how it is used, it used in conjunction with rootScope.$on;

$rootScope.$broadcast("hi");

$rootScope.$on("hi", function(){
    //do something
});

However, it is a bad practice to use $rootScope as your own app's general event service, since you will quickly end up in a situation where every app depends on $rootScope, and you do not know what components are listening to what events.

The best practice is to create a service for each custom event you want to listen to or broadcast.

.service("hiEventService",function($rootScope) {
    this.broadcast = function() {$rootScope.$broadcast("hi")}
    this.listen = function(callback) {$rootScope.$on("hi",callback)}
})

How to get Selected Text from select2 when using <input>

As of Select2 4.x, it always returns an array, even for non-multi select lists.

var data = $('your-original-element').select2('data')
alert(data[0].text);
alert(data[0].id);

For Select2 3.x and lower

Single select:

var data = $('your-original-element').select2('data');
if(data) {
  alert(data.text);
}

Note that when there is no selection, the variable 'data' will be null.

Multi select:

var data = $('your-original-element').select2('data')
alert(data[0].text);
alert(data[0].id);
alert(data[1].text);
alert(data[1].id);

From the 3.x docs:

data Gets or sets the selection. Analogous to val method, but works with objects instead of ids.

data method invoked on a single-select with an unset value will return null, while a data method invoked on an empty multi-select will return [].

IOS - How to segue programmatically using swift

This worked for me.

First of all give the view controller in your storyboard a Storyboard ID inside the identity inspector. Then use the following example code (ensuring the class, storyboard name and story board ID match those that you are using):

let viewController:
UIViewController = UIStoryboard(
    name: "Main", bundle: nil
).instantiateViewControllerWithIdentifier("ViewController") as UIViewController
// .instantiatViewControllerWithIdentifier() returns AnyObject!
// this must be downcast to utilize it

self.presentViewController(viewController, animated: false, completion: nil)

For more details see http://sketchytech.blogspot.com/2012/11/instantiate-view-controller-using.html best wishes

Android Studio rendering problems

In build.gradle below dependencies add:

configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == "com.android.support") {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion "27.+"
            }
        }
    }
}

This worked for me, I found it on stack, addressed as the "Theme Error solution": Theme Error - how to fix?

Type.GetType("namespace.a.b.ClassName") returns null

Make sure that the comma is directly after the fully qualified name

typeof(namespace.a.b.ClassName, AssemblyName)

As this wont work

typeof(namespace.a.b.ClassName ,AssemblyName)

I was stumped for a few days on this one

RegEx: Grabbing values between quotation marks

This version

accounts for escaped quotes

controls backtracking

/(["'])((?:(?!\1)[^\\]|(?:\\\\)*\\[^\\])*)\1/

SELECT COUNT in LINQ to SQL C#

Like that

var purchCount = (from purchase in myBlaContext.purchases select purchase).Count();

or even easier

var purchCount = myBlaContext.purchases.Count()

Convert an integer to a float number

Just for the sake of completeness, here is a link to the golang documentation which describes all types. In your case it is numeric types:

uint8       the set of all unsigned  8-bit integers (0 to 255)
uint16      the set of all unsigned 16-bit integers (0 to 65535)
uint32      the set of all unsigned 32-bit integers (0 to 4294967295)
uint64      the set of all unsigned 64-bit integers (0 to 18446744073709551615)

int8        the set of all signed  8-bit integers (-128 to 127)
int16       the set of all signed 16-bit integers (-32768 to 32767)
int32       the set of all signed 32-bit integers (-2147483648 to 2147483647)
int64       the set of all signed 64-bit integers (-9223372036854775808 to 9223372036854775807)

float32     the set of all IEEE-754 32-bit floating-point numbers
float64     the set of all IEEE-754 64-bit floating-point numbers

complex64   the set of all complex numbers with float32 real and imaginary parts
complex128  the set of all complex numbers with float64 real and imaginary parts

byte        alias for uint8
rune        alias for int32

Which means that you need to use float64(integer_value).

Python script to copy text to clipboard

This is the only way that worked for me using Python 3.5.2 plus it's the easiest to implement w/ using the standard PyData suite

Shout out to https://stackoverflow.com/users/4502363/gadi-oron for the answer (I copied it completely) from How do I copy a string to the clipboard on Windows using Python?

import pandas as pd
df=pd.DataFrame(['Text to copy'])
df.to_clipboard(index=False,header=False)

I wrote a little wrapper for it that I put in my ipython profile <3

Does Java read integers in little endian or big endian?

I would read the bytes one by one, and combine them into a long value. That way you control the endianness, and the communication process is transparent.

How can I declare and use Boolean variables in a shell script?

How can I declare and use Boolean variables in a shell script?

Unlike many other programming languages, Bash does not segregate its variables by "type." [1]

So the answer is pretty clear. There isn't any Boolean variable in Bash.

However:

Using a declare statement, we can limit the value assignment to variables.[2]

#!/bin/bash
declare -ir BOOL=(0 1) # Remember BOOL can't be unset till this shell terminates
readonly false=${BOOL[0]}
readonly true=${BOOL[1]}

# Same as declare -ir false=0 true=1
((true)) && echo "True"
((false)) && echo "False"
((!true)) && echo "Not True"
((!false)) && echo "Not false"

The r option in declare and readonly is used to state explicitly that the variables are readonly. I hope the purpose is clear.

Evaluate list.contains string in JSTL

there is no built-in feature to check that - what you would do is write your own tld function which takes a list and an item, and calls the list's contains() method. e.g.

//in your own WEB-INF/custom-functions.tld file add this
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
        PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
        "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib
        xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
        version="2.0"
        >
    <tlib-version>1.0</tlib-version>
    <function>
        <name>contains</name>
        <function-class>com.Yourclass</function-class>
        <function-signature>boolean contains(java.util.List,java.lang.Object)
        </function-signature>
    </function>
</taglib>

Then create a class called Yourclass, and add a static method called contains with the above signature. I m sure the implementation of that method is pretty self explanatory:

package com; // just to illustrate how to represent the package in the tld
public class Yourclass {
   public static boolean contains(List list, Object o) {
      return list.contains(o);
   }
}

Then you can use it in your jsp:

<%@ taglib uri="/WEB-INF/custom-functions.tld" prefix="fn" %>
<c:if test="${  fn:contains( mylist, myValue ) }">style='display:none;'</c:if>

The tag can be used from any JSP in the site.

edit: more info regarding the tld file - more info here

Can I delete a git commit but keep the changes?

Using git 2.9 (precisely 2.9.2.windows.1) git reset HEAD^ prompts for more; not sure what is expected input here. Please refer below screenshot

Found other solution git reset HEAD~#numberOfCommits using which we can choose to select number of local commits you want to reset by keeping your changes intact. Hence, we get an opportunity to throw away all local commits as well as limited number of local commits.

Refer below screenshots showing git reset HEAD~1 in action:

comparing 2 strings alphabetically for sorting purposes

Lets say that we have an array of objects:

{ name : String }

then we can sort our array as follows:

array.sort(function(a, b) {
    var orderBool = a.name > b.name;
    return orderBool ? 1 : -1;
});

Note: Be careful for upper letters, you may need to cast your string to lower case due to your purpose.

How set maximum date in datepicker dialog in android?

private int pYear;
private int pMonth;
private int pDay;
static final int DATE_DIALOG_ID = 0;

/**inside oncreate */
final Calendar c = Calendar.getInstance();
         pYear= c.get(Calendar.YEAR);
         pMonth = c.get(Calendar.MONTH);
         pDay = c.get(Calendar.DAY_OF_MONTH);


 @Override
     protected Dialog onCreateDialog(int id) {
             switch (id) {
             case DATE_DIALOG_ID:
                     return new DatePickerDialog(this,
                             mDateSetListener,
                             pYear, pMonth-1, pDay);
            }

             return null;
     }
     protected void onPrepareDialog(int id, Dialog dialog) {
             switch (id) {
             case DATE_DIALOG_ID:
                     ((DatePickerDialog) dialog).updateDate(pYear, pMonth-1, pDay);
                     break;
             }
     }   
     private DatePickerDialog.OnDateSetListener mDateSetListener =
         new DatePickerDialog.OnDateSetListener() {
         public void onDateSet(DatePicker view, int year, int monthOfYear,
                         int dayOfMonth) {
                // write your code here to get the selected Date
         }
 };

try this it should work. Thanks

SQLite add Primary Key

You can't modify SQLite tables in any significant way after they have been created. The accepted suggested solution is to create a new table with the correct requirements and copy your data into it, then drop the old table.

here is the official documentation about this: http://sqlite.org/faq.html#q11

C compiling - "undefined reference to"?

As stated by a few others, this is a linking error. The section of code where this function is being called doesn't know what this function is. It either needs to be declared in a header file an defined in its own source file, or defined or declared in the same source file, above where it's being called.

Edit: In older versions of C, C89/C90, function declarations weren't actually required. So, you could just add the definition anywhere in the file in which you're using the function, even after the call and the compiler would infer the declaration. For example,

int main()
{
  int a = func();
}

int func()
{
   return 1;
}

However, this isn't good practice today and most languages, C++ for example, won't allow it. One way to get away with defining the function in the same source file in which you're using it, is to declare it at the beginning of the file. So, the previous example would look like this instead.

int func();

int main()
{
   int a = func();
}

int func()
{
  return 1;
}

Get the last non-empty cell in a column in Google Sheets

for a row:

=ARRAYFORMULA(INDIRECT("A"&MAX(IF(A:A<>"", ROW(A:A), ))))

for a column:

=ARRAYFORMULA(INDIRECT(ADDRESS(1, MAX(IF(1:1<>"", COLUMN(1:1), )), 4)))

Where does MAMP keep its php.ini?

Note: If this doesn't help, check below for Ricardo Martins' answer.

Create a PHP script with <?php phpinfo() ?> in it, run that from your browser, and look for the value Loaded Configuration File. This tells you which php.ini file PHP is using in the context of the web server.

How to set default value for column of new created table from select statement in 11g

You will need to alter table abc modify (salary default 0);

How to show the "Are you sure you want to navigate away from this page?" when changes committed?

here is my html

<!DOCTYPE HMTL>
<meta charset="UTF-8">
<html>
<head>
<title>Home</title>
<script type="text/javascript" src="script.js"></script>
</head>

 <body onload="myFunction()">
    <h1 id="belong">
        Welcome To My Home
    </h1>
    <p>
        <a id="replaceME" onclick="myFunction2(event)" href="https://www.ccis.edu">I am a student at Columbia College of Missouri.</a>
    </p>
</body>

And so this is how I did something similar in javaScript

var myGlobalNameHolder ="";

function myFunction(){
var myString = prompt("Enter a name", "Name Goes Here");
    myGlobalNameHolder = myString;
    if (myString != null) {
        document.getElementById("replaceME").innerHTML =
        "Hello " + myString + ". Welcome to my site";

        document.getElementById("belong").innerHTML =
        "A place you belong";
    }   
}

// create a function to pass our event too
function myFunction2(event) {   
// variable to make our event short and sweet
var x=window.onbeforeunload;
// logic to make the confirm and alert boxes
if (confirm("Are you sure you want to leave my page?") == true) {
    x = alert("Thank you " + myGlobalNameHolder + " for visiting!");
}
}

What's the u prefix in a Python string?

It's Unicode.

Just put the variable between str(), and it will work fine.

But in case you have two lists like the following:

a = ['co32','co36']
b = [u'co32',u'co36']

If you check set(a)==set(b), it will come as False, but if you do as follows:

b = str(b)
set(a)==set(b)

Now, the result will be True.

List of foreign keys and the tables they reference in Oracle DB

select d.table_name,

       d.constraint_name "Primary Constraint Name",

       b.constraint_name "Referenced Constraint Name"

from user_constraints d,

     (select c.constraint_name,

             c.r_constraint_name,

             c.table_name

      from user_constraints c 

      where table_name='EMPLOYEES' --your table name instead of EMPLOYEES

      and constraint_type='R') b

where d.constraint_name=b.r_constraint_name

Testing web application on Mac/Safari when I don't own a Mac

The best site to test website and see them realtime on MAC Safari is by using

Browserstack

They have like 25 free minutes of first time testing and then 10 free mins each day..You can even test your pages from your local PC by using their WEB TUNNEL Feature

I tested 7 to 8 pages in browserstack...And I think they have some java debugging tool in the upper right corner that is great help

heroku - how to see all the logs

You can access your log files using Heroku's Command Line Interface (CLI Usage).

If Heroku's CLI is installed and you know your application name (like https://myapp.herokuapp.com/), then you can run the following command:

heroku logs --tail --app=myapp

You can also access the logs in a real-time stream using:

heroku logs --source app --tail --app=myapp

If the logs tell you something like this:

npm ERR! A complete log of this run can be found in:

npm ERR! /app/.npm/_logs/2017-07-11T08_29_45_291Z-debug.log

Then you can also access them using the bash terminal via Heroku CLI:

heroku run bash --app=myapp
less ./.npm/_logs/2017-07-11T08_29_45_291Z-debug.log

Using SVG as background image

With my solution you're able to get something similar:

Here is bulletproff solution:

Your html: <input class='calendarIcon'/>

Your SVG: i used fa-calendar-alt

(any IDE may open svg image as shown below)

To use it at css background-image you gotta encode the svg to address valid string. I used this tool

As far as you got all stuff you need, you're coming to css

.calendarIcon{
      //your url will be something like this:
      background-image: url("data:image/svg+xml,***<here place encoded svg>***");
      background-repeat: no-repeat;
    }

Note: these styling wont have any effect on encoded svg image

.{
      fill: #f00; //neither this
      background-color: #f00; //nor this
}

because all changes over the image must be applied directly to its svg code

<svg xmlns="" path="" fill="#f00"/></svg>

To achive the location righthand i copied some Bootstrap spacing and my final css get the next look:

.calendarIcon{
      background-image: url("data:image/svg+xml,%3Csvg...svg%3E");
      background-repeat: no-repeat;
      padding-right: calc(1.5em + 0.75rem);
      background-position: center right calc(0.375em + 0.1875rem);
      background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
    }

How to create temp table using Create statement in SQL Server?

A temporary table can have 3 kinds, the # is the most used. This is a temp table that only exists in the current session. An equivalent of this is @, a declared table variable. This has a little less "functions" (like indexes etc) and is also only used for the current session. The ## is one that is the same as the #, however, the scope is wider, so you can use it within the same session, within other stored procedures.

You can create a temp table in various ways:

declare @table table (id int)
create table #table (id int)
create table ##table (id int)
select * into #table from xyz

Iterating through all nodes in XML file

A recursive algorithm that parses through an XmlDocument

Here is an example - Recursively reading an xml document and using regex to get contents

Here is another recursive example - http://www.java2s.com/Tutorial/CSharp/0540__XML/LoopThroughXmlDocumentRecursively.html

Git pull a certain branch from GitHub

git pull <gitreponame> <branchname>

Usually if you have only repo assigned to your code then the gitreponame would be origin.

If you are working on two repo's like one is local and another one for remote like you can check repo's list from git remote -v. this shows how many repo's are assigned to your current code.

BranchName should exists into corresponding gitreponame.

you can use following two commands to add or remove repo's

git remote add <gitreponame> <repourl>
git remote remove <gitreponame>

How can I regenerate ios folder in React Native project?

If you are lost with errors like module not found there is noway other the than following method if you have used react native CLI.I had faced similar issue as a result of openning xcode project from .xcodeproj file instead of .xcworkspace. Also please note that react-native eject only for Expo project.

The only workaround to regenarate ios and android folders within a react native project is the following.

Generate a project with same name using the command react-native init
Backup your old project ios and android directories into a backup location
Then copy ios and android directories from newly created project into your old not working project
Run pod install within the copied ios directory

Now your problem should be solved

How do I retrieve an HTML element's actual width and height?

Just in case it is useful to anyone, I put a textbox, button and div all with the same css:

width:200px;
height:20px;
border:solid 1px #000;
padding:2px;

<input id="t" type="text" />
<input id="b" type="button" />
<div   id="d"></div>

I tried it in chrome, firefox and ie-edge, I tried with jquery and without, and I tried it with and without box-sizing:border-box. Always with <!DOCTYPE html>

The results:

                                                               Firefox       Chrome        IE-Edge    
                                                              with   w/o    with   w/o    with   w/o     box-sizing

$("#t").width()                                               194    200    194    200    194    200
$("#b").width()                                               194    194    194    194    194    194
$("#d").width()                                               194    200    194    200    194    200

$("#t").outerWidth()                                          200    206    200    206    200    206
$("#b").outerWidth()                                          200    200    200    200    200    200
$("#d").outerWidth()                                          200    206    200    206    200    206

$("#t").innerWidth()                                          198    204    198    204    198    204
$("#b").innerWidth()                                          198    198    198    198    198    198
$("#d").innerWidth()                                          198    204    198    204    198    204

$("#t").css('width')                                          200px  200px  200px  200px  200px  200px
$("#b").css('width')                                          200px  200px  200px  200px  200px  200px
$("#d").css('width')                                          200px  200px  200px  200px  200px  200px

$("#t").css('border-left-width')                              1px    1px    1px    1px    1px    1px
$("#b").css('border-left-width')                              1px    1px    1px    1px    1px    1px
$("#d").css('border-left-width')                              1px    1px    1px    1px    1px    1px

$("#t").css('padding-left')                                   2px    2px    2px    2px    2px    2px
$("#b").css('padding-left')                                   2px    2px    2px    2px    2px    2px
$("#d").css('padding-left')                                   2px    2px    2px    2px    2px    2px

document.getElementById("t").getBoundingClientRect().width    200    206    200    206    200    206
document.getElementById("b").getBoundingClientRect().width    200    200    200    200    200    200
document.getElementById("d").getBoundingClientRect().width    200    206    200    206    200    206

document.getElementById("t").offsetWidth                      200    206    200    206    200    206
document.getElementById("b").offsetWidth                      200    200    200    200    200    200
document.getElementById("d").offsetWidth                      200    206    200    206    200    206

Create a button programmatically and set a background image

Try below:

let image = UIImage(named: "ImageName.png") as UIImage
var button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.frame = CGRectMake(100, 100, 100, 100)
button .setBackgroundImage(image, forState: UIControlState.Normal)
button.addTarget(self, action: "Action:", forControlEvents:UIControlEvents.TouchUpInside)
menuView.addSubview(button)

Let me know whether if it works or not?

"Cloning" row or column vectors

To answer the actual question, now that nearly a dozen approaches to working around a solution have been posted: x.transpose reverses the shape of x. One of the interesting side-effects is that if x.ndim == 1, the transpose does nothing.

This is especially confusing for people coming from MATLAB, where all arrays implicitly have at least two dimensions. The correct way to transpose a 1D numpy array is not x.transpose() or x.T, but rather

x[:, None]

x.reshape(-1, 1)

From here, you can multiply by a matrix of ones, or use any of the other suggested approaches, as long as you respect the (subtle) differences between MATLAB and numpy.

How to transform numpy.matrix or array to scipy sparse matrix

In Python, the Scipy library can be used to convert the 2-D NumPy matrix into a Sparse matrix. SciPy 2-D sparse matrix package for numeric data is scipy.sparse

The scipy.sparse package provides different Classes to create the following types of Sparse matrices from the 2-dimensional matrix:

Block Sparse Row matrix
A sparse matrix in COOrdinate format.
Compressed Sparse Column matrix
Compressed Sparse Row matrix
Sparse matrix with DIAgonal storage
Dictionary Of Keys based sparse matrix.
Row-based list of lists sparse matrix
This class provides a base class for all sparse matrices.

CSR (Compressed Sparse Row) or CSC (Compressed Sparse Column) formats support efficient access and matrix operations.

Example code to Convert Numpy matrix into Compressed Sparse Column(CSC) matrix & Compressed Sparse Row (CSR) matrix using Scipy classes:

import sys                 # Return the size of an object in bytes
import numpy as np         # To create 2 dimentional matrix
from scipy.sparse import csr_matrix, csc_matrix 
# csr_matrix: used to create compressed sparse row matrix from Matrix
# csc_matrix: used to create compressed sparse column matrix from Matrix

create a 2-D Numpy matrix

A = np.array([[1, 0, 0, 0, 0, 0],\
              [0, 0, 2, 0, 0, 1],\
              [0, 0, 0, 2, 0, 0]])
print("Dense matrix representation: \n", A)
print("Memory utilised (bytes): ", sys.getsizeof(A))
print("Type of the object", type(A))

Print the matrix & other details:

Dense matrix representation: 
 [[1 0 0 0 0 0]
 [0 0 2 0 0 1]
 [0 0 0 2 0 0]]
Memory utilised (bytes):  184
Type of the object <class 'numpy.ndarray'>

Converting Matrix A to the Compressed sparse row matrix representation using csr_matrix Class:

S = csr_matrix(A)
print("Sparse 'row' matrix: \n",S)
print("Memory utilised (bytes): ", sys.getsizeof(S))
print("Type of the object", type(S))

The output of print statements:

Sparse 'row' matrix:
(0, 0) 1
(1, 2) 2
(1, 5) 1
(2, 3) 2
Memory utilised (bytes): 56
Type of the object: <class 'scipy.sparse.csr.csc_matrix'>

Converting Matrix A to Compressed Sparse Column matrix representation using csc_matrix Class:

S = csc_matrix(A)
print("Sparse 'column' matrix: \n",S)
print("Memory utilised (bytes): ", sys.getsizeof(S))
print("Type of the object", type(S))

The output of print statements:

Sparse 'column' matrix:
(0, 0) 1
(1, 2) 2
(2, 3) 2
(1, 5) 1
Memory utilised (bytes): 56
Type of the object: <class 'scipy.sparse.csc.csc_matrix'>

As it can be seen the size of the compressed matrices is 56 bytes and the original matrix size is 184 bytes.

For a more detailed explanation and code examples please refer to this article: https://limitlessdatascience.wordpress.com/2020/11/26/sparse-matrix-in-machine-learning/

Exception of type 'System.OutOfMemoryException' was thrown. Why?

It runs successfully the first time, but if I run it again, I keep getting a System.OutOfMemoryException. What are some reasons this could be happening?

Regardless of what the others have said, the error has nothing to do with forgetting to dispose your DBCommand or DBConnection, and you will not fix your error by disposing of either of them.

The error has everything to do with your dataset which contains nearly 600,000 rows of data. Apparently your dataset consumes more than 50% of the available memory on your machine. Clearly, you'll run out of memory when you return another dataset of the same size before the first one has been garbage collected. Simple as that.

You can remedy this problem in a few ways:

Consider returning fewer records. I personally can't imagine a time when returning 600K records has ever been useful to a user. To minimize the records returned, try:
- Limiting your query to the first 1000 records. If there are more than 1000 results returned from the query, inform the user to narrow their search results.
- If your users really insist on seeing that much data at once, try paging the data. Remember: Google never shows you all 22 bajillion results of a search at once, it shows you 20 or so records at a time. Google probably doesn't hold all 22 bajillion results in memory at once, it probably finds its more memory efficient to requery its database to generate a new page.
If you just need to iterate through the data and you don't need random access, try returning a datareader instead. A datareader only loads one record into memory at a time.

If none of those are an option, then you need to force .NET to free up the memory used by the dataset before calling your method using one of these methods:

Remove all references to your old dataset. Anything holding on to a refenence of your dataset will prevent it from being reclaimed by memory.
If you can't null all the references to your dataset, clear all of the rows from the dataset and any objects bound to those rows instead. This removes references to the datarows and allows them to be eaten by the garbage collector.

I don't believe you'll need to call GC.Collect() to force a gen cycle. Not only is it generally a bad idea to call GC.Collect(), because sufficient memory pressure will cause .NET invoke the garbage collector on its own.

Note: calling Dispose on your dataset does not free any memory, nor does it invoke the garbage collector, nor does it remove a reference to your dataset. Dispose is used to clean up unmanaged resources, but the DataSet does not have any unmanaged resources. It only implements IDispoable because it inherents from MarshalByValueComponent, so the Dispose method on the dataset is pretty much useless.

Parsing JSON object in PHP using json_decode

You have to make sure first that your server allow remote connection so that the function file_get_contents($url) works fine , most server disable this feature for security reason.

Why call git branch --unset-upstream to fixup?

This might solve your problem.

after doing changes you can commit it and then

git remote add origin https://(address of your repo) it can be https or ssh
then
git push -u origin master

hope it works for you.

thanks

Warning: X may be used uninitialized in this function

one has not been assigned so points to an unpredictable location. You should either place it on the stack:

Vector one;
one.a = 12;
one.b = 13;
one.c = -11

or dynamically allocate memory for it:

Vector* one = malloc(sizeof(*one))
one->a = 12;
one->b = 13;
one->c = -11
free(one);

Note the use of free in this case. In general, you'll need exactly one call to free for each call made to malloc.

How to open some ports on Ubuntu?

Ubuntu these days comes with ufw - Uncomplicated Firewall. ufw is an easy-to-use method of handling iptables rules.

Try using this command to allow a port

sudo ufw allow 1701

To test connectivity, you could try shutting down the VPN software (freeing up the ports) and using netcat to listen, like this:

nc -l 1701

Then use telnet from your Windows host and see what shows up on your Ubuntu terminal. This can be repeated for each port you'd like to test.

How do you hide the Address bar in Google Chrome for Chrome Apps?

2016-05-04-03:59A - Windows 7 - Google Chrome [Version 50.0.2661.94]

wanted this done for a 'YouTube Pop-out Player' without Chrome Address / Toolbar or Bookmarks Bar; solution ended up being a small edit of MarkHu's answer (because of new updates, i guess?)

Go to the page you want altered, select Chrome Toolbar's 'Hamburger button' (3 horizontal lines).

From there: More tools > Add to desktop... > Open as window (tick box) > Add (button).

... and, simply open your page from the new desktop shortcut, adjust as needed, and enjoy!

Replace multiple characters in a C# string

Performance-Wise this probably might not be the best solution but it works.

var str = "filename:with&bad$separators.txt";
char[] charArray = new char[] { '#', '%', '&', '{', '}', '\\', '<', '>', '*', '?', '/', ' ', '$', '!', '\'', '"', ':', '@' };
foreach (var singleChar in charArray)
{
   str = str.Replace(singleChar, '_');
}

IIS - 401.3 - Unauthorized

Create a new Site, Right Click on Sites folder then click add Site
Enter the site name.
Select physical path
Select Ip Address
Change Port
Click OK
Go to Application Pools
Select the site pool
Right-click the click Advance Settings
Change the .Net CLR Version to "No Manage Code"
Change the Identity to "ApplicationPoolIdentity"
Go to Site home page then click "Authentication"
Right-click to AnonymousAuthentication then click "Edit"
Select Application Pool Identity
Click ok
boom!

for routes add a web.config

<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="React Routes" stopProcessing="true">
                    <match url=".*" />
                    <conditions logicalGrouping="MatchAll">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
                        <add input="{REQUEST_URI}" pattern="^/(api)" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="/" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

How to assign a value to a TensorFlow variable?

Here is the complete working example:

import numpy as np
import tensorflow as tf

w= tf.Variable(0, dtype=tf.float32) #good practice to set the type of the variable
cost = 10 + 5*w + w*w
train = tf.train.GradientDescentOptimizer(0.01).minimize(cost)

init = tf.global_variables_initializer()
session = tf.Session()
session.run(init)

print(session.run(w))

session.run(train)
print(session.run(w)) # runs one step of gradient descent

for i in range(10000):
  session.run(train)

print(session.run(w))

Note the output will be:

0.0
-0.049999997
-2.499994

This means at the very start the Variable was 0, as defined, then after just one step of gradient decent the variable was -0.049999997, and after 10.000 more steps we are reaching -2.499994 (based on our cost function).

Note: You originally used the Interactive session. Interactive session is useful when multiple different sessions needed to be run in the same script. However, I used the non interactive session for simplicity.

Timing Delays in VBA

With Due credits and thanks to Steve Mallroy.

I had midnight issues in Word and the below code worked for me

Public Function Pause(NumberOfSeconds As Variant)
 '   On Error GoTo Error_GoTo

    Dim PauseTime, Start
    Dim objWord As Word.Document

    'PauseTime = 10 ' Set duration in seconds
    PauseTime = NumberOfSeconds
    Start = Timer ' Set start time.

    If Start + PauseTime > 86399 Then 'playing safe hence 86399

    Start = 0

    Do While Timer > 1
        DoEvents ' Yield to other processes.
    Loop

    End If

    Do While Timer < Start + PauseTime
        DoEvents ' Yield to other processes.
    Loop

End Function

How do you create a UIImage View Programmatically - Swift

First create UIImageView then add image in UIImageView .

    var imageView : UIImageView
    imageView  = UIImageView(frame:CGRectMake(10, 50, 100, 300));
    imageView.image = UIImage(named:"image.jpg")
    self.view.addSubview(imageView)

use video as background for div

Pure CSS method

It is possible to center a video inside an element just like a cover sized background-image without JS using the object-fit attribute or CSS Transforms.

2021 answer: object-fit

As pointed in the comments, it is possible to achieve the same result without CSS transform, but using object-fit, which I think it's an even better option for the same result:

_x000D_

.video-container {
    height: 300px;
    width: 300px;
    position: relative;
}

.video-container video {
  width: 100%;
  height: 100%;
  position: absolute;
  object-fit: cover;
  z-index: 0;
}

/* Just styling the content of the div, the *magic* in the previous rules */
.video-container .caption {
  z-index: 1;
  position: relative;
  text-align: center;
  color: #dc0000;
  padding: 10px;
}

_x000D_

<div class="video-container">
    <video autoplay muted loop>
        <source src="https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" type="video/mp4" />
    </video>
    <div class="caption">
      <h2>Your caption here</h2>
    </div>
</div>

_x000D_

Previous answer: CSS Transform

You can set a video as a background to any HTML element easily thanks to transform CSS property.

Note that you can use the transform technique to center vertically and horizontally any HTML element.

_x000D_

.video-container {
  height: 300px;
  width: 300px;
  overflow: hidden;
  position: relative;
}

.video-container video {
  min-width: 100%;
  min-height: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

/* Just styling the content of the div, the *magic* in the previous rules */
.video-container .caption {
  z-index: 1;
  position: relative;
  text-align: center;
  color: #dc0000;
  padding: 10px;
}

_x000D_

<div class="video-container">
  <video autoplay muted loop>
    <source src="https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" type="video/mp4" />
  </video>
  <div class="caption">
    <h2>Your caption here</h2>
  </div>
</div>

_x000D_

How to access custom attributes from event object in React?

You can simply use event.target.dataset object . This will give you the object with all data attributes.

How to add fixed button to the bottom right of page

This will be helpful for the right bottom rounded button

HTML :

      <a class="fixedButton" href>
         <div class="roundedFixedBtn"><i class="fa fa-phone"></i></div>
      </a>

CSS:

       .fixedButton{
            position: fixed;
            bottom: 0px;
            right: 0px; 
            padding: 20px;
        }
        .roundedFixedBtn{
          height: 60px;
          line-height: 80px;  
          width: 60px;  
          font-size: 2em;
          font-weight: bold;
          border-radius: 50%;
          background-color: #4CAF50;
          color: white;
          text-align: center;
          cursor: pointer;
        }

Here is jsfiddle link http://jsfiddle.net/vpthcsx8/11/

Specify sudo password for Ansible

My hack to automate this was to use an environment variable and access it via --extra-vars="ansible_become_pass='{{ lookup('env', 'ANSIBLE_BECOME_PASS') }}'".

Export an env var, but avoid bash/shell history (prepend with a space, or other methods). E.g.:

     export ANSIBLE_BECOME_PASS='<your password>'

Lookup the env var while passing the extra ansible_become_pass variable into the ansible-playbook, E.g.:

ansible-playbook playbook.yml -i inventories/dev/hosts.yml -u user --extra-vars="ansible_become_pass='{{ lookup('env', 'ANSIBLE_BECOME_PASS') }}'"

Good alternate answers:

@toast38coza: simply use a vaulted value for ansible_become_pass. This is decent. However, for the paranoid teams that need to share ansible vault passwords, and execute ansible plays with induvidual accounts, they coudld use the shared vault password to reverse each others operating system password (identiy theft). Arguably, you need to trust your own team?
@slm's bash subshell output generated to temp file descriptor and using the @ prefix to read the ansible variable from the file desriptor. Avoids bash history at least. Not sure, but hopefully subshell echo doesn't get caught and exposed in audit logging (e.g. auditd).

How to split a string in Java

I just wanted to write an algorithm instead of using Java built-in functions:

public static List<String> split(String str, char c){
    List<String> list = new ArrayList<>();
    StringBuilder sb = new StringBuilder();

    for (int i = 0; i < str.length(); i++){
        if(str.charAt(i) != c){
            sb.append(str.charAt(i));
        }
        else{
            if(sb.length() > 0){
                list.add(sb.toString());
                sb = new StringBuilder();
            }
        }
    }

    if(sb.length() >0){
        list.add(sb.toString());
    }
    return list;
}

Is Visual Studio Community a 30 day trial?

VS 17 Community Edition is free. You just need to sign-in with your Microsoft account and everything will be fine again.

How to force JS to do math instead of putting two strings together

parseInt() should do the trick

var number = "25";
var sum = parseInt(number, 10) + 10;
var pin = number + 10;

Gives you

sum == 35
pin == "2510"

http://www.w3schools.com/jsref/jsref_parseint.asp

Note: The 10 in parseInt(number, 10) specifies decimal (base-10). Without this some browsers may not interpret the string correctly. See MDN: parseInt.

How to validate date with format "mm/dd/yyyy" in JavaScript?

I would use Moment.js for date validation.

alert(moment("05/22/2012", 'MM/DD/YYYY',true).isValid()); //true

Jsfiddle: http://jsfiddle.net/q8y9nbu5/

true value is for strict parsing credit to @Andrey Prokhorov which means

you may specify a boolean for the last argument to make Moment use strict parsing. Strict parsing requires that the format and input match exactly, including delimeters.

Calling stored procedure from another stored procedure SQL Server

Simply call test2 from test1 like:

EXEC test2 @newId, @prod, @desc;

Make sure to get @id using SCOPE_IDENTITY(), which gets the last identity value inserted into an identity column in the same scope:

SELECT @newId = SCOPE_IDENTITY()

Get Public URL for File - Google Cloud Storage - App Engine (Python)

You need to use get_serving_url from the Images API. As that page explains, you need to call create_gs_key() first to get the key to pass to the Images API.

Specifying trust store information in spring boot application.properties

I had the same problem with Spring Boot, Spring Cloud (microservices) and a self-signed SSL certificate. Keystore worked out of the box from application properties, and Truststore didn't.

I ended up keeping both keystore and trustore configuration in application.properties, and adding a separate configuration bean for configuring truststore properties with the System.

@Configuration
public class SSLConfig {
    @Autowired
    private Environment env;

    @PostConstruct
    private void configureSSL() {
      //set to TLSv1.1 or TLSv1.2
      System.setProperty("https.protocols", "TLSv1.1");

      //load the 'javax.net.ssl.trustStore' and
      //'javax.net.ssl.trustStorePassword' from application.properties
      System.setProperty("javax.net.ssl.trustStore", env.getProperty("server.ssl.trust-store")); 
      System.setProperty("javax.net.ssl.trustStorePassword",env.getProperty("server.ssl.trust-store-password"));
    }
}

Find multiple files and rename them in Linux

You can use find to find all matching files recursively:

$ find . -iname "*dbg*" -exec rename _dbg.txt .txt '{}' \;

EDIT: what the '{}' and \; are?

The -exec argument makes find execute rename for every matching file found. '{}' will be replaced with the path name of the file. The last token, \; is there only to mark the end of the exec expression.

All that is described nicely in the man page for find:

 -exec utility [argument ...] ;
         True if the program named utility returns a zero value as its
         exit status.  Optional arguments may be passed to the utility.
         The expression must be terminated by a semicolon (``;'').  If you
         invoke find from a shell you may need to quote the semicolon if
         the shell would otherwise treat it as a control operator.  If the
         string ``{}'' appears anywhere in the utility name or the argu-
         ments it is replaced by the pathname of the current file.
         Utility will be executed from the directory from which find was
         executed.  Utility and arguments are not subject to the further
         expansion of shell patterns and constructs.

Scheduled run of stored procedure on SQL server

If MS SQL Server Express Edition is being used then SQL Server Agent is not available. I found the following worked for all editions:

USE Master
GO

IF  EXISTS( SELECT *
            FROM sys.objects
            WHERE object_id = OBJECT_ID(N'[dbo].[MyBackgroundTask]')
            AND type in (N'P', N'PC'))
    DROP PROCEDURE [dbo].[MyBackgroundTask]
GO

CREATE PROCEDURE MyBackgroundTask
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- The interval between cleanup attempts
    declare @timeToRun nvarchar(50)
    set @timeToRun = '03:33:33'

    while 1 = 1
    begin
        waitfor time @timeToRun
        begin
            execute [MyDatabaseName].[dbo].[MyDatabaseStoredProcedure];
        end
    end
END
GO

-- Run the procedure when the master database starts.
sp_procoption    @ProcName = 'MyBackgroundTask',
                @OptionName = 'startup',
                @OptionValue = 'on'
GO

Some notes:

It is worth writing an audit entry somewhere so that you can see that the query actually ran.
The server needs rebooting once to ensure that the script runs the first time.
A related question is: How to run a stored procedure every day in SQL Server Express Edition?

How to throw an exception in C?

If you write code with Happy path design pattern (i.e. for embedded device) you may simulate exception error processing (aka deffering or finally emulation) with operator "goto".

int process(int port)
{
    int rc;
    int fd1;
    int fd2;

    fd1 = open("/dev/...", ...);
    if (fd1 == -1) {
      rc = -1;
      goto out;
    }

    fd2 = open("/dev/...", ...);
    if (fd2 == -1) {
      rc = -1;
      goto out;
    }

    // Do some with fd1 and fd2 for example write(f2, read(fd1))

    rc = 0;

   out:

    //if (rc != 0) {
        (void)close(fd1);
        (void)close(fd2);
    //}

    return rc;
}

It does not actually exception handler but it take you a way to handle error at fucntion exit.

P.S. You should be careful use goto only from same or more deep scopes and never jump variable declaration.

SQL Server Linked Server Example Query

Following Query is work best.

Try this Query:

SELECT * FROM OPENQUERY([LINKED_SERVER_NAME], 'SELECT * FROM [DATABASE_NAME].[SCHEMA].[TABLE_NAME]')

It Very helps to link MySQL to MS SQL

How to break long string to multiple lines

You cannot use the VB line-continuation character inside of a string.

SqlQueryString = "Insert into Employee values(" & txtEmployeeNo.Value & _
"','" & txtContractStartDate.Value &  _
"','" & txtSeatNo.Value & _
"','" & txtFloor.Value & "','" & txtLeaves.Value & "')"

How to customize listview using baseadapter

Create your own BaseAdapter class and use it as following.

 public class NotificationScreen extends Activity
{

@Override
protected void onCreate_Impl(Bundle savedInstanceState)
{
    setContentView(R.layout.notification_screen);

    ListView notificationList = (ListView) findViewById(R.id.notification_list);
    NotiFicationListAdapter notiFicationListAdapter = new NotiFicationListAdapter();
    notificationList.setAdapter(notiFicationListAdapter);

    homeButton = (Button) findViewById(R.id.home_button);

}

}

Make your own BaseAdapter class and its separate xml file.

public class NotiFicationListAdapter  extends BaseAdapter
{
private ArrayList<HashMap<String, String>> data;
private LayoutInflater inflater=null;


public NotiFicationListAdapter(ArrayList data)
{
this.data=data;        
    inflater =(LayoutInflater)baseActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}



public int getCount() 
{
 return data.size();
}



public Object getItem(int position) 
{
 return position;
}



public long getItemId(int position) 
{
    return position;
}



public View getView(int position, View convertView, ViewGroup parent) 
{
View vi=convertView;
    if(convertView==null)

    vi = inflater.inflate(R.layout.notification_list_item, null);

    ImageView compleatImageView=(ImageView)vi.findViewById(R.id.complet_image);
    TextView name = (TextView)vi.findViewById(R.id.game_name); // name
    TextView email_id = (TextView)vi.findViewById(R.id.e_mail_id); // email ID
    TextView notification_message = (TextView)vi.findViewById(R.id.notification_message); // notification message



    compleatImageView.setBackgroundResource(R.id.address_book);
    name.setText(data.getIndex(position));
    email_id.setText(data.getIndex(position));
    notification_message.setTextdata.getIndex(position));

    return vi;
}

  }

BaseAdapter xml file.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/inner_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_weight="4"
android:background="@drawable/list_view_frame"
android:gravity="center_vertical"
android:padding="5dp" >

<TextView
    android:id="@+id/game_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Game name"
    android:textColor="#FFFFFF"
    android:textSize="15dip"
    android:textStyle="bold"
    android:typeface="sans" />

<TextView
    android:id="@+id/e_mail_id"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/game_name"
    android:layout_marginTop="1dip"
    android:text="E-Mail Id"
    android:textColor="#FFFFFF"
    android:textSize="10dip" />

<TextView
    android:id="@+id/notification_message"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/game_name"
    android:layout_toRightOf="@id/e_mail_id"
    android:paddingLeft="5dp"
    android:text="Notification message"
    android:textColor="#FFFFFF"
    android:textSize="10dip" />



<ImageView
    android:id="@+id/complet_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:layout_marginBottom="30dp"
    android:layout_marginRight="10dp"
    android:src="@drawable/complete_tag"
    android:visibility="invisible" />

</RelativeLayout>

Change it accordingly and use.

pandas unique values multiple columns

here's another way


import numpy as np
set(np.concatenate(df.values))

Materialize CSS - Select Doesn't Seem to Render

First, make sure you initialize it in document.ready like this:

$(document).ready(function () {
    $('select').material_select();
});

Then, populate it with your data in the way you want. My example:

    function FillMySelect(myCustomData) {
       $("#mySelect").html('');

        $.each(myCustomData, function (key, value) {
           $("#mySelect").append("<option value='" + value.id+ "'>" + value.name + "</option>");
        });
}

Make sure after you are done with the population, to trigger this contentChanged like this:

$("#mySelect").trigger('contentChanged');

ASP.NET MVC razor: conditional attribute in HTML

Efficiently finding the last line in a text file

If you do know the maximal length of a line, you can do

def getLastLine(fname, maxLineLength=80):
    fp=file(fname, "rb")
    fp.seek(-maxLineLength-1, 2) # 2 means "from the end of the file"
    return fp.readlines()[-1]

This works on my windows machine. But I do not know what happens on other platforms if you open a text file in binary mode. The binary mode is needed if you want to use seek().

Error CS2001: Source file '.cs' could not be found

They are likely still referenced by the project file. Make sure they are deleted using the Solution Explorer in Visual Studio - it should show them as being missing (with an exclamation mark).

Is it possible to use 'else' in a list comprehension?

To use the else in list comprehensions in python programming you can try out the below snippet. This would resolve your problem, the snippet is tested on python 2.7 and python 3.5.

obj = ["Even" if i%2==0 else "Odd" for i in range(10)]

Getting the name / key of a JToken with JSON.net

JToken is the base class for JObject, JArray, JProperty, JValue, etc. You can use the Children<T>() method to get a filtered list of a JToken's children that are of a certain type, for example JObject. Each JObject has a collection of JProperty objects, which can be accessed via the Properties() method. For each JProperty, you can get its Name. (Of course you can also get the Value if desired, which is another JToken.)

Putting it all together we have:

JArray array = JArray.Parse(json);

foreach (JObject content in array.Children<JObject>())
{
    foreach (JProperty prop in content.Properties())
    {
        Console.WriteLine(prop.Name);
    }
}

Output:

MobileSiteContent
PageContent

Checking if date is weekend PHP

If you're using PHP 5.5 or PHP 7 above, you may want to use:

function isTodayWeekend() {
    return in_array(date("l"), ["Saturday", "Sunday"]);
}

and it will return "true" if today is weekend and "false" if not.

Hash function that produces short hashes?

Just summarizing an answer that was helpful to me (noting @erasmospunk's comment about using base-64 encoding). My goal was to have a short string that was mostly unique...

I'm no expert, so please correct this if it has any glaring errors (in Python again like the accepted answer):

import base64
import hashlib
import uuid

unique_id = uuid.uuid4()
# unique_id = UUID('8da617a7-0bd6-4cce-ae49-5d31f2a5a35f')

hash = hashlib.sha1(str(unique_id).encode("UTF-8"))
# hash.hexdigest() = '882efb0f24a03938e5898aa6b69df2038a2c3f0e'

result = base64.b64encode(hash.digest())
# result = b'iC77DySgOTjliYqmtp3yA4osPw4='

The result here is using more than just hex characters (what you'd get if you used hash.hexdigest()) so it's less likely to have a collision (that is, should be safer to truncate than a hex digest).

Note: Using UUID4 (random). See http://en.wikipedia.org/wiki/Universally_unique_identifier for the other types.

What is the size of column of int(11) in mysql in bytes?

An INT will always be 4 bytes no matter what length is specified.

TINYINT = 1 byte (8 bit)
SMALLINT = 2 bytes (16 bit)
MEDIUMINT = 3 bytes (24 bit)
INT = 4 bytes (32 bit)
BIGINT = 8 bytes (64 bit).

The length just specifies how many characters to pad when selecting data with the mysql command line client. 12345 stored as int(3) will still show as 12345, but if it was stored as int(10) it would still display as 12345, but you would have the option to pad the first five digits. For example, if you added ZEROFILL it would display as 0000012345.

... and the maximum value will be 2147483647 (Signed) or 4294967295 (Unsigned)

How to check programmatically if an application is installed or not in Android?

Try this

This code is used to check weather your application with package name is installed or not if not then it will open playstore link of your app otherwise your installed app

String your_apppackagename="com.app.testing";
    PackageManager packageManager = getPackageManager();
    ApplicationInfo applicationInfo = null;
    try {
        applicationInfo = packageManager.getApplicationInfo(your_apppackagename, 0);
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    if (applicationInfo == null) {
        // not installed it will open your app directly on playstore
        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + your_apppackagename)));
    } else {
        // Installed
        Intent LaunchIntent = packageManager.getLaunchIntentForPackage(your_apppackagename);
        startActivity( LaunchIntent );
    }

no suitable HttpMessageConverter found for response type

You could also simply tell your RestTemplate to accept all media types:

@Bean
public RestTemplate restTemplate() {
   final RestTemplate restTemplate = new RestTemplate();

   List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
   MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
   converter.setSupportedMediaTypes(Collections.singletonList(MediaType.ALL));
   messageConverters.add(converter);
   restTemplate.setMessageConverters(messageConverters);

   return restTemplate;
}

Updating a java map entry

Use

table.put(key, val);

to add a new key/value pair or overwrite an existing key's value.

From the Javadocs:

V put(K key, V value): Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)

How to fire an event when v-model changes?

You should use @input:

<input @input="handleInput" />

@input fires when user changes input value.

@change fires when user changed value and unfocus input (for example clicked somewhere outside)

You can see the difference here: https://jsfiddle.net/posva/oqe9e8pb/

how to use json file in html code

You can use JavaScript like... Just give the proper path of your json file...

<!doctype html>
<html>
    <head>
        <script type="text/javascript" src="abc.json"></script>
        <script type="text/javascript" >
            function load() {
                var mydata = JSON.parse(data);
                alert(mydata.length);

                var div = document.getElementById('data');

                for(var i = 0;i < mydata.length; i++)
                {
                    div.innerHTML = div.innerHTML + "<p class='inner' id="+i+">"+ mydata[i].name +"</p>" + "<br>";
                }
            }
        </script>
    </head>
    <body onload="load()">
        <div id="data">

        </div>
    </body>
</html>

Simply getting the data and appending it to a div... Initially printing the length in alert.

Here is my Json file: abc.json

data = '[{"name" : "Riyaz"},{"name" : "Javed"},{"name" : "Arun"},{"name" : "Sunil"},{"name" : "Rahul"},{"name" : "Anita"}]';

Padding characters in printf

Simple Console Span/Fill/Pad/Padding with automatic scaling/resizing Method and Example.

function create-console-spanner() {
    # 1: left-side-text, 2: right-side-text
    local spanner="";
    eval printf -v spanner \'"%0.1s"\' "-"{1..$[$(tput cols)- 2 - ${#1} - ${#2}]}
    printf "%s %s %s" "$1" "$spanner" "$2";
}

Example: create-console-spanner "loading graphics module" "[success]"

Now here is a full-featured-color-character-terminal-suite that does everything in regards to printing a color and style formatted string with a spanner.

# Author: Triston J. Taylor <[email protected]>
# Date: Friday, October 19th, 2018
# License: OPEN-SOURCE/ANY (NO-PRODUCT-LIABILITY OR WARRANTIES)
# Title: paint.sh
# Description: color character terminal driver/controller/suite

declare -A PAINT=([none]=`tput sgr0` [bold]=`tput bold` [black]=`tput setaf 0` [red]=`tput setaf 1` [green]=`tput setaf 2` [yellow]=`tput setaf 3` [blue]=`tput setaf 4` [magenta]=`tput setaf 5` [cyan]=`tput setaf 6` [white]=`tput setaf 7`);

declare -i PAINT_ACTIVE=1;

function paint-replace() {
    local contents=$(cat)
    echo "${contents//$1/$2}"
}

source <(cat <<EOF
function paint-activate() {
    echo "\$@" | $(for k in ${!PAINT[@]}; do echo -n paint-replace \"\&$k\;\" \"\${PAINT[$k]}\" \|; done) cat;
}
EOF
)

source <(cat <<EOF
function paint-deactivate(){
    echo "\$@" | $(for k in ${!PAINT[@]}; do echo -n paint-replace \"\&$k\;\" \"\" \|; done) cat;    
}
EOF
)

function paint-get-spanner() {
    (( $# == 0 )) && set -- - 0;
    declare -i l=$(( `tput cols` - ${2}))
    eval printf \'"%0.1s"\' "${1:0:1}"{1..$l}
}

function paint-span() {
    local left_format=$1 right_format=$3
    local left_length=$(paint-format -l "$left_format") right_length=$(paint-format -l "$right_format")
    paint-format "$left_format";
    paint-get-spanner "$2" $(( left_length + right_length));
    paint-format "$right_format";
}

function paint-format() {
    local VAR="" OPTIONS='';
    local -i MODE=0 PRINT_FILE=0 PRINT_VAR=1 PRINT_SIZE=2;
    while [[ "${1:0:2}" =~ ^-[vl]$ ]]; do
        if [[ "$1" == "-v" ]]; then OPTIONS=" -v $2"; MODE=$PRINT_VAR; shift 2; continue; fi;
        if [[ "$1" == "-l" ]]; then OPTIONS=" -v VAR"; MODE=$PRINT_SIZE; shift 1; continue; fi;
    done;
    OPTIONS+=" --"
    local format="$1"; shift;
    if (( MODE != PRINT_SIZE && PAINT_ACTIVE )); then
        format=$(paint-activate "$format&none;")
    else
        format=$(paint-deactivate "$format")
    fi
    printf $OPTIONS "${format}" "$@";
    (( MODE == PRINT_SIZE )) && printf "%i\n" "${#VAR}" || true;
}

function paint-show-pallette() {
    local -i PAINT_ACTIVE=1
    paint-format "Normal: &red;red &green;green &blue;blue &magenta;magenta &yellow;yellow &cyan;cyan &white;white &black;black\n";
    paint-format "  Bold: &bold;&red;red &green;green &blue;blue &magenta;magenta &yellow;yellow &cyan;cyan &white;white &black;black\n";
}

To print a color, that's simple enough: paint-format "&red;This is %s\n" red And you might want to get bold later on: paint-format "&bold;%s!\n" WOW

The -l option to the paint-format function measures the text so you can do console font metrics operations.

The -v option to the paint-format function works the same as printf but cannot be supplied with -l

Now for the spanning!

paint-span "hello " . " &blue;world" [note: we didn't add newline terminal sequence, but the text fills the terminal, so the next line only appears to be a newline terminal sequence]

and the output of that is:

hello ............................. world

ActionBarActivity cannot resolve a symbol

Make sure that in the path to the project there is no foldername having whitespace. While creating a project the specified path folders must not contain any space in their naming.

ICommand MVVM implementation

I've just created a little example showing how to implement commands in convention over configuration style. However it requires Reflection.Emit() to be available. The supporting code may seem a little weird but once written it can be used many times.

Teaser:

public class SampleViewModel: BaseViewModelStub
{
    public string Name { get; set; }

    [UiCommand]
    public void HelloWorld()
    {
        MessageBox.Show("Hello World!");
    }

    [UiCommand]
    public void Print()
    {
        MessageBox.Show(String.Concat("Hello, ", Name, "!"), "SampleViewModel");
    }

    public bool CanPrint()
    {
        return !String.IsNullOrEmpty(Name);
    }
}

}

UPDATE: now there seem to exist some libraries like http://www.codeproject.com/Articles/101881/Executing-Command-Logic-in-a-View-Model that solve the problem of ICommand boilerplate code.

Upgrading React version and it's dependencies by reading package.json

if you want to update your react and react-dom version in your existing react step then run this command I hope You get the latest version of react and react-dom.

Thanks

npm install react@latest react-dom@latest

How to resolve this System.IO.FileNotFoundException

I hate to point out the obvious, but System.IO.FileNotFoundException means the program did not find the file you specified. So what you need to do is check what file your code is looking for in production.

To see what file your program is looking for in production (look at the FileName property of the exception), try these techniques:

Then look at the file system on the machine and see if the file exists. Most likely the case is that it doesn't exist.

What's the best way to add a full screen background image in React Native

An another easy solution:

<Image source={require('../assets/background.png')}
      style={{position: 'absolute', zIndex: -1}}/>

<View style={{flex: 1, position: 'absolute'}}>

  {/*rest of your content*/}
</View>

Rolling or sliding window iterator?

This is an old question but for those still interested there is a great implementation of a window slider using generators in this page (by Adrian Rosebrock).

It is an implementation for OpenCV however you can easily use it for any other purpose. For the eager ones i'll paste the code here but to understand it better I recommend visiting the original page.

def sliding_window(image, stepSize, windowSize):
    # slide a window across the image
    for y in xrange(0, image.shape[0], stepSize):
        for x in xrange(0, image.shape[1], stepSize):
            # yield the current window
            yield (x, y, image[y:y + windowSize[1], x:x + windowSize[0]])

Tip: You can check the .shape of the window when iterating the generator to discard those that do not meet your requirements

Cheers

Update R using RStudio

Just restart R Studio after installing the new version of R. To confirm you're on the new version, >version and you should see the new details.

Getting the length of two-dimensional array

which 3?

You've created a multi-dimentional array. nir is an array of int arrays; you've got two arrays of length three.

System.out.println(nir[0].length);

would give you the length of your first array.

Also worth noting is that you don't have to initialize a multi-dimensional array as you did, which means all the arrays don't have to be the same length (or exist at all).

int nir[][] = new int[5][];
nir[0] = new int[5];
nir[1] = new int[3];
System.out.println(nir[0].length); // 5
System.out.println(nir[1].length); // 3
System.out.println(nir[2].length); // Null pointer exception

How can I add an item to a IEnumerable<T> collection?

Sure, you can (I am leaving your T-business aside):

public IEnumerable<string> tryAdd(IEnumerable<string> items)
{
    List<string> list = items.ToList();
    string obj = "";
    list.Add(obj);

    return list.Select(i => i);
}

How to use relative paths without including the context root name?

This could be done simpler:

<base href="${pageContext.request.contextPath}/"/>

All URL will be formed without unnecessary domain:port but with application context.

What's the difference between jquery.js and jquery.min.js?

jquery.js = Pretty and easy to read :) Read this one.
jquery.min.js = Looks like jibberish! But has a smaller file size. Put this one on your site.

Both are the same in functionality. The difference is only in whether it's formatted nicely for readability or compactly for smaller file size.

Specifically, the second one is minified, a process which involves removing unnecessary whitespace and shortening variable names. Both contribute to making the code much harder to read: the removal of whitespace removes line breaks and spaces messing up the formatting, and the shortening of variable names (including some function names) replaces the original variable names with meaningless letters.

All this is done in such a way that it doesn't affect the way the code behaves when run, in any way. Notably, the replacement/shortening of variable and function names is only done to names that appear in a local scope where it won't interfere with any other code in other scripts.

How do I add a user when I'm using Alpine as a base image?

Alpine uses the command adduser and addgroup for creating users and groups (rather than useradd and usergroup).

FROM alpine:latest

# Create a group and user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup

# Tell docker that all future commands should run as the appuser user
USER appuser

The flags for adduser are:

Usage: adduser [OPTIONS] USER [GROUP]

Create new user, or add USER to GROUP

        -h DIR          Home directory
        -g GECOS        GECOS field
        -s SHELL        Login shell
        -G GRP          Group
        -S              Create a system user
        -D              Don't assign a password
        -H              Don't create home directory
        -u UID          User id
        -k SKEL         Skeleton directory (/etc/skel)

Add new user official docs

Is there a way to follow redirects with command line cURL?

Use the location header flag:

curl -L <URL>

How to save a plot into a PDF file without a large margin around

The script in How to get rid of the white margin in MATLAB's saveas or print outputs does what you want.

Make your figure boundaries tight:

ti = get(gca,'TightInset')
set(gca,'Position',[ti(1) ti(2) 1-ti(3)-ti(1) 1-ti(4)-ti(2)]);

... if you directly do saveas (or print), MATLAB will still add the annoying white space. To get rid of them, we need to adjust the ``paper size":

set(gca,'units','centimeters')
pos = get(gca,'Position');
ti = get(gca,'TightInset');

set(gcf, 'PaperUnits','centimeters');
set(gcf, 'PaperSize', [pos(3)+ti(1)+ti(3) pos(4)+ti(2)+ti(4)]);
set(gcf, 'PaperPositionMode', 'manual');
set(gcf, 'PaperPosition',[0 0 pos(3)+ti(1)+ti(3) pos(4)+ti(2)+ti(4)]);

XML Parsing - Read a Simple XML File and Retrieve Values

Easy way to parse the xml is to use the LINQ to XML

for example you have the following xml file

<library>
    <track id="1" genre="Rap" time="3:24">
        <name>Who We Be RMX (feat. 2Pac)</name>
        <artist>DMX</artist>
        <album>The Dogz Mixtape: Who's Next?!</album>
    </track>
    <track id="2" genre="Rap" time="5:06">
        <name>Angel (ft. Regina Bell)</name>
        <artist>DMX</artist>
        <album>...And Then There Was X</album>
    </track>
    <track id="3" genre="Break Beat" time="6:16">
        <name>Dreaming Your Dreams</name>
        <artist>Hybrid</artist>
        <album>Wide Angle</album>
    </track>
    <track id="4" genre="Break Beat" time="9:38">
        <name>Finished Symphony</name>
        <artist>Hybrid</artist>
        <album>Wide Angle</album>
    </track>
<library>

For reading this file, you can use the following code:

public void Read(string  fileName)
{
    XDocument doc = XDocument.Load(fileName);

    foreach (XElement el in doc.Root.Elements())
    {
        Console.WriteLine("{0} {1}", el.Name, el.Attribute("id").Value);
        Console.WriteLine("  Attributes:");
        foreach (XAttribute attr in el.Attributes())
            Console.WriteLine("    {0}", attr);
        Console.WriteLine("  Elements:");

        foreach (XElement element in el.Elements())
            Console.WriteLine("    {0}: {1}", element.Name, element.Value);
    }
}

Check if a string contains a number

Also, you could use regex findall. It's a more general solution since it adds more control over the length of the number. It could be helpful in cases where you require a number with minimal length.

True if len(''.join(re.findall('\d+', '67389kjsdk'))) > 0 else False

Hope it helps some else.

how to restart only certain processes using supervisorctl?

What is The Rule of Three?

The Rule of Three is a rule of thumb for C++, basically saying

If your class needs any of

a copy constructor,

an assignment operator,

or a destructor,

defined explictly, then it is likely to need all three of them.

The reasons for this is that all three of them are usually used to manage a resource, and if your class manages a resource, it usually needs to manage copying as well as freeing.

If there is no good semantic for copying the resource your class manages, then consider to forbid copying by declaring (not defining) the copy constructor and assignment operator as private.

(Note that the forthcoming new version of the C++ standard (which is C++11) adds move semantics to C++, which will likely change the Rule of Three. However, I know too little about this to write a C++11 section about the Rule of Three.)

Getting Serial Port Information

this.comboPortName.Items.AddRange(
    (from qP in System.IO.Ports.SerialPort.GetPortNames()
     orderby System.Text.RegularExpressions.Regex.Replace(qP, "~\\d",
     string.Empty).PadLeft(6, '0')
     select qP).ToArray()
);

sql server invalid object name - but tables are listed in SSMS tables list

Ctrl + Shift + R refreshes intellisense in management studio 2008 as well.

VBA - If a cell in column A is not blank the column B equals

Another way (Using Formulas in VBA). I guess this is the shortest VBA code as well?

Sub Sample()
    Dim ws As Worksheet
    Dim lRow As Long

    Set ws = ThisWorkbook.Sheets("Sheet1")

    With ws
        lRow = .Range("A" & .Rows.Count).End(xlUp).Row

        .Range("B1:B" & lRow).Formula = "=If(A1<>"""",""My Text"","""")"
        .Range("B1:B" & lRow).Value = .Range("B1:B" & lRow).Value
    End With
End Sub

How can I create an MSI setup?

In my opinion you should use Wix#, which nicely hides most of the complexity of building an MSI installation pacakge.

It allows you to perform all possible kinds of customization using a more easier language compared to WiX.

How to call a function within class?

That doesn't work because distToPoint is inside your class, so you need to prefix it with the classname if you want to refer to it, like this: classname.distToPoint(self, p). You shouldn't do it like that, though. A better way to do it is to refer to the method directly through the class instance (which is the first argument of a class method), like so: self.distToPoint(p).

isset in jQuery?

if (($("#one").length > 0)){
   alert('yes');
}

if (($("#two").length > 0)){
   alert('yes');
}

if (($("#three").length > 0)){
   alert('yes');
}

if (($("#four")).length == 0){
   alert('no');
}

This is what you need :)

Insert new column into table in sqlite?

I was facing the same problem and the second method proposed in the accepted answer, as noted in the comments, can be problematic when dealing with foreign keys.

My workaround is to export the database to a sql file making sure that the INSERT statements include column names. I do it using DB Browser for SQLite which has an handy feature for that. After that you just have to edit the create table statement and insert the new column where you want it and recreate the db.

In *nix like systems is just something along the lines of

cat db.sql | sqlite3 database.db

I don't know how feasible this is with very big databases, but it worked in my case.

Is it possible to install another version of Python to Virtualenv?

I'm using virtualenvwrapper and don't want to modify $PATH, here's how:

$ which python3
/usr/local/bin/python3

$ mkvirtualenv --python=/usr/local/bin/python3 env_name

How to initialize a vector in C++

You can also do like this:

template <typename T>
class make_vector {
public:
  typedef make_vector<T> my_type;
  my_type& operator<< (const T& val) {
    data_.push_back(val);
    return *this;
  }
  operator std::vector<T>() const {
    return data_;
  }
private:
  std::vector<T> data_;
};

And use it like this:

std::vector<int> v = make_vector<int>() << 1 << 2 << 3;

Media query to detect if device is touchscreen

This solution will work until CSS4 is globally supported by all browsers. When that day comes just use CSS4. but until then, this works for current browsers.

browser-util.js

export const isMobile = {
  android: () => navigator.userAgent.match(/Android/i),
  blackberry: () => navigator.userAgent.match(/BlackBerry/i),
  ios: () => navigator.userAgent.match(/iPhone|iPad|iPod/i),
  opera: () => navigator.userAgent.match(/Opera Mini/i),
  windows: () => navigator.userAgent.match(/IEMobile/i),
  any: () => (isMobile.android() || isMobile.blackberry() || 
  isMobile.ios() || isMobile.opera() || isMobile.windows())
};

onload:

old way:

isMobile.any() ? document.getElementsByTagName("body")[0].className += 'is-touch' : null;

newer way:

isMobile.any() ? document.body.classList.add('is-touch') : null;

The above code will add the "is-touch" class to the body tag if the device has a touch screen. Now any location in your web application where you would have css for :hover you can call body:not(.is-touch) the_rest_of_my_css:hover

for example:

button:hover

becomes:

body:not(.is-touch) button:hover

This solution avoids using modernizer as the modernizer lib is a very big library. If all you're trying to do is detect touch screens, This will be best when the size of the final compiled source is a requirement.

Set the absolute position of a view

Just to add to Andy Zhang's answer above, if you want to, you can give param to rl.addView, then make changes to it later, so:

params = new RelativeLayout.LayoutParams(30, 40);
params.leftMargin = 50;
params.topMargin = 60;
rl.addView(iv, params);

Could equally well be written as:

params = new RelativeLayout.LayoutParams(30, 40);
rl.addView(iv, params);
params.leftMargin = 50;
params.topMargin = 60;

So if you retain the params variable, you can change the layout of iv at any time after adding it to rl.

INSTALL_FAILED_UPDATE_INCOMPATIBLE when I try to install compiled .apk on device

The question was why he's getting this error. Uninstalling will solve this problem but in my case, while I was installing the compiled version of the apk, the problem raised. I was trying to build an update for my application. So what I did, I built a signed apk and then tried to install the apk and the apk installed perfectly. So, rather removing the old apk, I had to sign the newer update and then installed it.

Browserslist: caniuse-lite is outdated. Please run next command `npm update caniuse-lite browserslist`

If you use yarn:

yarn upgrade

Help for me

C pass int array pointer as parameter into a function

Make use of *(B) instead of *B[0]. Here, *(B+i) implies B[i] and *(B) implies B[0], that is
*(B+0)=*(B)=B[0].

#include <stdio.h>

int func(int *B){
    *B = 5;     
    // if you want to modify ith index element in the array just do *(B+i)=<value>
}

int main(void){

    int B[10] = {};
    printf("b[0] = %d\n\n", B[0]);
    func(B);
    printf("b[0] = %d\n\n", B[0]);
    return 0;
}

How can one run multiple versions of PHP 5.x on a development LAMP server?

Understanding that you're probably talking about a local/desktop machine and would probably like to continue talking about a local/desktop machine, I'll throw an alternative out there for you just in case it might help you or someone else:

Set up multiple virtual server instances in the cloud, and share your code between them as a git repository (or mercurial, I suppose, though I have no personal experience all you really need is something decentralized). This has the benefit of giving you as close to a production experience as possible, and if you have experience setting up servers then it's not that complicated (or expensive, if you just want to spin a server up, do what you need to do, then spin it down again, then you're talking about a few cents up to say 50 cents, up to a few bucks if you just leave it running).

I do all of my project development in the cloud these days and I've found it much simpler to manage the infrastructure than I ever did when using local/non-virtualized installs, and it makes this sort of side-by-side scenario fairly straight forward. I just wanted to throw the idea out there if you hadn't considered it.

Style bottom Line in Android

It's kind of a hack, but I think this is probably the best way to do it. The dashed line will always be on the bottom, regardless of the height.

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <shape android:shape="rectangle" >
            <solid android:color="#1bd4f6" />
        </shape>
    </item>

    <item android:top="-2dp" android:right="-2dp" android:left="-2dp">
        <shape>
            <solid android:color="@android:color/transparent" />
            <stroke
                android:dashGap="10px"
                android:dashWidth="10px"
                android:width="1dp"
                android:color="#ababb2" />
        </shape>
    </item>

</layer-list>

Explanation:

The second shape is transparent rectangle with a dashed outline. The key in making the border only appear along the bottom lies in the negative margins set the other sides. These negative margins "push" the dashed line outside the drawn area on those sides, leaving only the line along the bottom. One potential side-effect (which I haven't tried) is that, for views that draw outside their own bounds, the negative-margin borders may become visible.

'xmlParseEntityRef: no name' warnings while loading xml into a php file

The XML is most probably invalid.

The problem could be the "&"

$text=preg_replace('/&(?!#?[a-z0-9]+;)/', '&amp;', $text);

will get rid of the "&" and replace it with it's HTML code version...give it a try.

javascript set cookie with expire time

Below are code snippets to create and delete a cookie. The cookie is set for 1 day.

// 1 Day = 24 Hrs = 24*60*60 = 86400.

By using max-age:

Creating the cookie:

document.cookie = "cookieName=cookieValue; max-age=86400; path=/;";

Deleting the cookie:

document.cookie = "cookieName=; max-age=- (any digit); path=/;";

By using expires:

Syntax for creating the cookie for one day:

var expires = (new Date(Date.now()+ 86400*1000)).toUTCString();
document.cookie = "cookieName=cookieValue; expires=" + expires + 86400) + ";path=/;"

Using Tempdata in ASP.NET MVC - Best practice

Please note that MVC 3 onwards the persistence behavior of TempData has changed, now the value in TempData is persisted until it is read, and not just for the next request.

The value of TempData persists until it is read or until the session times out. Persisting TempData in this way enables scenarios such as redirection, because the values in TempData are available beyond a single request. https://msdn.microsoft.com/en-in/library/dd394711%28v=vs.100%29.aspx

Get content uri from file path in android

Its late, but may help someone in future.

To get content URI for a file, you may use the following method:

FileProvider.getUriForFile(Context context, String authority, File file)

It returns the content URI.

Check this out to learn how to setup a FileProvider

How do I vertical center text next to an image in html/css?

There are a couple of options:

You can use line-height and make sure it is tall as the containing element
Use display: table-cell and vertical align: middle

My preferred option would be the first one, if it's a short space, or the latter otherwise.

Javascript counting number of objects in object

Try Demo Here

var list ={}; var count= Object.keys(list).length;

How can I connect to MySQL in Python 3 on Windows?

Untested, but there are some binaries available at:

Unofficial Windows Binaries

How to link C++ program with Boost using CMake

The following is my configuration:

cmake_minimum_required(VERSION 2.8)
set(Boost_INCLUDE_DIR /usr/local/src/boost_1_46_1)
set(Boost_LIBRARY_DIR /usr/local/src/boost_1_46_1/stage/lib)
find_package(Boost COMPONENTS system filesystem REQUIRED)
include_directories(${Boost_INCLUDE_DIR})
link_directories(${Boost_LIBRARY_DIR})

add_executable(main main.cpp)
target_link_libraries( main ${Boost_LIBRARIES} )

php create object without class

you can always use new stdClass(). Example code:

   $object = new stdClass();
   $object->property = 'Here we go';

   var_dump($object);
   /*
   outputs:

   object(stdClass)#2 (1) {
      ["property"]=>
      string(10) "Here we go"
    }
   */

Also as of PHP 5.4 you can get same output with:

$object = (object) ['property' => 'Here we go'];

Visual Studio 2010 - recommended extensions

Visual Assist X(not free)

How do I detect a page refresh using jquery?

There are two events on client side as given below.

1. window.onbeforeunload (calls on Browser/tab Close & Page Load)

2. window.onload (calls on Page Load)

On server Side

public JsonResult TestAjax( string IsRefresh)
    {
        JsonResult result = new JsonResult();
        return result = Json("Called", JsonRequestBehavior.AllowGet);
    }

On Client Side

_x000D_

 <script type="text/javascript">_x000D_
    window.onbeforeunload = function (e) {_x000D_
        _x000D_
        $.ajax({_x000D_
            type: 'GET',_x000D_
            async: false,_x000D_
            url: '/Home/TestAjax',_x000D_
            data: { IsRefresh: 'Close' }_x000D_
        });_x000D_
    };_x000D_
_x000D_
    window.onload = function (e) {_x000D_
_x000D_
        $.ajax({_x000D_
            type: 'GET',_x000D_
            async: false,_x000D_
            url: '/Home/TestAjax',_x000D_
            data: {IsRefresh:'Load'}_x000D_
        });_x000D_
    };_x000D_
</script>

_x000D_

On Browser/Tab Close: if user close the Browser/tab, then window.onbeforeunload will fire and IsRefresh value on server side will be "Close".

On Refresh/Reload/F5: If user will refresh the page, first window.onbeforeunload will fire with IsRefresh value = "Close" and then window.onload will fire with IsRefresh value = "Load", so now you can determine at last that your page is refreshing.

How to make picturebox transparent?

Just use the Form Paint method and draw every Picturebox on it, it allows transparency :

    private void frmGame_Paint(object sender, PaintEventArgs e)
    {
        DoubleBuffered = true;
        for (int i = 0; i < Controls.Count; i++)
            if (Controls[i].GetType() == typeof(PictureBox))
            {
                var p = Controls[i] as PictureBox;
                p.Visible = false;
                e.Graphics.DrawImage(p.Image, p.Left, p.Top, p.Width, p.Height);
            }
    }

Disabled UIButton not faded or grey

You can use the both first answers and is going to be a better result.

In the attribute inspector (when you're selecting the button), change the State Config to Disabled to set the new Image that is going to appear when it is disabled (remove the marker in the Content->Enabled check to made it disabled).

And when you change the state to enabled, the image will load the one from this state.

Adding the alpha logic to this is a good detail.

How to Navigate from one View Controller to another using Swift

In swift 3

let nextVC = self.storyboard?.instantiateViewController(withIdentifier: "NextViewController") as! NextViewController        
self.navigationController?.pushViewController(nextVC, animated: true)

Node.js getaddrinfo ENOTFOUND

My problem was that my OS X (Mavericks) DNS service needed to be rebooted.

Can you change what a symlink points to after it is created?

It is not necessary to explicitly unlink the old symlink. You can do this:

ln -s newtarget temp
mv temp mylink

(or use the equivalent symlink and rename calls). This is better than explicitly unlinking because rename is atomic, so you can be assured that the link will always point to either the old or new target. However this will not reuse the original inode.

On some filesystems, the target of the symlink is stored in the inode itself (in place of the block list) if it is short enough; this is determined at the time it is created.

Regarding the assertion that the actual owner and group are immaterial, symlink(7) on Linux says that there is a case where it is significant:

The owner and group of an existing symbolic link can be changed using lchown(2). The only time that the ownership of a symbolic link matters is when the link is being removed or renamed in a directory that has the sticky bit set (see stat(2)).

The last access and last modification timestamps of a symbolic link can be changed using utimensat(2) or lutimes(3).

On Linux, the permissions of a symbolic link are not used in any operations; the permissions are always 0777 (read, write, and execute for all user categories), and can't be changed.

ssh server connect to host xxx port 22: Connection timed out on linux-ubuntu

I got this error and found that I don't have my SSH port (non standard number) whitelisted in config server firewall.

How to use in jQuery :not and hasClass() to get a specific element without a class

jQuery's hasClass() method returns a boolean (true/false) and not an element. Also, the parameter to be given to it is a class name and not a selector as such.

For ex: x.hasClass('error');

alter the size of column in table containing data

Case 1 : Yes, this works fine.

Case 2 : This will fail with the error ORA-01441 : cannot decrease column length because some value is too big.

Share and enjoy.

web-api POST body object always null

I used HttpRequestMessage and my problem got solved after doing so much research

[HttpPost]
public HttpResponseMessage PostProcedure(HttpRequestMessage req){
...
}

PHP function use variable from outside

I suppose this depends on your architecture and whatever else you may need to consider, but you could also take the object-oriented approach and use a class.

class ClassName {

    private $site_url;

    function __construct( $url ) {
        $this->site_url = $url;
    }

    public function parts( string $part ) {
        echo 'http://' . $this->site_url . 'content/' . $part . '.php';
    }

    # You could build a bunch of other things here
    # too and still have access to $this->site_url.
}

Then you can create and use the object wherever you'd like.

$obj = new ClassName($site_url);
$obj->parts('part_argument');

This could be overkill for what OP was specifically trying to achieve, but it's at least an option I wanted to put on the table for newcomers since nobody mentioned it yet.

The advantage here is scalability and containment. For example, if you find yourself needing to pass the same variables as references to multiple functions for the sake of a common task, that could be an indicator that a class is in order.

SQL Server - Convert date field to UTC

If they're all local to you, then here's the offset:

SELECT GETDATE() AS CurrentTime, GETUTCDATE() AS UTCTime

and you should be able to update all the data using:

UPDATE SomeTable
   SET DateTimeStamp = DATEADD(hh, DATEDIFF(hh, GETDATE(), GETUTCDATE()), DateTimeStamp)

Would that work, or am I missing another angle of this problem?

How can you speed up Eclipse?

                       **Tips for making Eclipse IDE Faster**

Eclipse will run faster when working with small projects. But when you have to work with large project, you will get irritated with its speed. Even with a huge RAM you will not be happy with its speed.Below steps will help eclipse to increase its speed

Remove unwanted activation of some of the plugins at start-up by going to windows–>preference–>General–>Startup and shutdown also make sure you don’t use those plugins in any of your views
Disabling label decorations which is of less use for you, will also help you to gain some performance . Go to Windows–>Preference–>General–>Appearance–>Label -> Decorations
Close unwanted projects and use working set option to move from one group of project to another smoothly.
Configure eclipse.ini which will be available in the eclipse installed location.

   Configuring eclipse.ini should be based on your RAM
   -Xms256m
   -Xmx512m
   -XX:PermSize=512m
   -XX:MaxPermSize=512M

Also have a look at http://wiki.eclipse.org/Eclipse.ini for more options to configure eclipse.ini.

Do not keep lot of tabs opened in the editor. Better to have around 20 tabs . Regularly close the unused tabs. To open resource we can always use ctrl+shift+R and ctrl+shift+T (java resource) instead of opening lot of tabs I experienced a considerable improvement in performance when limiting the number of open tabs (In the past I frequently had 30+ tabs open). You can let eclipse handle this for you automatically: Window->Preferences->Editors-> close editors automatically 8 open tabs is the amount before the >> sign appears, so I set 14 as my default value. When opening more tabs, the ones the least recently accessed will be closed. When all editors are dirty or pinned. If it has unsaved modifications you can prompt to save & reuse (tab will be closed, a new one will be opened in its place). Or you can open a new editor end thus increase the amount of open tabs (the unobtrusive choice). If you want to ensure some tabs never get closed autmatically, you can pin them. This by clicking on the pin icon (the rightmost icon in the toolbar, with “pin editor” as tooltiptext).
Go to Windows -> Preferences -> Validation and uncheck any validators you don’t want or need.
Go to Windows -> Preferences -> General -> Appearance -> and uncheck any animation you don’t want or need.
Go to Windows -> Preferences -> Maven and check 'do not automatically update dependencies'.

Return row number(s) for a particular value in a column in a dataframe

Use which(mydata_2$height_chad1 == 2585)

Short example

df <- data.frame(x = c(1,1,2,3,4,5,6,3),
                 y = c(5,4,6,7,8,3,2,4))
df
  x y
1 1 5
2 1 4
3 2 6
4 3 7
5 4 8
6 5 3
7 6 2
8 3 4

which(df$x == 3)
[1] 4 8

length(which(df$x == 3))
[1] 2

count(df, vars = "x")
  x freq
1 1    2
2 2    1
3 3    2
4 4    1
5 5    1
6 6    1

df[which(df$x == 3),]
  x y
4 3 7
8 3 4

As Matt Weller pointed out, you can use the length function. The count function in plyr can be used to return the count of each unique column value.

To get total number of columns in a table in sql

SELECT COUNT(COLUMN_NAME) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_CATALOG = 'database' AND TABLE_SCHEMA = 'dbo'
AND TABLE_NAME = 'table'

Converting String Array to an Integer Array

Line by line

int [] v = Stream.of(line.split(",\\s+"))
  .mapToInt(Integer::parseInt)
  .toArray();

Java: using switch statement with enum under subclass

Change it to this:

switch (enumExample) {
    case VALUE_A: {
        //..
        break;
    }
}

The clue is in the error. You don't need to qualify case labels with the enum type, just its value.

Validation error: "No validator could be found for type: java.lang.Integer"

As per the javadoc of NotEmpty, Integer is not a valid type for it to check. It's for Strings and collections. If you just want to make sure an Integer has some value, javax.validation.constraints.NotNull is all you need.

public @interface NotEmpty

Asserts that the annotated string, collection, map or array is not null or empty.

How to install an npm package from GitHub directly?

The current top answer by Peter Lyons is not relevant with recent NPM versions. For example, using the same command that was criticized in this answer is now fine.

$ npm install https://github.com/visionmedia/express

If you have continued problems it might be a problem with whatever package you were using.

Setting selection to Nothing when programming Excel

If using a button to call the paste procedure,

try activating the button after the operation. this successfully clears the selection

without

having to mess around with hidden things
selecting another cell (which is exactly the opposite of what was asked)
affecting the clipboard mode
having the hacky method of pressing escape which doesn't always work

HTH

Sub BtnCopypasta_Worksheet_Click()
   range.copy
   range.paste
BtnCopypasta.Activate
End sub

HTH

Java synchronized block vs. Collections.synchronizedMap

That looks correct to me. If I were to change anything, I would stop using the Collections.synchronizedMap() and synchronize everything the same way, just to make it clearer.

Also, I'd replace

  if (synchronizedMap.containsKey(key)) {
    synchronizedMap.get(key).add(value);
  }
  else {
    List<String> valuesList = new ArrayList<String>();
    valuesList.add(value);
    synchronizedMap.put(key, valuesList);
  }

with

List<String> valuesList = synchronziedMap.get(key);
if (valuesList == null)
{
  valuesList = new ArrayList<String>();
  synchronziedMap.put(key, valuesList);
}
valuesList.add(value);

MySQL - sum column value(s) based on row from the same table

This might be seen as a little complex but does exactly what you want

SELECT 
  DISTINCT(p.`ProductID`) AS ProductID,
  SUM(pl.CashAmount) AS Cash,
  SUM(pr.CashAmount) AS `Check`,
  SUM(px.CashAmount) AS `Credit Card`,
  SUM(pl.CashAmount) + SUM(pr.CashAmount) +SUM(px.CashAmount) AS Amount
FROM
  `payments` AS p 
  LEFT JOIN (SELECT ProductID,PaymentMethod , IFNULL(Amount,0) AS CashAmount FROM payments WHERE PaymentMethod = 'Cash' GROUP BY ProductID , PaymentMethod ) AS pl 
    ON pl.`PaymentMethod` = p.`PaymentMethod` AND pl.ProductID = p.`ProductID`
  LEFT JOIN (SELECT ProductID,PaymentMethod , IFNULL(Amount,0) AS CashAmount FROM payments WHERE PaymentMethod = 'Check' GROUP BY ProductID , PaymentMethod) AS pr 
    ON pr.`PaymentMethod` = p.`PaymentMethod` AND pr.ProductID = p.`ProductID`
  LEFT JOIN (SELECT ProductID, PaymentMethod , IFNULL(Amount,0) AS CashAmount FROM payments WHERE PaymentMethod = 'Credit Card' GROUP BY ProductID , PaymentMethod) AS px 
    ON px.`PaymentMethod` = p.`PaymentMethod` AND px.ProductID = p.`ProductID`
GROUP BY p.`ProductID` ;

Output

ProductID | Cash | Check | Credit Card | Amount
-----------------------------------------------
    3     | 20   |  15   |   25        |  60
    4     | 5    |  6    |   7         |  18

SQL Fiddle Demo

How to resize datagridview control when form resizes

If anyone else is stuck with this, here's what helped me. Changing the Anchor settings did not work for me. I am using datagridviews within groupboxes in a form which is inside a parent form.

Handling the form resize event was the only thing that worked for me.

private void Form1_Resize(object sender, EventArgs e)
{
     groupBoxSampleQueue.MinimumSize = new Size((this as OperatingForm).Width - 22, 167);
     groupBoxMachineStatus.MinimumSize = new Size((this as OperatingForm).Width - 22, 167);
}

I added some raw numbers as buffers.

Android:java.lang.OutOfMemoryError: Failed to allocate a 23970828 byte allocation with 2097152 free bytes and 2MB until OOM

Bitmap image =((BitmapDrawable)imageView1.getDrawable()).getBitmap();

ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();

image.compress(Bitmap.CompressFormat.JPEG,50/100,byteArrayOutputStream);

50/100 if one uses 100 then original resolution can stopped the Apps for out of memory.

if 50 or less than 100 this will be 50% or less than 100 resolution so this will prevent from out of memory problem

Formatting ISODate from Mongodb

you can use mongo query like this yearMonthDayhms: { $dateToString: { format: "%Y-%m-%d-%H-%M-%S", date: {$subtract:["$cdt",14400000]}}}

HourMinute: { $dateToString: { format: "%H-%M-%S", date: {$subtract:["$cdt",14400000]}}}

How to make CREATE OR REPLACE VIEW work in SQL Server?

Here is another method, where you don't have to duplicate the contents of the view:

IF (NOT EXISTS (SELECT 1 FROM sys.views WHERE name = 'data_VVV'))
BEGIN
    EXECUTE('CREATE VIEW data_VVVV as SELECT 1 as t');
END;

GO

ALTER VIEW data_VVVV AS 
    SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A ;

The first checks for the existence of the view (there are other ways to do this). If it doesn't exist, then create it with something simple and dumb. If it does, then just move on to the alter view statement.

When to use MongoDB or other document oriented database systems?

I've seen at lot of companies are using MongoDB for realtime analytics from application logs. Its schema-freeness really fits for application logs, where record schema tends to change time-to-time. Also, its Capped Collection feature is useful because it automatically purges old data to keep the data fit into the memory.

That is one area I really think MongoDB fits for, but MySQL/PostgreSQL is more recommended in general. There're a lot of documentations and developer resources on the web, as well as their functionality and robustness.

Hibernate Annotations - Which is better, field or property access?

I think annotating the property is better because updating fields directly breaks encapsulation, even when your ORM does it.

Here's a great example of where it will burn you: you probably want your annotations for hibernate validator & persistence in the same place (either fields or properties). If you want to test your hibernate validator powered validations which are annotated on a field, you can't use a mock of your entity to isolate your unit test to just the validator. Ouch.

How do you test your Request.QueryString[] variables?

Use int.TryParse instead to get rid of the try-catch block:

if (!int.TryParse(Request.QueryString["id"], out id))
{
  // error case
}

Multiple scenarios @RequestMapping produces JSON/XML together with Accept or ResponseEntity

I've preferred using the params filter for parameter-centric content-type.. I believe that should work in conjunction with the produces attribute.

@GetMapping(value="/person/{id}/", 
            params="format=json",
            produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Person> getPerson(@PathVariable Integer id){
    Person person = personMapRepository.findPerson(id);
    return ResponseEntity.ok(person);
} 
@GetMapping(value="/person/{id}/", 
            params="format=xml",
            produces=MediaType.APPLICATION_XML_VALUE)
public ResponseEntity<Person> getPersonXML(@PathVariable Integer id){
    return GetPerson(id); // delegate
}

How to get the last five characters of a string using Substring() in C#?

One way is to use the Length property of the string as part of the input to Substring:

string sub = input.Substring(input.Length - 5); // Retrieves the last 5 characters of input

HTML to PDF with Node.js

For those who don't want to install PhantomJS along with an instance of Chrome/Firefox on their server - or because the PhantomJS project is currently suspended, here's an alternative.

You can externalize the conversions to APIs to do the job. Many exists and varies but what you'll get is a reliable service with up-to-date features (I'm thinking CSS3, Web fonts, SVG, Canvas compatible).

For instance, with PDFShift (disclaimer, I'm the founder), you can do this simply by using the request package:

const request = require('request')
request.post(
    'https://api.pdfshift.io/v2/convert/',
    {
        'auth': {'user': 'your_api_key'},
        'json': {'source': 'https://www.google.com'},
        'encoding': null
    },
    (error, response, body) => {
        if (response === undefined) {
            return reject({'message': 'Invalid response from the server.', 'code': 0, 'response': response})
        }
        if (response.statusCode == 200) {
            // Do what you want with `body`, that contains the binary PDF
            // Like returning it to the client - or saving it as a file locally or on AWS S3
            return True
        }

        // Handle any errors that might have occured
    }
);

Reverse / invert a dictionary mapping

def invertDictionary(d):
    myDict = {}
  for i in d:
     value = d.get(i)
     myDict.setdefault(value,[]).append(i)   
 return myDict
 print invertDictionary({'a':1, 'b':2, 'c':3 , 'd' : 1})

This will provide output as : {1: ['a', 'd'], 2: ['b'], 3: ['c']}

How to make a copy of a file in android?

Why split the <script> tag when writing it with document.write()?

The </script> inside the Javascript string litteral is interpreted by the HTML parser as a closing tag, causing unexpected behaviour (see example on JSFiddle).

To avoid this, you can place your javascript between comments (this style of coding was common practice, back when Javascript was poorly supported among browsers). This would work (see example in JSFiddle):

<script type="text/javascript">
    <!--
    if (jQuery === undefined) {
        document.write('<script type="text/javascript" src="http://z-ecx.images-amazon.com/images/G/01/javascripts/lib/jquery/jquery-1.2.6.pack._V265113567_.js"></script>');
    }
    // -->
</script>

...but to be honest, using document.write is not something I would consider best practice. Why not manipulating the DOM directly?

<script type="text/javascript">
    <!--
    if (jQuery === undefined) {
        var script = document.createElement('script');
        script.setAttribute('type', 'text/javascript');
        script.setAttribute('src', 'http://z-ecx.images-amazon.com/images/G/01/javascripts/lib/jquery/jquery-1.2.6.pack._V265113567_.js');
        document.body.appendChild(script);
    }
    // -->
</script>

Joining 2 SQL SELECT result sets into one

Use a FULL OUTER JOIN:

select 
   a.col_a,
   a.col_b,
   b.col_c
from
   (select col_a,col_bfrom tab1) a
join 
   (select col_a,col_cfrom tab2) b 
on a.col_a= b.col_a

How to see if a directory exists or not in Perl?

Use -d (full list of file tests)

if (-d "cgi-bin") {
    # directory called cgi-bin exists
}
elsif (-e "cgi-bin") {
    # cgi-bin exists but is not a directory
}
else {
    # nothing called cgi-bin exists
}

As a note, -e doesn't distinguish between files and directories. To check if something exists and is a plain file, use -f.

How to stop event propagation with inline onclick attribute?

Keep in mind that window.event is not supported in FireFox, and therefore it must be something along the lines of:

e.cancelBubble = true

Or, you can use the W3C standard for FireFox:

e.stopPropagation();

If you want to get fancy, you can do this:

function myEventHandler(e)
{
    if (!e)
      e = window.event;

    //IE9 & Other Browsers
    if (e.stopPropagation) {
      e.stopPropagation();
    }
    //IE8 and Lower
    else {
      e.cancelBubble = true;
    }
}

Matplotlib scatter plot with different text at each data point

I'm not aware of any plotting method which takes arrays or lists but you could use annotate() while iterating over the values in n.

y = [2.56422, 3.77284, 3.52623, 3.51468, 3.02199]
z = [0.15, 0.3, 0.45, 0.6, 0.75]
n = [58, 651, 393, 203, 123]

fig, ax = plt.subplots()
ax.scatter(z, y)

for i, txt in enumerate(n):
    ax.annotate(txt, (z[i], y[i]))

There are a lot of formatting options for annotate(), see the matplotlib website:

enter image description here

The breakpoint will not currently be hit. No symbols have been loaded for this document in a Silverlight application

I had this very issue when at a client where - for each application solution - they copied most shared assemblies to a "References" folder, then added them to the solution both as "Solution items" and as a "Project" within the solution.

Not sure yet why, but some of them were debuggable, some not, even though in the References settings for the assemblies the correct full paths were specified.

This unpredictable behaviour alomst drove me mad :)

I solved this by removing all the assemblies from the "References" folder for which there were projects with source code, and keeping very good track of version information for shared assemblies.

"405 method not allowed" in IIS7.5 for "PUT" method

I had this problem with WebDAV when hosting a MVC4 WebApi Project. I got around it by adding this line to the web.config:

<handlers>
  <remove name="WebDAV" />
  <add name="WebDAV" path="*" verb="*" modules="WebDAVModule"
      resourceType="Unspecified" requireAccess="None" />
</handlers>

As explained here: http://evolutionarydeveloper.blogspot.co.uk/2012/07/method-not-allowed-405-on-iis7-website.html

SimpleDateFormat and locale based format string

This will display the date according to user's current locale:

To return date and time:

import java.text.DateFormat;    
import java.util.Date;

Date date = new Date();
DateFormat df = DateFormat.getDateTimeInstance();
String myDate = df.format(date);

Dec 31, 1969 7:00:02 PM

To return date only, use:

DateFormat.getDateInstance()

Dec 31, 1969

How to extract this specific substring in SQL Server?

An alternative to the answer provided by @Marc

SELECT SUBSTRING(LEFT(YOUR_FIELD, CHARINDEX('[', YOUR_FIELD) - 1), CHARINDEX(';', YOUR_FIELD) + 1, 100)
FROM YOUR_TABLE
WHERE CHARINDEX('[', YOUR_FIELD) > 0 AND
    CHARINDEX(';', YOUR_FIELD) > 0;

This makes sure the delimiters exist, and solves an issue with the currently accepted answer where doing the LEFT last is working with the position of the last delimiter in the original string, rather than the revised substring.

Apache is "Unable to initialize module" because of module's and PHP's API don't match after changing the PHP configuration

This problem has just happened to me and has been solved simply by increasing memory_limit from 32 M to 64 M You can adjust the value on the file where php.ini exists

locate php.ini then choose the right file and search for memory_limit and after modifying it you must reboot the apache /etc/init.d/httpd restart

All the best.

What are abstract classes and abstract methods?

An abstract method is a method signature declaration with no body. For instance:

public abstract class Shape {
    . . .

    public abstract double getArea();
    public abstract double getPerimeter();
}

The methods getArea() and getPerimeter() are abstract. Because the Shape class has an abstract method, it must be declared abstract as well. A class may also be declared abstract without any abstract methods. When a class is abstract, an instance of it cannot be created; one can only create instances of (concrete) subclasses. A concrete class is a class that is not declared abstract (and therefore has no abstract methods and implements all inherited abstract methods). For instance:

public class Circle extends Shape {
    public double radius;
    . . .

    public double getArea() {
        return Math.PI * radius * radius;
    }

    public double getPerimeter() {
        return 2.0 * Math.PI * radius;
    }
}

There are many reasons to do this. One would be to write a method that would be the same for all shapes but that depends on shape-specific behavior that is unknown at the Shape level. For instance, one could write the method:

public abstract class Shape {
    . . .

    public void printArea(PrintStream out) {
        out.println("The area is " + getArea());
    }
}

Admittedly, this is a contrived example, but it shows the basic idea: define concrete behavior in terms of unspecified behavior.

Another reason for having an abstract class is so you can partially implement an interface. All methods declared in an interface are inherited as abstract methods by any class that implements the interface. Sometimes you want to provide a partial implementation of an interface in a class and leave the details to subclasses; the partial implementation must be declared abstract.

How to set aliases in the Git Bash for Windows?

To Add a Temporary Alias:

Goto Terminal (I'm using git bash for windows).
Type $ alias gpuom='git push origin master'
To See a List of All the aliases type $ alias hit Enter.

To Add a Permanent Alias:

Goto Terminal (I'm using git bash for windows).
Type $ vim ~/.bashrc and hit Enter (I'm guessing you are familiar with vim).

Add your new aliases (For reference look at the snippet below).

#My custom aliases  
alias gpuom='git push origin master' 
alias gplom='git pull origin master'

Save and Exit (Press Esc then type :wq).
To See a List of All the aliases type $ alias hit Enter.

wampserver doesn't go green - stays orange

Make a Ctrl+Alt+Suppr in order to see if no other Apache version is ever runing on your computer. It was the case for me, I just stop them and the light pass green!

Cheers!

Why should we NOT use sys.setdefaultencoding("utf-8") in a py script?

The first danger lies in reload(sys).

When you reload a module, you actually get two copies of the module in your runtime. The old module is a Python object like everything else, and stays alive as long as there are references to it. So, half of the objects will be pointing to the old module, and half to the new one. When you make some change, you will never see it coming when some random object doesn't see the change:
```
(This is IPython shell)

In [1]: import sys

In [2]: sys.stdout
Out[2]: <colorama.ansitowin32.StreamWrapper at 0x3a2aac8>

In [3]: reload(sys)
<module 'sys' (built-in)>

In [4]: sys.stdout
Out[4]: <open file '<stdout>', mode 'w' at 0x00000000022E20C0>

In [11]: import IPython.terminal

In [14]: IPython.terminal.interactiveshell.sys.stdout
Out[14]: <colorama.ansitowin32.StreamWrapper at 0x3a9aac8>
```
Now, sys.setdefaultencoding() proper

All that it affects is implicit conversion str<->unicode. Now, utf-8 is the sanest encoding on the planet (backward-compatible with ASCII and all), the conversion now "just works", what could possibly go wrong?

Well, anything. And that is the danger.
- There may be some code that relies on the UnicodeError being thrown for non-ASCII input, or does the transcoding with an error handler, which now produces an unexpected result. And since all code is tested with the default setting, you're strictly on "unsupported" territory here, and no-one gives you guarantees about how their code will behave.
- The transcoding may produce unexpected or unusable results if not everything on the system uses UTF-8 because Python 2 actually has multiple independent "default string encodings". (Remember, a program must work for the customer, on the customer's equipment.)
  - Again, the worst thing is you will never know that because the conversion is implicit -- you don't really know when and where it happens. (Python Zen, koan 2 ahoy!) You will never know why (and if) your code works on one system and breaks on another. (Or better yet, works in IDE and breaks in console.)

How to read a file into a variable in shell?

You can access 1 line at a time by for loop

#!/bin/bash -eu

#This script prints contents of /etc/passwd line by line

FILENAME='/etc/passwd'
I=0
for LN in $(cat $FILENAME)
do
    echo "Line number $((I++)) -->  $LN"
done

Copy the entire content to File (say line.sh ) ; Execute

chmod +x line.sh
./line.sh

Insert some string into given string at given index in Python

line='Name Age Group Class Profession'
arr = line.split()
for i in range(3):
    arr.insert(2, arr[2])
print(' '.join(arr))

How to export data with Oracle SQL Developer?

If, at some point, you only need to export a single result set, just right click "on the data" (any column of any row) there you will find an export option. The wizard exports the complete result set regardless of what you selected

How to read input with multiple lines in Java

The problem you're having running from the command line is that you don't put ".class" after your class file.

java Practice 10 12

should work - as long as you're somewhere java can find the .class file.

Classpath issues are a whole 'nother story. If java still complains that it can't find your class, go to the same directory as your .class file (and it doesn't appear you're using packages...) and try -

java -cp . Practice 10 12

MySQL Error 1215: Cannot add foreign key constraint

Another reason: if you use ON DELETE SET NULL all columns that are used in the foreign key must allow null values. Someone else found this out in this question.

From my understanding it wouldn't be a problem regarding data integrity, but it seems that MySQL just doesn't support this feature (in 5.7).

Converting dictionary to JSON

json.dumps() converts a dictionary to str object, not a json(dict) object! So you have to load your str into a dict to use it by using json.loads() method

See json.dumps() as a save method and json.loads() as a retrieve method.

This is the code sample which might help you understand it more:

import json

r = {'is_claimed': 'True', 'rating': 3.5}
r = json.dumps(r)
loaded_r = json.loads(r)
loaded_r['rating'] #Output 3.5
type(r) #Output str
type(loaded_r) #Output dict

MacOSX homebrew mysql root password

Running these lines in the terminal did the trick for me and several others who had the same problem. These instructions are listed in the terminal after brew installs mysql sucessfully.

mkdir -p ~/Library/LaunchAgents

cp /usr/local/Cellar/mysql/5.5.25a/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/

launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

/usr/local/Cellar/mysql/5.5.25a/bin/mysqladmin -u root password 'YOURPASSWORD'

where YOURPASSWORD is the password for root.

How to determine whether a Pandas Column contains a particular value

Or use Series.tolist or Series.any:

>>> s = pd.Series(list('abc'))
>>> s
0    a
1    b
2    c
dtype: object
>>> 'a' in s.tolist()
True
>>> (s=='a').any()
True

Series.tolist makes a list about of a Series, and the other one i am just getting a boolean Series from a regular Series, then checking if there are any Trues in the boolean Series.

jQuery: how to change title of document during .ready()?

This works fine in all browser...

$(document).attr("title", "New Title");

Works in IE too

Reading data from a website using C#

Regarding the suggestion So I would suggest that you use WebClient and investigate the causes of the 30 second delay.

From the answers for the question System.Net.WebClient unreasonably slow

Try setting Proxy = null;

WebClient wc = new WebClient(); wc.Proxy = null;

Credit to Alex Burtsev

Push eclipse project to GitHub with EGit

The key lies in when you create the project in eclipse.

First step, you create the Java project in eclipse. Right click on the project and choose Team > Share>Git.

In the Configure Git Repository dialog, ensure that you select the option to create the Repository in the parent folder of the project.. enter image description here Then you can push to github.

N.B: Eclipse will give you a warning about putting git repositories in your workspace. So when you create your project, set your project directory outside the default workspace.

Multiple variables in a 'with' statement?

From Python 3.10 there is a new feature of Parenthesized context managers, which permits syntax such as:

with (
    A() as a,
    B() as b
):
    do_something(a, b)

Display array values in PHP

Other option:

$lijst=array(6,4,7,2,1,8,9,5,0,3);
for($i=0;$i<10;$i++){
echo $lijst[$i];
echo "<br>";
}

How to list all databases in the mongo shell?

From the command line issue

mongo --quiet --eval  "printjson(db.adminCommand('listDatabases'))"

which gives output

{
    "databases" : [
        {
            "name" : "admin",
            "sizeOnDisk" : 978944,
            "empty" : false
        },
        {
            "name" : "local",
            "sizeOnDisk" : 77824,
            "empty" : false
        },
        {
            "name" : "meteor",
            "sizeOnDisk" : 778240,
            "empty" : false
        }
    ],
    "totalSize" : 1835008,
    "ok" : 1
}

Programs & Examples On #Flvplayback

Play infinitely looping video on-load in HTML5

ssh : Permission denied (publickey,gssapi-with-mic)

How can I add C++11 support to Code::Blocks compiler?

How to convert a String to long in javascript?

Achieving white opacity effect in html/css

How do I configure Maven for offline development?

"No Content-Security-Policy meta tag found." error in my phonegap application

PHP - Get key name of array value

What is sharding and why is it important?

How to get the previous page URL using JavaScript?

Suppress warning messages using mysql from within Terminal, but password written in bash script

How to fix '.' is not an internal or external command error

how to check for datatype in node js- specifically for integer

SQL Query - how do filter by null or not null

Case insensitive access for generic dictionary

Proper way to make HTML nested list?

Format price in the current locale and currency

Why do we use $rootScope.$broadcast in AngularJS?

How to get Selected Text from select2 when using <input>

IOS - How to segue programmatically using swift

Android Studio rendering problems

Type.GetType("namespace.a.b.ClassName") returns null

RegEx: Grabbing values between quotation marks

SELECT COUNT in LINQ to SQL C#

Convert an integer to a float number

Python script to copy text to clipboard

Does Java read integers in little endian or big endian?

How can I declare and use Boolean variables in a shell script?

Evaluate list.contains string in JSTL

Can I delete a git commit but keep the changes?

comparing 2 strings alphabetically for sorting purposes

How set maximum date in datepicker dialog in android?

SQLite add Primary Key

C compiling - "undefined reference to"?

Get the last non-empty cell in a column in Google Sheets

for a row:

for a column:

Where does MAMP keep its php.ini?

How to set default value for column of new created table from select statement in 11g

How to show the "Are you sure you want to navigate away from this page?" when changes committed?

What's the u prefix in a Python string?

List of foreign keys and the tables they reference in Oracle DB

Testing web application on Mac/Safari when I don't own a Mac

heroku - how to see all the logs

Using SVG as background image

How to create temp table using Create statement in SQL Server?

Iterating through all nodes in XML file

Git pull a certain branch from GitHub

How can I regenerate ios folder in React Native project?

How do I retrieve an HTML element's actual width and height?

Create a button programmatically and set a background image

"Cloning" row or column vectors

How to transform numpy.matrix or array to scipy sparse matrix

Exception of type 'System.OutOfMemoryException' was thrown. Why?

Parsing JSON object in PHP using json_decode

Why call git branch --unset-upstream to fixup?

Warning: X may be used uninitialized in this function

How to open some ports on Ubuntu?

How do you hide the Address bar in Google Chrome for Chrome Apps?

Replace multiple characters in a C# string

IIS - 401.3 - Unauthorized

How to assign a value to a TensorFlow variable?

Timing Delays in VBA

How do you create a UIImage View Programmatically - Swift

use video as background for div

Pure CSS method

2021 answer: object-fit

Previous answer: CSS Transform

How to access custom attributes from event object in React?

How to add fixed button to the bottom right of page

Specify sudo password for Ansible

How to split a string in Java

Is Visual Studio Community a 30 day trial?

How to force JS to do math instead of putting two strings together

How to validate date with format "mm/dd/yyyy" in JavaScript?

Calling stored procedure from another stored procedure SQL Server

Get Public URL for File - Google Cloud Storage - App Engine (Python)

Specifying trust store information in spring boot application.properties

Find multiple files and rename them in Linux