Programs & Examples On #Jcombobox

A JComboBox is a Java GUI object. It is a combination of a drop-down list and a single-line JTextField, allowing the user to either type a value directly into the control or choose from the list of existing options.

JComboBox Selection Change Listener?

You may try these

 int selectedIndex = myComboBox.getSelectedIndex();

-or-

Object selectedObject = myComboBox.getSelectedItem();

-or-

String selectedValue = myComboBox.getSelectedValue().toString();

Adding items to a JComboBox

create a new class called ComboKeyValue.java

    public class ComboKeyValue {
        private String key;
        private String value;
    
        public ComboKeyValue(String key, String value) {
            this.key = key;
            this.value = value;
        }
        
        @Override
        public String toString(){
            return key;
        }
    
        public String getKey() {
            return key;
        }
    
        public String getValue() {
            return value;
        }
}

when you want to add a new item, just write the code as below

 DefaultComboBoxModel model = new DefaultComboBoxModel();
    model.addElement(new ComboKeyValue("key", "value"));
    properties.setModel(model);

How do I populate a JComboBox with an ArrayList?

i think that is the solution

ArrayList<table> libel = new ArrayList<table>();
try {
SessionFactory sf = new Configuration().configure().buildSessionFactory();
Session s = sf.openSession();
s.beginTransaction();

String hql = "FROM table ";

org.hibernate.Query query = s.createQuery(hql);
libel= (ArrayList<table>) query.list();
Iterator it = libel.iterator();
while(it.hasNext()) {
table cat = (table) it.next();

cat.getLibCat();//table colonm getter


combobox.addItem(cat.getLibCat());
}
s.getTransaction().commit();
s.close();
sf.close();
} catch (Exception e) {
System.out.println("Exception in getSelectedData::"+e.getMessage());

How to set selected index JComboBox by value

for example

enter image description here

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

public class ComboboxExample {

    private JFrame frame = new JFrame("Test");
    private JComboBox comboBox = new JComboBox();

    public ComboboxExample() {
        createGui();
    }

    private void createGui() {
        comboBox.addItem("One");
        comboBox.addItem("Two");
        comboBox.addItem("Three");
        JButton button = new JButton("Show Selected");
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(frame, "Selected item: " + comboBox.getSelectedItem());
                javax.swing.SwingUtilities.invokeLater(new Runnable() {

                    @Override
                    public void run() {
                        comboBox.requestFocus();
                        comboBox.requestFocusInWindow();
                    }
                });
            }
        });
        JButton button1 = new JButton("Append Items");
        button1.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                appendCbItem();
            }
        });
        JButton button2 = new JButton("Reduce Items");
        button2.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                reduceCbItem();
            }
        });
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new GridLayout(4, 1));
        frame.add(comboBox);
        frame.add(button);
        frame.add(button1);
        frame.add(button2);
        frame.setLocation(200, 200);
        frame.pack();
        frame.setVisible(true);
        selectFirstItem();
    }

    public void appendCbItem() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                comboBox.addItem("Four");
                comboBox.addItem("Five");
                comboBox.addItem("Six");
                comboBox.setSelectedItem("Six");
                requestCbFocus();
            }
        });
    }

    public void reduceCbItem() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                comboBox.removeItem("Four");
                comboBox.removeItem("Five");
                comboBox.removeItem("Six");
                selectFirstItem();
            }
        });
    }

    public void selectFirstItem() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                comboBox.setSelectedIndex(0);
                requestCbFocus();
            }
        });
    }

    public void requestCbFocus() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                comboBox.requestFocus();
                comboBox.requestFocusInWindow();
            }
        });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                ComboboxExample comboboxExample = new ComboboxExample();
            }
        });
    }
}

Execute an action when an item on the combobox is selected

this is how you do it with ActionLIstener

import java.awt.FlowLayout;
import java.awt.event.*;

import javax.swing.*;

public class MyWind extends JFrame{

    public MyWind() {
        initialize();
    }

    private void initialize() {
        setSize(300, 300);
        setLayout(new FlowLayout(FlowLayout.LEFT));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JTextField field = new JTextField();
        field.setSize(200, 50);
        field.setText("              ");

        JComboBox comboBox = new JComboBox();
        comboBox.setEditable(true);
        comboBox.addItem("item1");
        comboBox.addItem("item2");

        //
        // Create an ActionListener for the JComboBox component.
        //
        comboBox.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                //
                // Get the source of the component, which is our combo
                // box.
                //
                JComboBox comboBox = (JComboBox) event.getSource();

                Object selected = comboBox.getSelectedItem();
                if(selected.toString().equals("item1"))
                field.setText("30");
                else if(selected.toString().equals("item2"))
                    field.setText("40");

            }
        });
        getContentPane().add(comboBox);
        getContentPane().add(field);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new MyWind().setVisible(true);
            }
        });
    }
}

numpy division with RuntimeWarning: invalid value encountered in double_scalars

You can use np.logaddexp (which implements the idea in @gg349's answer):

In [33]: d = np.array([[1089, 1093]])

In [34]: e = np.array([[1000, 4443]])

In [35]: log_res = np.logaddexp(-3*d[0,0], -3*d[0,1]) - np.logaddexp(-3*e[0,0], -3*e[0,1])

In [36]: log_res
Out[36]: -266.99999385580668

In [37]: res = exp(log_res)

In [38]: res
Out[38]: 1.1050349147204485e-116

Or you can use scipy.special.logsumexp:

In [52]: from scipy.special import logsumexp

In [53]: res = np.exp(logsumexp(-3*d) - logsumexp(-3*e))

In [54]: res
Out[54]: 1.1050349147204485e-116

Regex to match words of a certain length

I think you want \b\w{1,10}\b. The \b matches a word boundary.

Of course, you could also replace the \b and do ^\w{1,10}$. This will match a word of at most 10 characters as long as its the only contents of the string. I think this is what you were doing before.

Since it's Java, you'll actually have to escape the backslashes: "\\b\\w{1,10}\\b". You probably knew this already, but it's gotten me before.

Using underscores in Java variables and method names

it's just your own style,nothing a bad style code,and nothing a good style code,just difference our code with the others.

Opening a .ipynb.txt File

Below is the easiest way in case if Anaconda is already installed.

1) Under "Files", there is an option called,"Upload".

2) Click on "Upload" button and it asks for the path of the file and select the file and click on upload button present beside the file.

printf format specifiers for uint32_t and size_t

Try

#include <inttypes.h>
...

printf("i [ %zu ] k [ %"PRIu32" ]\n", i, k);

The z represents an integer of length same as size_t, and the PRIu32 macro, defined in the C99 header inttypes.h, represents an unsigned 32-bit integer.

How to close a Tkinter window by pressing a Button?

With minimal editing to your code (Not sure if they've taught classes or not in your course), change:

def close_window(root): 
    root.destroy()

to

def close_window(): 
    window.destroy()

and it should work.


Explanation:

Your version of close_window is defined to expect a single argument, namely root. Subsequently, any calls to your version of close_window need to have that argument, or Python will give you a run-time error.

When you created a Button, you told the button to run close_window when it is clicked. However, the source code for Button widget is something like:

# class constructor
def __init__(self, some_args, command, more_args):
    #...
    self.command = command
    #...

# this method is called when the user clicks the button
def clicked(self):
    #...
    self.command() # Button calls your function with no arguments.
    #...

As my code states, the Button class will call your function with no arguments. However your function is expecting an argument. Thus you had an error. So, if we take out that argument, so that the function call will execute inside the Button class, we're left with:

def close_window(): 
    root.destroy()

That's not right, though, either, because root is never assigned a value. It would be like typing in print(x) when you haven't defined x, yet.

Looking at your code, I figured you wanted to call destroy on window, so I changed root to window.

How to set menu to Toolbar in Android

Don't use setSupportActionBar(toolbar)

I don't know why but this works for me.

toolbar = (Toolbar) findViewById(R.id.main_toolbar);
toolbar.setSubtitle("Test Subtitle");
toolbar.inflateMenu(R.menu.main_manu);

For menu item click do this

toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {

        @Override
        public boolean onMenuItemClick(MenuItem item) {

            if(item.getItemId()==R.id.item1)
            {
                // do something
            }
            else if(item.getItemId()== R.id.filter)
            {
               // do something
            }
            else{
               // do something
            }

            return false;
        }
    });

Will update the 'why' part of this answer when I find a proper explanation.
Happy to help anyway :) Peace.

Parsing JSON string in Java

Looks like for both of your objects (inside the array), you have an extra closing brace after "Longitude".

How do I count cells that are between two numbers in Excel?

=COUNTIFS(H5:H21000,">=100", H5:H21000,"<999")

Active Menu Highlight CSS

Add a class to the body of each page:

<body class="home">

Or if you're on the contact page:

<body class="contact">

Then take this into consideration when you're creating your styles:

#sub-header ul li:hover,
body.home li.home,
body.contact li.contact { background-color: #000;}

#sub-header ul li:hover a,
body.home li.home a,
body.contact li.contact a { color: #fff; }

Lastly, apply class names to your list items:

<ul>
  <li class="home"><a href="index.php">Home</a></li>
  <li class="contact"><a href="contact.php">Contact Us</a></li>
  <li class="about"><a href="about.php">About Us</a></li>
</ul>

This point, whenever you're on the body.home page, your li.home a link will have default styling indicating it is the current page.

bodyParser is deprecated express 4

If you're using express > 4.16, you can use express.json() and express.urlencoded()

The express.json() and express.urlencoded() middleware have been added to provide request body parsing support out-of-the-box. This uses the expressjs/body-parser module module underneath, so apps that are currently requiring the module separately can switch to the built-in parsers.

Source Express 4.16.0 - Release date: 2017-09-28

With this,

const bodyParser  = require('body-parser');

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

becomes,

const express = require('express');

app.use(express.urlencoded({ extended: true }));
app.use(express.json());

Loop through properties in JavaScript object with Lodash

It would be helpful to understand why you need to do this with lodash. If you just want to check if a key exists in an object, you don't need lodash.

myObject.options.hasOwnProperty('property');

If your looking to see if a value exists, you can use _.invert

_.invert(myObject.options)[value]

How to add items to a spinner in Android?

<string-array name="array_name">
<item>Array Item One</item>
<item>Array Item Two</item>
<item>Array Item Three</item>
</string-array>

In your layout:

<Spinner 
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="true"
        android:entries="@array/array_name"
    />

How to programmatically move, copy and delete files and directories on SD?

Delete

public static void deleteRecursive(File fileOrDirectory) {

 if (fileOrDirectory.isDirectory())
    for (File child : fileOrDirectory.listFiles())
        deleteRecursive(child);

    fileOrDirectory.delete();

    }

check this link for above function.

Copy

public static void copyDirectoryOneLocationToAnotherLocation(File sourceLocation, File targetLocation)
    throws IOException {

if (sourceLocation.isDirectory()) {
    if (!targetLocation.exists()) {
        targetLocation.mkdir();
    }

    String[] children = sourceLocation.list();
    for (int i = 0; i < sourceLocation.listFiles().length; i++) {

        copyDirectoryOneLocationToAnotherLocation(new File(sourceLocation, children[i]),
                new File(targetLocation, children[i]));
    }
} else {

    InputStream in = new FileInputStream(sourceLocation);

    OutputStream out = new FileOutputStream(targetLocation);

    // Copy the bits from instream to outstream
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    in.close();
    out.close();
}

}

Move

move is nothing just copy the folder one location to another then delete the folder thats it

manifest

     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

JList add/remove Item

The best and easiest way to clear a JLIST is:

myJlist.setListData(new String[0]);

Sorting a Python list by two fields

like this:

import operator
list1 = sorted(csv1, key=operator.itemgetter(1, 2))

Converting BigDecimal to Integer

Well, you could call BigDecimal.intValue():

Converts this BigDecimal to an int. This conversion is analogous to a narrowing primitive conversion from double to short as defined in the Java Language Specification: any fractional part of this BigDecimal will be discarded, and if the resulting "BigInteger" is too big to fit in an int, only the low-order 32 bits are returned. Note that this conversion can lose information about the overall magnitude and precision of this BigDecimal value as well as return a result with the opposite sign.

You can then either explicitly call Integer.valueOf(int) or let auto-boxing do it for you if you're using a sufficiently recent version of Java.

Detect page change on DataTable

If you handle the draw.dt event after page.dt, you can detect exactly after moving the page. After work, draw.dt must be unbind

    $(document).on("page.dt", () => {
        $(document).on("draw.dt", changePage);
    });

    const changePage = () => {
        // TODO
        $(document).unbind("draw.dt", changePage);
    } 

Logical operators ("and", "or") in DOS batch

You can do and with nested conditions:

if %age% geq 2 (
    if %age% leq 12 (
        set class=child
    )
)

or:

if %age% geq 2 if %age% leq 12 set class=child

You can do or with a separate variable:

set res=F
if %hour% leq 6 set res=T
if %hour% geq 22 set res=T
if "%res%"=="T" (
    set state=asleep
)

Reading local text file into a JavaScript array

Using Node.js

sync mode:

var fs = require("fs");
var text = fs.readFileSync("./mytext.txt");
var textByLine = text.split("\n")

async mode:

var fs = require("fs");
fs.readFile("./mytext.txt", function(text){
    var textByLine = text.split("\n")
});

UPDATE

As of at least Node 6, readFileSync returns a Buffer, so it must first be converted to a string in order for split to work:

var text = fs.readFileSync("./mytext.txt").toString('utf-8');

Or

var text = fs.readFileSync("./mytext.txt", "utf-8");

compare differences between two tables in mysql

I found another solution in this link

SELECT MIN (tbl_name) AS tbl_name, PK, column_list
FROM
 (
  SELECT ' source_table ' as tbl_name, S.PK, S.column_list
  FROM source_table AS S
  UNION ALL
  SELECT 'destination_table' as tbl_name, D.PK, D.column_list
  FROM destination_table AS D 
)  AS alias_table
GROUP BY PK, column_list
HAVING COUNT(*) = 1
ORDER BY PK

How can I read a text file from the SD card in Android?

You should have READ_EXTERNAL_STORAGE permission for reading sdcard. Add permission in manifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

From android 6.0 or higher, your app must ask user to grant the dangerous permissions at runtime. Please refer this link Permissions overview

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 0);
    }
}

Using Python's os.path, how do I go up one directory?

from os.path import dirname, realpath, join
join(dirname(realpath(dirname(__file__))), 'templates')

Update:

If you happen to "copy" settings.py through symlinking, @forivall's answer is better:

~user/
    project1/  
        mysite/
            settings.py
        templates/
            wrong.html

    project2/
        mysite/
            settings.py -> ~user/project1/settings.py
        templates/
            right.html

The method above will 'see' wrong.html while @forivall's method will see right.html

In the absense of symlinks the two answers are identical.

What is (functional) reactive programming?

It is about mathematical data transformations over time (or ignoring time).

In code this means functional purity and declarative programming.

State bugs are a huge problem in the standard imperative paradigm. Various bits of code may change some shared state at different "times" in the programs execution. This is hard to deal with.

In FRP you describe (like in declarative programming) how data transforms from one state to another and what triggers it. This allows you to ignore time because your function is simply reacting to its inputs and using their current values to create a new one. This means that the state is contained in the graph (or tree) of transformation nodes and is functionally pure.

This massively reduces complexity and debugging time.

Think of the difference between A=B+C in math and A=B+C in a program. In math you are describing a relationship that will never change. In a program, its says that "Right now" A is B+C. But the next command might be B++ in which case A is not equal to B+C. In math or declarative programming A will always be equal to B+C no matter what point in time you ask.

So by removing the complexities of shared state and changing values over time. You program is much easier to reason about.

An EventStream is an EventStream + some transformation function.

A Behaviour is an EventStream + Some value in memory.

When the event fires the value is updated by running the transformation function. The value that this produces is stored in the behaviours memory.

Behaviours can be composed to produce new behaviours that are a transformation on N other behaviours. This composed value will recalculate as the input events (behaviours) fire.

"Since observers are stateless, we often need several of them to simulate a state machine as in the drag example. We have to save the state where it is accessible to all involved observers such as in the variable path above."

Quote from - Deprecating The Observer Pattern http://infoscience.epfl.ch/record/148043/files/DeprecatingObserversTR2010.pdf

How to submit form on change of dropdown list?

To those in the answer above. It's definitely JavaScript. It's just inline.

BTW the jQuery equivalent if you want to apply to all selects:

$('form select').on('change', function(){
    $(this).closest('form').submit();
});

Regex Last occurrence?

I used below regex to get that result also when its finished by a \

(\\[^\\]+)\\?$

[Regex Demo]

How to find out if you're using HTTPS without $_SERVER['HTTPS']

The only reliable method is the one described by Igor M.

$pv_URIprotocol = isset($_SERVER["HTTPS"]) ? (($_SERVER["HTTPS"]==="on" || $_SERVER["HTTPS"]===1 || $_SERVER["SERVER_PORT"]===$pv_sslport) ? "https://" : "http://") :  (($_SERVER["SERVER_PORT"]===$pv_sslport) ? "https://" : "http://");

Consider following: You are using nginx with fastcgi, by default(debian, ubuntu) fastgi_params contain directive:

fastcgi_param HTTPS $https;

if you are NOT using SSL, it gets translated as empty value, not 'off', not 0 and you are doomed.

http://unpec.blogspot.cz/2013/01/nette-nginx-php-fpm-redirect.html

Eclipse: stop code from running (java)

For Eclipse: menu bar-> window -> show view then find "debug" option if not in list then select other ...

new window will open and then search using keyword "debug" -> select debug from list

it will added near console tab. use debug tab to terminate and remove previous executions. ( right clicking on executing process will show you many option including terminate)

C++ Get name of type in template

This trick was mentioned under a few other questions, but not here yet.

All major compilers support __PRETTY_FUNC__ (GCC & Clang) /__FUNCSIG__ (MSVC) as an extension.

When used in a template like this:

template <typename T> const char *foo()
{
    #ifdef _MSC_VER
    return __FUNCSIG__;
    #else
    return __PRETTY_FUNCTION__;
    #endif
}

It produces strings in a compiler-dependent format, that contain, among other things, the name of T.

E.g. foo<float>() returns:

  • "const char* foo() [with T = float]" on GCC
  • "const char *foo() [T = float]" on Clang
  • "const char *__cdecl foo<float>(void)" on MSVC

You can easily parse the type names out of those strings. You just need to figure out how many 'junk' characters your compiler inserts before and after the type.

You can even do that completely at compile-time.


The resulting names can slightly vary between different compilers. E.g. GCC omits default template arguments, and MSVC prefixes classes with the word class.


Here's an implementation that I've been using. Everything is done at compile-time.

Example usage:

std::cout << TypeName<float>() << '\n';
std::cout << TypeName(1.2f); << '\n';

Implementation:

#include <array>
#include <cstddef>

namespace impl
{
    template <typename T>
    constexpr const auto &RawTypeName()
    {
        #ifdef _MSC_VER
        return __FUNCSIG__;
        #else
        return __PRETTY_FUNCTION__;
        #endif
    }

    struct RawTypeNameFormat
    {
        std::size_t leading_junk = 0, trailing_junk = 0;
    };

    // Returns `false` on failure.
    inline constexpr bool GetRawTypeNameFormat(RawTypeNameFormat *format)
    {
        const auto &str = RawTypeName<int>();
        for (std::size_t i = 0;; i++)
        {
            if (str[i] == 'i' && str[i+1] == 'n' && str[i+2] == 't')
            {
                if (format)
                {
                    format->leading_junk = i;
                    format->trailing_junk = sizeof(str)-i-3-1; // `3` is the length of "int", `1` is the space for the null terminator.
                }
                return true;
            }
        }
        return false;
    }

    inline static constexpr RawTypeNameFormat format =
    []{
        static_assert(GetRawTypeNameFormat(nullptr), "Unable to figure out how to generate type names on this compiler.");
        RawTypeNameFormat format;
        GetRawTypeNameFormat(&format);
        return format;
    }();
}

// Returns the type name in a `std::array<char, N>` (null-terminated).
template <typename T>
[[nodiscard]] constexpr auto CexprTypeName()
{
    constexpr std::size_t len = sizeof(impl::RawTypeName<T>()) - impl::format.leading_junk - impl::format.trailing_junk;
    std::array<char, len> name{};
    for (std::size_t i = 0; i < len-1; i++)
        name[i] = impl::RawTypeName<T>()[i + impl::format.leading_junk];
    return name;
}

template <typename T>
[[nodiscard]] const char *TypeName()
{
    static constexpr auto name = CexprTypeName<T>();
    return name.data();
}
template <typename T>
[[nodiscard]] const char *TypeName(const T &)
{
    return TypeName<T>();
}

Where does flask look for image files?

for importing the image in flask you want a sub folder named static into the folder keep your img

and go into your html file and write

How do I make a transparent border with CSS?

Many of you must be landing here to find a solution for opaque border instead of a transparent one. In that case you can use rgba, where a stands for alpha.

.your_class {
    height: 100px;
    width: 100px;
    margin: 100px;
    border: 10px solid rgba(255,255,255,.5);
}

Demo

Here, you can change the opacity of the border from 0-1


If you simply want a complete transparent border, the best thing to use is transparent, like border: 1px solid transparent;

How to do case insensitive string comparison?

I have recently created a micro library that provides case-insensitive string helpers: https://github.com/nickuraltsev/ignore-case. (It uses toUpperCase internally.)

var ignoreCase = require('ignore-case');

ignoreCase.equals('FOO', 'Foo'); // => true
ignoreCase.startsWith('foobar', 'FOO'); // => true
ignoreCase.endsWith('foobar', 'BaR'); // => true
ignoreCase.includes('AbCd', 'c'); // => true
ignoreCase.indexOf('AbCd', 'c'); // => 2

How to properly import a selfsigned certificate into Java keystore that is available to all Java applications by default?

This worked for me. :)

sudo keytool -importcert -file filename.cer -alias randomaliasname -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit 

AutoComplete TextBox in WPF

Nimgoble's is the version I used in 2015. Thought I'd put it here as this question was top of the list in google for "wpf autocomplete textbox"

  1. Install nuget package for project in Visual Studio

  2. Add a reference to the library in the xaml:
    xmlns:behaviors="clr-namespace:WPFTextBoxAutoComplete;assembly=WPFTextBoxAutoComplete"

  3. Create a textbox and bind the AutoCompleteBehaviour to List<String> (TestItems):
    <TextBox Text="{Binding TestText, UpdateSourceTrigger=PropertyChanged}" behaviors:AutoCompleteBehavior.AutoCompleteItemsSource="{Binding TestItems}" />

IMHO this is much easier to get started and manage than the other options listed above.

VBScript How can I Format Date?

This snippet also solve this question with datePart function. I've also used the right() trick to perform a rpad(x,2,"0").

option explicit

Wscript.Echo "Today is " & myDate(now)

' date formatted as your request
Function myDate(dt)
    dim d,m,y, sep
    sep = "-"
    ' right(..) here works as rpad(x,2,"0")
    d = right("0" & datePart("d",dt),2)
    m = right("0" & datePart("m",dt),2)
    y = datePart("yyyy",dt)
    myDate= m & sep & d & sep & y
End Function

Sort matrix according to first column in R

The accepted answer works like a charm unless you're applying it to a vector. Since a vector is non-recursive, you'll get an error like this

$ operator is invalid for atomic vectors

You can use [ in that case

foo[order(foo["V1"]),]

Will using 'var' affect performance?

I don't think you properly understood what you read. If it gets compiled to the correct type, then there is no difference. When I do this:

var i = 42;

The compiler knows it's an int, and generate code as if I had written

int i = 42;

As the post you linked to says, it gets compiled to the same type. It's not a runtime check or anything else requiring extra code. The compiler just figures out what the type must be, and uses that.

Check if a key is down?

Is there a way to detect if a key is currently down in JavaScript?

Nope. The only possibility is monitoring each keyup and keydown and remembering.

after some period of time the key begins to repeat, firing off keydown and keyup events like a fiend.

It shouldn't. You'll definitely get keypress repeating, and in many browsers you'll also get repeated keydown, but if keyup repeats, it's a bug.

Unfortunately it is not a completely unheard-of bug: on Linux, Chromium, and Firefox (when it is being run under GTK+, which it is in popular distros such as Ubuntu) both generate repeating keyup-keypress-keydown sequences for held keys, which are impossible to distinguish from someone hammering the key really fast.

PHP String to Float

You want the non-locale-aware floatval function:

float floatval ( mixed $var ) - Gets the float value of a string.

Example:

$string = '122.34343The';
$float  = floatval($string);
echo $float; // 122.34343

The ScriptManager must appear before any controls that need it

It simply wants the ASP control on your ASPX page. I usually place mine right under the tag, or inside first Content area in the master's body (if your using a master page)

<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="scriptManager" runat="server"></asp:ScriptManager>
        <div>
            [Content]
        </div>
    </form>
</body>

How to remove all leading zeroes in a string

Regex was proposed already, but not correctly:

<?php
    $number = '00000004523423400023402340240';
    $withoutLeadingZeroes = preg_replace('/^0+/', '', $number)
    echo $withoutLeadingZeroes;
?>

output is then:

4523423400023402340240

Background on Regex: the ^ signals beginning of string and the + sign signals more or none of the preceding sign. Therefore, the regex ^0+ matches all zeroes at the beginning of a string.

Update GCC on OSX

If you install macports you can install gcc select, and then choose your gcc version.

/opt/local/bin/port install gcc_select

To see your versions use

port select --list gcc

To select a version use

sudo port select --set gcc gcc40

Getting an error "fopen': This function or variable may be unsafe." when compling

This is not an error, it is a warning from your Microsoft compiler.

Select your project and click "Properties" in the context menu.

In the dialog, chose Configuration Properties -> C/C++ -> Preprocessor

In the field PreprocessorDefinitions add ;_CRT_SECURE_NO_WARNINGS to turn those warnings off.

merge two object arrays with Angular 2 and TypeScript?

The spread operator is kinda cool.

this.results = [ ...this.results, ...data.results];

The spread operator allows you to easily place an expanded version of an array into another array.

You can read about spread operator here.

How to understand nil vs. empty vs. blank in Ruby

.nil? can be used on any object and is true if the object is nil.

.empty? can be used on strings, arrays and hashes and returns true if:

  • String length == 0
  • Array length == 0
  • Hash length == 0

Running .empty? on something that is nil will throw a NoMethodError.

That is where .blank? comes in. It is implemented by Rails and will operate on any object as well as work like .empty? on strings, arrays and hashes.

nil.blank? == true
false.blank? == true
[].blank? == true
{}.blank? == true
"".blank? == true
5.blank? == false
0.blank? == false

.blank? also evaluates true on strings which are non-empty but contain only whitespace:

"  ".blank? == true
"  ".empty? == false

Rails also provides .present?, which returns the negation of .blank?.

Array gotcha: blank? will return false even if all elements of an array are blank. To determine blankness in this case, use all? with blank?, for example:

[ nil, '' ].blank? == false
[ nil, '' ].all? &:blank? == true 

How to execute a Ruby script in Terminal?

For those not getting a solution for older answers, i simply put my file name as the very first line in my code.

like so

 #ruby_file_name_here.rb

 puts "hello world"

Get size of folder or file

Here's the best way to get a general File's size (works for directory and non-directory):

public static long getSize(File file) {
    long size;
    if (file.isDirectory()) {
        size = 0;
        for (File child : file.listFiles()) {
            size += getSize(child);
        }
    } else {
        size = file.length();
    }
    return size;
}

Edit: Note that this is probably going to be a time-consuming operation. Don't run it on the UI thread.

Also, here (taken from https://stackoverflow.com/a/5599842/1696171) is a nice way to get a user-readable String from the long returned:

public static String getReadableSize(long size) {
    if(size <= 0) return "0";
    final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
    int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups))
            + " " + units[digitGroups];
}

node.js TypeError: path must be absolute or specify root to res.sendFile [failed to parse JSON]

You might consider using double slashes on your directory e.g

_x000D_
_x000D_
app.get('/',(req,res)=>{_x000D_
    res.sendFile('C:\\Users\\DOREEN\\Desktop\\Fitness Finder' + '/index.html')_x000D_
})
_x000D_
_x000D_
_x000D_

Finish all previous activities

    Intent i1=new Intent(getApplicationContext(),StartUp_Page.class);
i1.setAction(Intent.ACTION_MAIN);
i1.addCategory(Intent.CATEGORY_HOME);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i1);
finish();

Multiple types were found that match the controller named 'Home'

You can also get the 500 error if you add your own assembly that contains the ApiController by overriding GetAssemblies of the DefaultAssembliesResolver and it is already in the array from base.GetAssemblies()

Case in point:

public class MyAssembliesResolver : DefaultAssembliesResolver
{
    public override ICollection<Assembly> GetAssemblies()
    {
        var baseAssemblies = base.GetAssemblies();

        var assemblies = new List<Assembly>(baseAssemblies);

        assemblies.Add(Assembly.GetAssembly(typeof(MyAssembliesResolver)));

        return new List<Assembly>(assemblies);
    }
}

if the above code is in the same assembly as your Controller, that assembly will be in the list twice and will generate a 500 error since the Web API doesn't know which one to use.

XmlWriter to Write to a String Instead of to a File

Use StringBuilder:

var sb = new StringBuilder();
    using (XmlWriter xmlWriter = XmlWriter.Create(sb))
    {
        ...
    }
return sb.ToString();

How do I do a HTTP GET in Java?

If you want to stream any webpage, you can use the method below.

import java.io.*;
import java.net.*;

public class c {

   public static String getHTML(String urlToRead) throws Exception {
      StringBuilder result = new StringBuilder();
      URL url = new URL(urlToRead);
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.setRequestMethod("GET");
      try (var reader = new BufferedReader(
                  new InputStreamReader(conn.getInputStream()))) {
          for (String line; (line = reader.readLine()) != null; ) {
              result.append(line);
          }
      }
      return result.toString();
   }

   public static void main(String[] args) throws Exception
   {
     System.out.println(getHTML(args[0]));
   }
}

How to spawn a process and capture its STDOUT in .NET?

Here's some full and simple code to do this. This worked fine when I used it.

var processStartInfo = new ProcessStartInfo
{
    FileName = @"C:\SomeProgram",
    Arguments = "Arguments",
    RedirectStandardOutput = true,
    UseShellExecute = false
};
var process = Process.Start(processStartInfo);
var output = process.StandardOutput.ReadToEnd();
process.WaitForExit();

Note that this only captures standard output; it doesn't capture standard error. If you want both, use this technique for each stream.

Why are my PowerShell scripts not running?

On Windows 10: Click change security property of myfile.ps1 and change "allow access" by right click / properties on myfile.ps1

Select values of checkbox group with jQuery

Use .map() (adapted from the example at http://api.jquery.com/map/):

var values = $("input[name='user_group[]']:checked").map(function(index,domElement) {
    return $(domElement).val();
});

How do I tokenize a string sentence in NLTK?

As @PavelAnossov answered, the canonical answer, use the word_tokenize function in nltk:

from nltk import word_tokenize
sent = "This is my text, this is a nice way to input text."
word_tokenize(sent)

If your sentence is truly simple enough:

Using the string.punctuation set, remove punctuation then split using the whitespace delimiter:

import string
x = "This is my text, this is a nice way to input text."
y = "".join([i for i in x if not in string.punctuation]).split(" ")
print y

PowerShell Connect to FTP server and get files

Invoke-WebRequest can download HTTP, HTTPS, and FTP links.

$source = 'ftp://Blah.com/somefile.txt'
$target = 'C:\Users\someuser\Desktop\BlahFiles\somefile.txt'
$password = Microsoft.PowerShell.Security\ConvertTo-SecureString -String 'mypassword' -AsPlainText -Force
$credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList myuserid, $password

# Download
Invoke-WebRequest -Uri $source -OutFile $target -Credential $credential -UseBasicParsing

Since the cmdlet uses IE parsing you may need the -UseBasicParsing switch. Test to make sure.

How do I check for vowels in JavaScript?

benchmark

I think you can safely say a for loop is faster.

I do admit that a regexp looks cleaner in terms of code. If it's a real bottleneck then use a for loop, otherwise stick with the regular expression for reasons of "elegance"

If you want to go for simplicity then just use

function isVowel(c) {
    return ['a', 'e', 'i', 'o', 'u'].indexOf(c.toLowerCase()) !== -1
}

Android: Changing Background-Color of the Activity (Main View)

i don't know if it's the answer to your question but you can try setting the background color in the xml layout like this. It is easy, it always works

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

 android:background="0xfff00000"

  >


<TextView

    android:id="@+id/text_view"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="@string/hello"

    />



</LinearLayout>

You can also do more fancy things with backgrounds by creating an xml background file with gradients which are cool and semi transparent, and refer to it for other use see example below:

the background.xml layout

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
    <shape>
        <gradient
            android:angle="90"
            android:startColor="#f0000000"
            android:endColor="#ff444444"
            android:type="linear" />
    </shape>
</item>
</selector>

your layout

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

 android:background="@layout/background"


    >


<TextView

    android:id="@+id/text_view"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="@string/hello"

    />



</LinearLayout>

Disabling SSL Certificate Validation in Spring RestTemplate

You can use this with HTTPClient API.

public RestTemplate getRestTemplateBypassingHostNameVerifcation() {
    CloseableHttpClient httpClient = HttpClients.custom().setSSLHostnameVerifier(new NoopHostnameVerifier()).build();
    HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
    requestFactory.setHttpClient(httpClient);
    return new RestTemplate(requestFactory);

}

How do I make XAML DataGridColumns fill the entire DataGrid?

If you use Width="*" the column will fill to expand the available space.

If you want all columns to divide the grid equally apply this to all columns. If you just want one to fill the remaining space just apply it to that column with the rest being "Auto" or a specific width.

You can also use Width="0.25*" (for example) if you want the column to take up 1/4 of the available width.

React Modifying Textarea Values

I think you want something along the line of:

Parent:

<Editor name={this.state.fileData} />

Editor:

var Editor = React.createClass({
  displayName: 'Editor',
  propTypes: {
    name: React.PropTypes.string.isRequired
  },
  getInitialState: function() { 
    return {
      value: this.props.name
    };
  },
  handleChange: function(event) {
    this.setState({value: event.target.value});
  },
  render: function() {
    return (
      <form id="noter-save-form" method="POST">
        <textarea id="noter-text-area" name="textarea" value={this.state.value} onChange={this.handleChange} />
        <input type="submit" value="Save" />
      </form>
    );
  }
});

This is basically a direct copy of the example provided on https://facebook.github.io/react/docs/forms.html

Update for React 16.8:

import React, { useState } from 'react';

const Editor = (props) => {
    const [value, setValue] = useState(props.name);

    const handleChange = (event) => {
        setValue(event.target.value);
    };

    return (
        <form id="noter-save-form" method="POST">
            <textarea id="noter-text-area" name="textarea" value={value} onChange={handleChange} />
            <input type="submit" value="Save" />
        </form>
    );
}

Editor.propTypes = {
    name: PropTypes.string.isRequired
};

REST API Best practices: Where to put parameters?

According to the URI standard the path is for hierarchical parameters and the query is for non-hierarchical parameters. Ofc. it can be very subjective what is hierarchical for you.

In situations where multiple URIs are assigned to the same resource I like to put the parameters - necessary for identification - into the path and the parameters - necessary to build the representation - into the query. (For me this way it is easier to route.)

For example:

  • /users/123 and /users/123?fields="name, age"
  • /users and /users?name="John"&age=30

For map reduce I like to use the following approaches:

  • /users?name="John"&age=30
  • /users/name:John/age:30

So it is really up to you (and your server side router) how you construct your URIs.

note: Just to mention these parameters are query parameters. So what you are really doing is defining a simple query language. By complex queries (which contain operators like and, or, greater than, etc.) I suggest you to use an already existing query language. The capabilities of URI templates are very limited...

How can I retrieve Id of inserted entity using Entity framework?

I come across a situation where i need to insert the data in the database & simultaneously require the primary id using entity framework. Solution :

long id;
IGenericQueryRepository<myentityclass, Entityname> InfoBase = null;
try
 {
    InfoBase = new GenericQueryRepository<myentityclass, Entityname>();
    InfoBase.Add(generalinfo);
    InfoBase.Context.SaveChanges();
    id = entityclassobj.ID;
    return id;
 }

jquery - Check for file extension before uploading

You can achieve this using JQuery

HTML

 <input type="file" id="FilUploader" />

JQuery

    $("#FilUploader").change(function () {
        var fileExtension = ['jpeg', 'jpg', 'png', 'gif', 'bmp'];
        if ($.inArray($(this).val().split('.').pop().toLowerCase(), fileExtension) == -1) {
            alert("Only formats are allowed : "+fileExtension.join(', '));
        }
    });

For more info Click Here

Export pictures from excel file into jpg using VBA

If i remember correctly, you need to use the "Shapes" property of your sheet.

Each Shape object has a TopLeftCell and BottomRightCell attributes that tell you the position of the image.

Here's a piece of code i used a while ago, roughly adapted to your needs. I don't remember the specifics about all those ChartObjects and whatnot, but here it is:

For Each oShape In ActiveSheet.Shapes
    strImageName = ActiveSheet.Cells(oShape.TopLeftCell.Row, 1).Value
    oShape.Select
    'Picture format initialization
    Selection.ShapeRange.PictureFormat.Contrast = 0.5: Selection.ShapeRange.PictureFormat.Brightness = 0.5: Selection.ShapeRange.PictureFormat.ColorType = msoPictureAutomatic: Selection.ShapeRange.PictureFormat.TransparentBackground = msoFalse: Selection.ShapeRange.Fill.Visible = msoFalse: Selection.ShapeRange.Line.Visible = msoFalse: Selection.ShapeRange.Rotation = 0#: Selection.ShapeRange.PictureFormat.CropLeft = 0#: Selection.ShapeRange.PictureFormat.CropRight = 0#: Selection.ShapeRange.PictureFormat.CropTop = 0#: Selection.ShapeRange.PictureFormat.CropBottom = 0#: Selection.ShapeRange.ScaleHeight 1#, msoTrue, msoScaleFromTopLeft: Selection.ShapeRange.ScaleWidth 1#, msoTrue, msoScaleFromTopLeft
    '/Picture format initialization
    Application.Selection.CopyPicture
    Set oDia = ActiveSheet.ChartObjects.Add(0, 0, oShape.Width, oShape.Height)
    Set oChartArea = oDia.Chart
    oDia.Activate
    With oChartArea
        .ChartArea.Select
        .Paste
        .Export ("H:\Webshop_Zpider\Strukturbildene\" & strImageName & ".jpg")
    End With
    oDia.Delete 'oChartArea.Delete
Next

Clear image on picturebox

I used this method to clear the image from picturebox. It may help some one

private void btnClear1_Click(object sender, EventArgs e)
        {

            img1.ImageLocation = null;
        }

Java: parse int value from a char

Try the following:

str1="2345";
int x=str1.charAt(2)-'0';
//here x=4;

if u subtract by char '0', the ASCII value needs not to be known.

how to align img inside the div to the right?

You can give the surrounding div a

text-align: right

this will leave white space to the left of the image. (= the image will occupy the whole line).

If you want content to be shown to the left hand side of the image, use

float: right

on the image. However, the surrounding div will then need overflow: auto to stretch to the needed height.

how to add value to combobox item

Although this question is 5 years old I have come across a nice solution.

Use the 'DictionaryEntry' object to pair keys and values.

Set the 'DisplayMember' and 'ValueMember' properties to:

   Me.myComboBox.DisplayMember = "Key"
   Me.myComboBox.ValueMember = "Value"

To add items to the ComboBox:

   Me.myComboBox.Items.Add(New DictionaryEntry("Text to be displayed", 1))

To retreive items like this:

MsgBox(Me.myComboBox.SelectedItem.Key & " " & Me.myComboBox.SelectedItem.Value)

Java, Simplified check if int array contains int

You can use java.util.Arrays class to transform the array T[?] in a List<T> object with methods like contains:

Arrays.asList(int[] array).contains(int key);

regex match any single character (one character only)

Match any single character

  • Use the dot . character as a wildcard to match any single character.

Example regex: a.c

abc   // match
a c   // match
azc   // match
ac    // no match
abbc  // no match

Match any specific character in a set

  • Use square brackets [] to match any characters in a set.
  • Use \w to match any single alphanumeric character: 0-9, a-z, A-Z, and _ (underscore).
  • Use \d to match any single digit.
  • Use \s to match any single whitespace character.

Example 1 regex: a[bcd]c

abc   // match
acc   // match
adc   // match
ac    // no match
abbc  // no match

Example 2 regex: a[0-7]c

a0c   // match
a3c   // match
a7c   // match
a8c   // no match
ac    // no match
a55c  // no match

Match any character except ...

Use the hat in square brackets [^] to match any single character except for any of the characters that come after the hat ^.

Example regex: a[^abc]c

aac   // no match
abc   // no match
acc   // no match
a c   // match
azc   // match
ac    // no match
azzc  // no match

(Don't confuse the ^ here in [^] with its other usage as the start of line character: ^ = line start, $ = line end.)

Match any character optionally

Use the optional character ? after any character to specify zero or one occurrence of that character. Thus, you would use .? to match any single character optionally.

Example regex: a.?c

abc   // match
a c   // match
azc   // match
ac    // match
abbc  // no match

See also

How can moment.js be imported with typescript?

Still broken? Try uninstalling @types/moment.

So, I removed @types/moment package from the package.json file and it worked using:

import * as moment from 'moment'

Newer versions of moment don't require the @types/moment package as types are already included.

Convert data.frame column format from character to factor

You could use dplyr::mutate_if() to convert all character columns or dplyr::mutate_at() for select named character columns to factors:

library(dplyr)

# all character columns to factor:
df <- mutate_if(df, is.character, as.factor)

# select character columns 'char1', 'char2', etc. to factor:
df <- mutate_at(df, vars(char1, char2), as.factor)

How can I create a link to a local file on a locally-run web page?

back to 2017:

use URL.createObjectURL( file ) to create local link to file system that user select;

don't forgot to free memory by using URL.revokeObjectURL()

Angular2 : Can't bind to 'formGroup' since it isn't a known property of 'form'

For those still struggling with the error, make sure that you also import ReactiveFormsModule in your component 's module.ts file

meaning that you will import your ReactiveFormsModule in your app.module.ts and also in your mycomponent.module.ts file

Efficiently getting all divisors of a given number

Here is the Java Implementation of this approach:

public static int countAllFactors(int num)
{
    TreeSet<Integer> tree_set = new TreeSet<Integer>();
    for (int i = 1; i * i <= num; i+=1)
    {
        if (num % i == 0)
        {
            tree_set.add(i);
            tree_set.add(num / i);
        }
    }
    System.out.print(tree_set);
    return tree_set.size();
}

Google Maps Api v3 - find nearest markers

Here is another function that works great for me, returns distance in kilometers:

 function distance(lat1, lng1, lat2, lng2) {
        var radlat1 = Math.PI * lat1 / 180;
        var radlat2 = Math.PI * lat2 / 180;
        var radlon1 = Math.PI * lng1 / 180;
        var radlon2 = Math.PI * lng2 / 180;
        var theta = lng1 - lng2;
        var radtheta = Math.PI * theta / 180;
        var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
        dist = Math.acos(dist);
        dist = dist * 180 / Math.PI;
        dist = dist * 60 * 1.1515;

        //Get in in kilometers
        dist = dist * 1.609344;

        return dist;
    }

Proper way to declare custom exceptions in modern Python?

A really simple approach:

class CustomError(Exception):
    pass

raise CustomError("Hmm, seems like this was custom coded...")

Or, have the error raise without printing __main__ (may look cleaner and neater):

class CustomError(Exception):
    __module__ = Exception.__module__

raise CustomError("Improved CustomError!")

NSAttributedString add text alignment

As NSAttributedString is primarily used with Core Text on iOS, you have to use CTParagraphStyle instead of NSParagraphStyle. There is no mutable variant.

For example:

CTTextAlignment alignment = kCTCenterTextAlignment;

CTParagraphStyleSetting alignmentSetting;
alignmentSetting.spec = kCTParagraphStyleSpecifierAlignment;
alignmentSetting.valueSize = sizeof(CTTextAlignment);
alignmentSetting.value = &alignment;

CTParagraphStyleSetting settings[1] = {alignmentSetting};

size_t settingsCount = 1;
CTParagraphStyleRef paragraphRef = CTParagraphStyleCreate(settings, settingsCount);
NSDictionary *attributes = @{(__bridge id)kCTParagraphStyleAttributeName : (__bridge id)paragraphRef};
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:@"Hello World" attributes:attributes];

HTML / CSS Popup div on text click

For the sake of completeness, what you are trying to create is a "modal window".

Numerous JS solutions allow you to create them with ease, take the time to find the one which best suits your needs.

I have used Tinybox 2 for small projects : http://sandbox.scriptiny.com/tinybox2/

How to force uninstallation of windows service

It is also worth noting that this:

sc delete "ServiceName"

does not work in PowerShell, sc is an alias for the cmdlet Set-Content in PowerShell. You need to do:

sc.exe delete "ServiceName"

What are CN, OU, DC in an LDAP search?

At least with Active Directory, I have been able to search by DistinguishedName by doing an LDAP query in this format (assuming that such a record exists with this distinguishedName):

"(distinguishedName=CN=Dev-India,OU=Distribution Groups,DC=gp,DC=gl,DC=google,DC=com)"

search in java ArrayList

Personally I rarely write loops myself now when I can get away with it... I use the Jakarta commons libs:

Customer findCustomerByid(final int id){
    return (Customer) CollectionUtils.find(customers, new Predicate() {
        public boolean evaluate(Object arg0) {
            return ((Customer) arg0).getId()==id;
        }
    });
}

Yay! I saved one line!

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes)

Well try ini_set('memory_limit', '256M');

134217728 bytes = 128 MB

Or rewrite the code to consume less memory.

error LNK2005: xxx already defined in MSVCRT.lib(MSVCR100.dll) C:\something\LIBCMT.lib(setlocal.obj)

Some readers will have another issue and need this fix. read the links below. the same problem occured with visual studio 2015 with the advent of windows sdk 10 which brings up libucrt. ucrt is the windows implementation of C Runtime (CRT) aka the posix runtime library. You most likely have code that was ported from unix... Welcome to the drawback

https://support.microsoft.com/en-us/help/148652/a-lnk2005-error-occurs-when-the-crt-library-and-mfc-libraries-are-linked-in-the-wrong-order-in-visual-c

https://github.com/lordmulder/libsndfile-MSVC/blob/master/src/sf_unistd.h

https://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00224.html

https://msdn.microsoft.com/en-us/library/y23kc048.aspx

https://blogs.msdn.microsoft.com/vcblog/2015/03/03/introducing-the-universal-crt/

Hibernate: best practice to pull all lazy collections

There are some kind of misunderstanding about lazy collections in JPA-Hibernate. First of all let's clear that why trying to read a lazy collection throws exceptions and not just simply returns NULL for converting or further use cases?.

That's because Null fields in Databases especially in joined columns have meaning and not simply not-presented state, like programming languages. when you're trying to interpret a lazy collection to Null value it means (on Datastore-side) there is no relations between these entities and it's not true. so throwing exception is some kind of best-practice and you have to deal with that not the Hibernate.

So as mentioned above I recommend to :

  1. Detach the desired object before modifying it or using stateless session for querying
  2. Manipulate lazy fields to desired values (zero,null,etc.)

also as described in other answers there are plenty of approaches(eager fetch, joining etc.) or libraries and methods for doing that, but you have to setting up your view of what's happening before dealing with the problem and solving it.

What is the difference between '@' and '=' in directive scope in AngularJS?

Even when the scope is local, as in your example, you may access the parent scope through the property $parent. Assume in the code below, that title is defined on the parent scope. You may then access title as $parent.title:

link : function(scope) { console.log(scope.$parent.title) },
template : "the parent has the title {{$parent.title}}"

However in most cases the same effect is better obtained using attributes.

An example of where I found the "&" notation, which is used "to pass data from the isolated scope via an expression and to the parent scope", useful (and a two-way databinding could not be used) was in a directive for rendering a special datastructure inside an ng-repeat.

<render data = "record" deleteFunction = "dataList.splice($index,1)" ng-repeat = "record in dataList" > </render>

One part of the rendering was a delete button and here it was useful to attach a deletefunction from the outside scope via &. Inside the render-directive it looks like

scope : { data = "=", deleteFunction = "&"},
template : "... <button ng-click = "deleteFunction()"></button>"

2-way databinding i.e. data = "=" can not be used as the delete function would run on every $digest cycle, which is not good, as the record is then immediately deleted and never rendered.

R command for setting working directory to source file location in Rstudio

To get the location of a script being sourced, you can use utils::getSrcDirectory or utils::getSrcFilename. So changing the working directory to that of the current file can be done with:

setwd(getSrcDirectory()[1])

This does not work in RStudio if you Run the code rather than Sourceing it. For that, you need to use rstudioapi::getActiveDocumentContext.

setwd(dirname(rstudioapi::getActiveDocumentContext()$path))

This second solution requires that you are using RStudio as your IDE, of course.

How to execute my SQL query in CodeIgniter

http://www.bsourcecode.com/codeigniter/codeigniter-select-query/

$query = $this->db->query("select * from tbl_user");

OR

$query = $this->db->select("*");
            $this->db->from('table_name');
            $query=$this->db->get();

How to solve java.lang.OutOfMemoryError trouble in Android

If you are getting this Error java.lang.OutOfMemoryError this is the most common problem occurs in Android. This error is thrown by the Java Virtual Machine (JVM) when an object cannot be allocated due to lack of memory space.

Try this android:hardwareAccelerated="false" , android:largeHeap="true"in your manifest.xml file under application like this:

<application
  android:name=".MyApplication"
  android:allowBackup="true"
  android:icon="@mipmap/ic_launcher"
  android:label="@string/app_name"
  android:theme="@style/AppTheme"
  android:hardwareAccelerated="false"
  android:largeHeap="true" />

java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter

my case seems to be invalid JRE version.

1.7+ required while I launched with 1.6

plus: I filtered some plugin jars which might be required. so changed to select all

hadoop No FileSystem for scheme: file

I assume you build sample using maven.

Please check content of the JAR you're trying to run. Especially META-INFO/services directory, file org.apache.hadoop.fs.FileSystem. There should be list of filsystem implementation classes. Check line org.apache.hadoop.hdfs.DistributedFileSystem is present in the list for HDFS and org.apache.hadoop.fs.LocalFileSystem for local file scheme.

If this is the case, you have to override referred resource during the build.

Other possibility is you simply don't have hadoop-hdfs.jar in your classpath but this has low probability. Usually if you have correct hadoop-client dependency it is not an option.

How do I shrink my SQL Server Database?

You also have to modify the minimum size of the data and log files. DBCC SHRINKDATABASE will shrink the data inside the files you already have allocated. To shrink a file to a size smaller than its minimum size, use DBCC SHRINKFILE and specify the new size.

Convert string into Date type on Python

Use datetime.datetime.strptime:

>>> import datetime
>>> date = datetime.datetime.strptime('2012-02-10', '%Y-%m-%d')
>>> date.isoweekday()
5

Create iOS Home Screen Shortcuts on Chrome for iOS

Can't change the default browser, but try this (found online a while ago). Add a bookmark in Safari called "Open in Chrome" with the following.

javascript:location.href=%22googlechrome%22+location.href.substring(4);

Will open the current page in Chrome. Not as convenient, but maybe someone will find it useful.

Source

Works for me.

PHP Fatal error: Class 'PDO' not found

Its a Little Late but I found the same problem and i fixed it by a "\" in front of PDO

public function enabled() {
    return in_array('mysql', \PDO::getAvailableDrivers());
}

How to change target build on Android project?

I had this problem too. What worked for me was to first un-check the previously selected SDK version before checking the new desired version. Then click okay.

Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

Have you tried moving the reduction step outside the loop? Right now you have a data dependency that really isn't needed.

Try:

  uint64_t subset_counts[4] = {};
  for( unsigned k = 0; k < 10000; k++){
     // Tight unrolled loop with unsigned
     unsigned i=0;
     while (i < size/8) {
        subset_counts[0] += _mm_popcnt_u64(buffer[i]);
        subset_counts[1] += _mm_popcnt_u64(buffer[i+1]);
        subset_counts[2] += _mm_popcnt_u64(buffer[i+2]);
        subset_counts[3] += _mm_popcnt_u64(buffer[i+3]);
        i += 4;
     }
  }
  count = subset_counts[0] + subset_counts[1] + subset_counts[2] + subset_counts[3];

You also have some weird aliasing going on, that I'm not sure is conformant to the strict aliasing rules.

How do I convert a Django QuerySet into list of dicts?

You do not exactly define what the dictionaries should look like, but most likely you are referring to QuerySet.values(). From the official django documentation:

Returns a ValuesQuerySet — a QuerySet subclass that returns dictionaries when used as an iterable, rather than model-instance objects.

Each of those dictionaries represents an object, with the keys corresponding to the attribute names of model objects.

java, get set methods

To understand get and set, it's all related to how variables are passed between different classes.

The get method is used to obtain or retrieve a particular variable value from a class.

A set value is used to store the variables.

The whole point of the get and set is to retrieve and store the data values accordingly.

What I did in this old project was I had a User class with my get and set methods that I used in my Server class.

The User class's get set methods:

public int getuserID()
    {
        //getting the userID variable instance
        return userID;
    }
    public String getfirstName()
    {
        //getting the firstName variable instance
        return firstName;
    }
    public String getlastName()
    {
        //getting the lastName variable instance
        return lastName;
    }
    public int getage()
    {
        //getting the age variable instance
        return age;
    }

    public void setuserID(int userID)
    {
        //setting the userID variable value
        this.userID = userID;
    }
    public void setfirstName(String firstName)
    {
        //setting the firstName variable text
        this.firstName = firstName;
    }
    public void setlastName(String lastName)
    {
        //setting the lastName variable text
        this.lastName = lastName;
    }
    public void setage(int age)
    {
        //setting the age variable value
        this.age = age;
    }
}

Then this was implemented in the run() method in my Server class as follows:

//creates user object
                User use = new User(userID, firstName, lastName, age);
                //Mutator methods to set user objects
                use.setuserID(userID);
                use.setlastName(lastName);
                use.setfirstName(firstName);               
                use.setage(age); 

Laravel - Session store not set on request

Do you can use ->stateless() before the ->redirect(). Then you dont need the session anymore.

No output to console from a WPF application?

I've create a solution, mixed the information of varius post.

Its a form, that contains a label and one textbox. The console output is redirected to the textbox.

There are too a class called ConsoleView that implements three publics methods: Show(), Close(), and Release(). The last one is for leave open the console and activate the Close button for view results.

The forms is called FrmConsole. Here are the XAML and the c# code.

The use is very simple:

ConsoleView.Show("Title of the Console");

For open the console. Use:

System.Console.WriteLine("The debug message");

For output text to the console.

Use:

ConsoleView.Close();

For Close the console.

ConsoleView.Release();

Leaves open the console and enables the Close button

XAML

<Window x:Class="CustomControls.FrmConsole"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:CustomControls"
    mc:Ignorable="d"
    Height="500" Width="600" WindowStyle="None" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Topmost="True" Icon="Images/icoConsole.png">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="40"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="40"/>
    </Grid.RowDefinitions>
    <Label Grid.Row="0" Name="lblTitulo" HorizontalAlignment="Center" HorizontalContentAlignment="Center" VerticalAlignment="Center" VerticalContentAlignment="Center" FontFamily="Arial" FontSize="14" FontWeight="Bold" Content="Titulo"/>
    <Grid Grid.Row="1">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="10"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="10"/>
        </Grid.ColumnDefinitions>
        <TextBox Grid.Column="1" Name="txtInner" FontFamily="Arial" FontSize="10" ScrollViewer.CanContentScroll="True" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible" TextWrapping="Wrap"/>
    </Grid>
    <Button Name="btnCerrar" Grid.Row="2" Content="Cerrar" Width="100" Height="30" HorizontalAlignment="Center" HorizontalContentAlignment="Center" VerticalAlignment="Center" VerticalContentAlignment="Center"/>
</Grid>

The code of the Window:

partial class FrmConsole : Window
{
    private class ControlWriter : TextWriter
    {
        private TextBox textbox;
        public ControlWriter(TextBox textbox)
        {
            this.textbox = textbox;
        }

        public override void WriteLine(char value)
        {
            textbox.Dispatcher.Invoke(new Action(() =>
            {
                textbox.AppendText(value.ToString());
                textbox.AppendText(Environment.NewLine);
                textbox.ScrollToEnd();
            }));
        }

        public override void WriteLine(string value)
        {
            textbox.Dispatcher.Invoke(new Action(() =>
            {
                textbox.AppendText(value);
                textbox.AppendText(Environment.NewLine);
                textbox.ScrollToEnd();
            }));
        }

        public override void Write(char value)
        {
            textbox.Dispatcher.Invoke(new Action(() =>
            {
                textbox.AppendText(value.ToString());
                textbox.ScrollToEnd();
            }));
        }

        public override void Write(string value)
        {
            textbox.Dispatcher.Invoke(new Action(() =>
            {
                textbox.AppendText(value);
                textbox.ScrollToEnd();
            }));
        }

        public override Encoding Encoding
        {
            get { return Encoding.UTF8; }

        }
    }

    //DEFINICIONES DE LA CLASE
    #region DEFINICIONES DE LA CLASE

    #endregion


    //CONSTRUCTORES DE LA CLASE
    #region CONSTRUCTORES DE LA CLASE

    public FrmConsole(string titulo)
    {
        InitializeComponent();
        lblTitulo.Content = titulo;
        Clear();
        btnCerrar.Click += new RoutedEventHandler(BtnCerrar_Click);
        Console.SetOut(new ControlWriter(txtInner));
        DesactivarCerrar();
    }

    #endregion


    //PROPIEDADES
    #region PROPIEDADES

    #endregion


    //DELEGADOS
    #region DELEGADOS

    private void BtnCerrar_Click(object sender, RoutedEventArgs e)
    {
        Close();
    }

    #endregion


    //METODOS Y FUNCIONES
    #region METODOS Y FUNCIONES

    public void ActivarCerrar()
    {
        btnCerrar.IsEnabled = true;
    }

    public void Clear()
    {
        txtInner.Clear();
    }

    public void DesactivarCerrar()
    {
        btnCerrar.IsEnabled = false;
    }

    #endregion  
}

the code of ConsoleView class

static public class ConsoleView
{
    //DEFINICIONES DE LA CLASE
    #region DEFINICIONES DE LA CLASE
    static FrmConsole console;
    static Thread StatusThread;
    static bool isActive = false;
    #endregion

    //CONSTRUCTORES DE LA CLASE
    #region CONSTRUCTORES DE LA CLASE

    #endregion

    //PROPIEDADES
    #region PROPIEDADES

    #endregion

    //DELEGADOS
    #region DELEGADOS

    #endregion

    //METODOS Y FUNCIONES
    #region METODOS Y FUNCIONES

    public static void Show(string label)
    {
        if (isActive)
        {
            return;
        }

        isActive = true;
        //create the thread with its ThreadStart method
        StatusThread = new Thread(() =>
        {
            try
            {
                console = new FrmConsole(label);
                console.ShowDialog();
                //this call is needed so the thread remains open until the dispatcher is closed
                Dispatcher.Run();
            }
            catch (Exception)
            {
            }
        });

        //run the thread in STA mode to make it work correctly
        StatusThread.SetApartmentState(ApartmentState.STA);
        StatusThread.Priority = ThreadPriority.Normal;
        StatusThread.Start();

    }

    public static void Close()
    {
        isActive = false;
        if (console != null)
        {
            //need to use the dispatcher to call the Close method, because the window is created in another thread, and this method is called by the main thread
            console.Dispatcher.InvokeShutdown();
            console = null;
            StatusThread = null;
        }

        console = null;
    }

    public static void Release()
    {
        isActive = false;
        if (console != null)
        {
            console.Dispatcher.Invoke(console.ActivarCerrar);
        }

    }
    #endregion
}

I hope this result usefull.

Java : Sort integer array without using Arrays.sort()

Here is one simple solution

public static void main(String[] args) {        
        //Without using Arrays.sort function
        int i;
        int nos[] = {12,9,-4,-1,3,10,34,12,11};
        System.out.print("Values before sorting: \n");
        for(i = 0; i < nos.length; i++)
            System.out.println( nos[i]+"  ");               
        sort(nos, nos.length);
        System.out.print("Values after sorting: \n");       
        for(i = 0; i <nos.length; i++){
            System.out.println(nos[i]+"  ");
        }
    }

    private static void sort(int nos[], int n) {
     for (int i = 1; i < n; i++){
          int j = i;
          int B = nos[i];
          while ((j > 0) && (nos[j-1] > B)){
            nos[j] = nos[j-1];
            j--;
          }
          nos[j] = B;
        }
    }

And the output is:

Values before sorting:

12
9
-4
-1
3
10
34
12
11

Values after sorting:

-4
-1
3
9
10
11
12
12
34

What's the yield keyword in JavaScript?

Late answering, probably everybody knows about yield now, but some better documentation has come along.

Adapting an example from "Javascript's Future: Generators" by James Long for the official Harmony standard:

function * foo(x) {
    while (true) {
        x = x * 2;
        yield x;
    }
}

"When you call foo, you get back a Generator object which has a next method."

var g = foo(2);
g.next(); // -> 4
g.next(); // -> 8
g.next(); // -> 16

So yield is kind of like return: you get something back. return x returns the value of x, but yield x returns a function, which gives you a method to iterate toward the next value. Useful if you have a potentially memory intensive procedure that you might want to interrupt during the iteration.

How do I create an executable in Visual Studio 2013 w/ C++?

  1. Click BUILD > Configuration Manager...
  2. Under Project contexts > Configuration, select "Release"
  3. BUILD > Build Solution or Rebuild Solution

excel plot against a date time x series

I know this is an old question, but I was struggling to do this with a time period over 2 hours, so this might help someone. Also, several of the answers don't actually plot against time, giving equal space whatever the duration.

Firstly, as @jameswarren says, use a scatter graph. Then right-click the horizontal axis and choose Format Axis.

Under Number, select Time, and at this point you may find your scale goes a bit crazy, because it chooses to scale the axis by days. So go back to Axis Options and select Fixed for the Minimum, Maximum and Major unit scales.

To set the unit to hours, type in 1/24 = 0.0416667 (I used half that to get half-hourly increments). To make this start at a round number, multiply it by your preferred number of hours and type that into the Minimum box. In my case 08:00 = 0.333333

graph showing plot against time on x-axis

How to switch to another domain and get-aduser

Try specifying a DC in DomainB using the -Server property. Ex:

Get-ADUser -Server "dc01.DomainB.local" -Filter {EmailAddress -like "*Smith_Karla*"} -Properties EmailAddress

jQuery : select all element with custom attribute

As described by the link I've given in comment, this

$('p[MyTag]').each(function(index) {
  document.write(index + ': ' + $(this).text() + "<br>");});

works (playable example).

Rename Excel Sheet with VBA Macro

Suggest you add handling to test if any of the sheets to be renamed already exist:

Sub Test()

Dim ws As Worksheet
Dim ws1 As Worksheet
Dim strErr As String

On Error Resume Next
For Each ws In ActiveWorkbook.Sheets
Set ws1 = Sheets(ws.Name & "_v1")
    If ws1 Is Nothing Then
        ws.Name = ws.Name & "_v1"
    Else
         strErr = strErr & ws.Name & "_v1" & vbNewLine
    End If
Set ws1 = Nothing
Next
On Error GoTo 0

If Len(strErr) > 0 Then MsgBox strErr, vbOKOnly, "these sheets already existed"

End Sub

How to reload or re-render the entire page using AngularJS

For reloading the page for a given route path :-

$location.path('/path1/path2');
$route.reload();

How can I select the row with the highest ID in MySQL?

SELECT MAX(ID) FROM tablename LIMIT 1

Use this query to find the highest ID in the MySQL table.

How to hide code from cells in ipython notebook visualized with nbviewer?

from IPython.display import HTML

HTML('''<script>
code_show=true; 
function code_toggle() {
 if (code_show){
 $('div.input').hide();
 } else {
 $('div.input').show();
 }
 code_show = !code_show
} 
$( document ).ready(code_toggle);
</script>
<form action="javascript:code_toggle()"><input type="submit" value="Click here to toggle on/off the raw code."></form>''')

Remove leading and trailing spaces?

You can use the strip() to remove trailing and leading spaces.

>>> s = '   abd cde   '
>>> s.strip()
'abd cde'

Note: the internal spaces are preserved

Writing List of Strings to Excel CSV File in Python

Very simple to fix, you just need to turn the parameter to writerow into a list.

for item in RESULTS:
     wr.writerow([item,])

CSS, Images, JS not loading in IIS

I had a similar error, my console looked like this:

error

My problem was that I was running my site in a sub folder since the company was using one top domain and no sub domains. Like this:

host.com/app1

host.com/app2

My code looked like this for including scripts which worked fine on localhost but not in app1 or app2:

<link rel="stylesheet" type="text/css" href="/Content/css/font-awesome.min.css" />

Added a tilde sign ~ to src and then everything worked:

<link rel="stylesheet" type="text/css" href="~/Content/css/font-awesome.min.css" />

Explanation of ~ vs /:

  • / - Site root
  • ~/ - Root directory of the application

/ will return the root of the site (http://host.com/),

~/ will return the root of the application (http://host.com/app1/).

Downcasting in Java

Using your example, you could do:

public void doit(A a) {
    if(a instanceof B) {
        // needs to cast to B to access draw2 which isn't present in A
        // note that this is probably not a good OO-design, but that would
        // be out-of-scope for this discussion :)
        ((B)a).draw2();
    }
    a.draw();
}

Django REST Framework: adding additional field to ModelSerializer

With the last version of Django Rest Framework, you need to create a method in your model with the name of the field you want to add. No need for @property and source='field' raise an error.

class Foo(models.Model):
    . . .
    def foo(self):
        return 'stuff'
    . . .

class FooSerializer(ModelSerializer):
    foo = serializers.ReadOnlyField()

    class Meta:
        model = Foo
        fields = ('foo',)

How do I call a specific Java method on a click/submit event of a specific button in JSP?

<form method="post" action="servletName">   
     <input type="submit" id="btn1" name="btn1"/>
     <input type="submit" id="btn2" name="btn2"/>
</form>  

on pressing it request will go to servlet on the servlet page check which button is pressed and then accordingly call the needed method as objectName.method

Android: How to change the ActionBar "Home" Icon to be something other than the app icon?

Please Try, if use "extends AppCompatActivity" and present actionbar.

 ActionBar eksinbar=getSupportActionBar();
if (eksinbar != null) {
    eksinbar.setDisplayHomeAsUpEnabled(true);
    eksinbar.setHomeAsUpIndicator(R.mipmap.imagexxx);
}

go to character in vim

vim +21490go script.py

From the command line will open the file and take you to position 21490 in the buffer.

Triggering it from the command line like this allows you to automate a script to parse the exception message and open the file to the problem position.


Excerpt from man vim:

+{command}

-c {command}

{command} will be executed after the first file has been read. {command} is interpreted as an Ex command. If the {command} contains spaces it must be enclosed in double quotes (this depends on the shell that is used).

How to dismiss keyboard for UITextView with return key?

Just solved this problem a different way.

  • Create a button that will be placed in the background
  • From the Attribute Inspector, change the button type to custom, and the makes the button transparent.
  • Expand the button to cover the whole view, and make sure the button is behind all the other object. Easy way to do this is to drag the button to the top of list view in the View
  • Control drag the button to the viewController.h file and create an action (Sent Event: Touch Up Inside) like :

    (IBAction)ExitKeyboard:(id)sender;
    
  • In ViewController.m should look like :

    (IBAction)ExitKeyboard:(id)sender {
        [self.view endEditing:TRUE];
    }
    
  • Run app, and when you click away from the TextView, the keyboard disappears

How can I convert bigint (UNIX timestamp) to datetime in SQL Server?

This is building off the work Daniel Little did for this question, but taking into account daylight savings time (works for dates 01-01 1902 and greater due to int limit on dateadd function):

We first need to create a table that will store the date ranges for daylight savings time (source: History of time in the United States):

CREATE TABLE [dbo].[CFG_DAY_LIGHT_SAVINGS_TIME](
  [BEGIN_DATE] [datetime] NULL,
  [END_DATE] [datetime] NULL,
  [YEAR_DATE] [smallint] NULL
) ON [PRIMARY]

GO

INSERT INTO CFG_DAY_LIGHT_SAVINGS_TIME VALUES
('2001-04-01 02:00:00.000',   '2001-10-27 01:59:59.997',    2001),
('2002-04-07 02:00:00.000',   '2002-10-26 01:59:59.997',    2002),
('2003-04-06 02:00:00.000',   '2003-10-25 01:59:59.997',    2003),
('2004-04-04 02:00:00.000',   '2004-10-30 01:59:59.997',    2004),
('2005-04-03 02:00:00.000',   '2005-10-29 01:59:59.997',    2005),
('2006-04-02 02:00:00.000',   '2006-10-28 01:59:59.997',    2006),
('2007-03-11 02:00:00.000',   '2007-11-03 01:59:59.997',    2007),
('2008-03-09 02:00:00.000',   '2008-11-01 01:59:59.997',    2008),
('2009-03-08 02:00:00.000',   '2009-10-31 01:59:59.997',    2009),
('2010-03-14 02:00:00.000',   '2010-11-06 01:59:59.997',    2010),
('2011-03-13 02:00:00.000',   '2011-11-05 01:59:59.997',    2011),
('2012-03-11 02:00:00.000',   '2012-11-03 01:59:59.997',    2012),
('2013-03-10 02:00:00.000',   '2013-11-02 01:59:59.997',    2013),
('2014-03-09 02:00:00.000',   '2014-11-01 01:59:59.997',    2014),
('2015-03-08 02:00:00.000',   '2015-10-31 01:59:59.997',    2015),
('2016-03-13 02:00:00.000',   '2016-11-05 01:59:59.997',    2016),
('2017-03-12 02:00:00.000',   '2017-11-04 01:59:59.997',    2017),
('2018-03-11 02:00:00.000',   '2018-11-03 01:59:59.997',    2018),
('2019-03-10 02:00:00.000',   '2019-11-02 01:59:59.997',    2019),
('2020-03-08 02:00:00.000',   '2020-10-31 01:59:59.997',    2020),
('2021-03-14 02:00:00.000',   '2021-11-06 01:59:59.997',    2021),
('2022-03-13 02:00:00.000',   '2022-11-05 01:59:59.997',    2022),
('2023-03-12 02:00:00.000',   '2023-11-04 01:59:59.997',    2023),
('2024-03-10 02:00:00.000',   '2024-11-02 01:59:59.997',    2024),
('2025-03-09 02:00:00.000',   '2025-11-01 01:59:59.997',    2025),
('1967-04-30 02:00:00.000',   '1967-10-29 01:59:59.997',    1967),
('1968-04-28 02:00:00.000',   '1968-10-27 01:59:59.997',    1968),
('1969-04-27 02:00:00.000',   '1969-10-26 01:59:59.997',    1969),
('1970-04-26 02:00:00.000',   '1970-10-25 01:59:59.997',    1970),
('1971-04-25 02:00:00.000',   '1971-10-31 01:59:59.997',    1971),
('1972-04-30 02:00:00.000',   '1972-10-29 01:59:59.997',    1972),
('1973-04-29 02:00:00.000',   '1973-10-28 01:59:59.997',    1973),
('1974-01-06 02:00:00.000',   '1974-10-27 01:59:59.997',    1974),
('1975-02-23 02:00:00.000',   '1975-10-26 01:59:59.997',    1975),
('1976-04-25 02:00:00.000',   '1976-10-31 01:59:59.997',    1976),
('1977-04-24 02:00:00.000',   '1977-10-31 01:59:59.997',    1977),
('1978-04-30 02:00:00.000',   '1978-10-29 01:59:59.997',    1978),
('1979-04-29 02:00:00.000',   '1979-10-28 01:59:59.997',    1979),
('1980-04-27 02:00:00.000',   '1980-10-26 01:59:59.997',    1980),
('1981-04-26 02:00:00.000',   '1981-10-25 01:59:59.997',    1981),
('1982-04-25 02:00:00.000',   '1982-10-25 01:59:59.997',    1982),
('1983-04-24 02:00:00.000',   '1983-10-30 01:59:59.997',    1983),
('1984-04-29 02:00:00.000',   '1984-10-28 01:59:59.997',    1984),
('1985-04-28 02:00:00.000',   '1985-10-27 01:59:59.997',    1985),
('1986-04-27 02:00:00.000',   '1986-10-26 01:59:59.997',    1986),
('1987-04-05 02:00:00.000',   '1987-10-25 01:59:59.997',    1987),
('1988-04-03 02:00:00.000',   '1988-10-30 01:59:59.997',    1988),
('1989-04-02 02:00:00.000',   '1989-10-29 01:59:59.997',    1989),
('1990-04-01 02:00:00.000',   '1990-10-28 01:59:59.997',    1990),
('1991-04-07 02:00:00.000',   '1991-10-27 01:59:59.997',    1991),
('1992-04-05 02:00:00.000',   '1992-10-25 01:59:59.997',    1992),
('1993-04-04 02:00:00.000',   '1993-10-31 01:59:59.997',    1993),
('1994-04-03 02:00:00.000',   '1994-10-30 01:59:59.997',    1994),
('1995-04-02 02:00:00.000',   '1995-10-29 01:59:59.997',    1995),
('1996-04-07 02:00:00.000',   '1996-10-27 01:59:59.997',    1996),
('1997-04-06 02:00:00.000',   '1997-10-26 01:59:59.997',    1997),
('1998-04-05 02:00:00.000',   '1998-10-25 01:59:59.997',    1998),
('1999-04-04 02:00:00.000',   '1999-10-31 01:59:59.997',    1999),
('2000-04-02 02:00:00.000',   '2000-10-29 01:59:59.997',    2000)
GO

Now we create a function for each American timezone. This is assuming the unix time is in milliseconds. If it is in seconds, remove the /1000 from the code:

Pacific

create function [dbo].[UnixTimeToPacific] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @pacificdatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @pacificdatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -7 else -8 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @pacificdatetime is null 
       select @pacificdatetime= dateadd(hour, -7, @interimdatetime)
return @pacificdatetime    
end

Eastern

create function [dbo].[UnixTimeToEastern] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @easterndatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @easterndatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -4 else -5 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @easterndatetime is null 
       select @easterndatetime= dateadd(hour, -4, @interimdatetime)
return @easterndatetime    
end

Central

create function [dbo].[UnixTimeToCentral] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @centraldatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @centraldatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -5 else -6 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @centraldatetime is null 
       select @centraldatetime= dateadd(hour, -5, @interimdatetime)
return @centraldatetime    
end

Mountain

create function [dbo].[UnixTimeToMountain] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @mountaindatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @mountaindatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -6 else -7 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @mountaindatetime is null 
       select @mountaindatetime= dateadd(hour, -6, @interimdatetime)
return @mountaindatetime    
end

Hawaii

create function [dbo].[UnixTimeToHawaii] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @hawaiidatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @hawaiidatetime =  dateadd(hour,-10,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)

return @hawaiidatetime    
end

Arizona

create function [dbo].[UnixTimeToArizona] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @arizonadatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @arizonadatetime =  dateadd(hour,-7,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)

return @arizonadatetime    
end

Alaska

create function [dbo].[UnixTimeToAlaska] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @alaskadatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @alaskadatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -8 else -9 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @alaskadatetime is null 
       select @alaskadatetime= dateadd(hour, -8, @interimdatetime)
return @alaskadatetime    
end

How do you access the element HTML from within an Angular attribute directive?

Base on @Mark answer, I add the constructor to directive and it work with me.

I share a sample to whom concern.

constructor(private el: ElementRef, private renderer: Renderer) {
}

TS file

@Directive({ selector: '[accordion]' })
export class AccordionDirective {

  constructor(private el: ElementRef, private renderer: Renderer) {
  }

  @HostListener('click', ['$event']) onClick($event) {
    console.info($event);

    this.el.nativeElement.classList.toggle('is-open');

    var content = this.el.nativeElement.nextElementSibling;
    if (content.style.maxHeight) {
      // accordion is currently open, so close it
      content.style.maxHeight = null;
    } else {
      // accordion is currently closed, so open it
      content.style.maxHeight = content.scrollHeight + "px";

    }
  }
}

HTML

<button accordion class="accordion">Accordian #1</button>
    <div class="accordion-content">
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo,
        ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
      </p>     
    </div>

Demo https://stackblitz.com/edit/angular-directive-accordion?file=src/app/app.component.ts

Returning http status code from Web Api controller

If you need to return an IHttpActionResult and want to return the error code plus a message, use:

return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.NotModified, "Error message here"));

UTF-8 problems while reading CSV file with fgetcsv

Try this:

<?php
$handle = fopen ("specialchars.csv","r");
echo '<table border="1"><tr><td>First name</td><td>Last name</td></tr><tr>';
while ($data = fgetcsv ($handle, 1000, ";")) {
        $data = array_map("utf8_encode", $data); //added
        $num = count ($data);
        for ($c=0; $c < $num; $c++) {
            // output data
            echo "<td>$data[$c]</td>";
        }
        echo "</tr><tr>";
}
?>

AngularJS: how to enable $locationProvider.html5Mode with deeplinking

This was the best solution I found after more time than I care to admit. Basically, add target="_self" to each link that you need to insure a page reload.

http://blog.panjiesw.com/posts/2013/09/angularjs-normal-links-with-html5mode/

Overlaying histograms with ggplot2 in R

While only a few lines are required to plot multiple/overlapping histograms in ggplot2, the results are't always satisfactory. There needs to be proper use of borders and coloring to ensure the eye can differentiate between histograms.

The following functions balance border colors, opacities, and superimposed density plots to enable the viewer to differentiate among distributions.

Single histogram:

plot_histogram <- function(df, feature) {
    plt <- ggplot(df, aes(x=eval(parse(text=feature)))) +
    geom_histogram(aes(y = ..density..), alpha=0.7, fill="#33AADE", color="black") +
    geom_density(alpha=0.3, fill="red") +
    geom_vline(aes(xintercept=mean(eval(parse(text=feature)))), color="black", linetype="dashed", size=1) +
    labs(x=feature, y = "Density")
    print(plt)
}

Multiple histogram:

plot_multi_histogram <- function(df, feature, label_column) {
    plt <- ggplot(df, aes(x=eval(parse(text=feature)), fill=eval(parse(text=label_column)))) +
    geom_histogram(alpha=0.7, position="identity", aes(y = ..density..), color="black") +
    geom_density(alpha=0.7) +
    geom_vline(aes(xintercept=mean(eval(parse(text=feature)))), color="black", linetype="dashed", size=1) +
    labs(x=feature, y = "Density")
    plt + guides(fill=guide_legend(title=label_column))
}

Usage:

Simply pass your data frame into the above functions along with desired arguments:

plot_histogram(iris, 'Sepal.Width')

enter image description here

plot_multi_histogram(iris, 'Sepal.Width', 'Species')

enter image description here

The extra parameter in plot_multi_histogram is the name of the column containing the category labels.

We can see this more dramatically by creating a dataframe with many different distribution means:

a <-data.frame(n=rnorm(1000, mean = 1), category=rep('A', 1000))
b <-data.frame(n=rnorm(1000, mean = 2), category=rep('B', 1000))
c <-data.frame(n=rnorm(1000, mean = 3), category=rep('C', 1000))
d <-data.frame(n=rnorm(1000, mean = 4), category=rep('D', 1000))
e <-data.frame(n=rnorm(1000, mean = 5), category=rep('E', 1000))
f <-data.frame(n=rnorm(1000, mean = 6), category=rep('F', 1000))
many_distros <- do.call('rbind', list(a,b,c,d,e,f))

Passing data frame in as before (and widening chart using options):

options(repr.plot.width = 20, repr.plot.height = 8)
plot_multi_histogram(many_distros, 'n', 'category')

enter image description here

IE Enable/Disable Proxy Settings via Registry

modifying the proxy value under

[HKEY_USERS\<your SID>\Software\Microsoft\Windows\CurrentVersion\Internet Settings]

doesnt need to restart ie

iOS 7's blurred overlay effect using CSS?

made a quick demo yesterday that actually does what your talking about. http://bit.ly/10clOM9 this demo does the parallax based on the accelerometer so it works best on an iPhone itself. I basically just copy the content we are overlaying into a fixed position element that gets blurred.

note: swipe up to see the panel.

(i used horrible css id's but you get the idea)

#frost{
 position: fixed; 
 bottom: 0; 
 left:0; 
 width: 100%; 
 height: 100px; 
 overflow: hidden;
 -webkit-transition: all .5s;
}
#background2{
 -webkit-filter: blur(15px) brightness(.2);
}

#content2fixed{
 position: fixed;
 bottom: 9px;
 left: 9px;
 -webkit-filter: blur(10px);
}

CSS: Background image and padding

You can achieve your results with two methods:-

First Method define position values:-

HTML

 <ul>
 <li>Hello</li>
 <li>Hello world</li>
 </ul>

CSS

    ul{
    width:100px;    
}

ul li{
    border:1px solid orange;
    background: url("http://www.adaweb.net/Portals/0/Images/arrow1.gif") no-repeat 90% 5px;
}


ul li:hover{
    background: yellow url("http://www.adaweb.net/Portals/0/Images/arrow1.gif") no-repeat 90% 5px;
}

First Demo:- http://jsfiddle.net/QeGAd/18/

Second Method by CSS :before:after Selectors

HTML

<ul>
<li>Hello</li>
<li>Hello world</li>

CSS

    ul{
    width:100px;    
}

ul li{
    border:1px solid orange;
}

ul li:after {
    content: " ";
    padding-right: 16px;
    background: url("http://www.adaweb.net/Portals/0/Images/arrow1.gif") no-repeat center right;
}

ul li:hover {
    background:yellow;
}

ul li:hover:after {
    content: " ";
    padding-right: 16px;
    background: url("http://www.adaweb.net/Portals/0/Images/arrow1.gif") no-repeat center right;
}

Second Demo:- http://jsfiddle.net/QeGAd/17/

How to find all occurrences of a substring?

Come, let us recurse together.

def locations_of_substring(string, substring):
    """Return a list of locations of a substring."""

    substring_length = len(substring)    
    def recurse(locations_found, start):
        location = string.find(substring, start)
        if location != -1:
            return recurse(locations_found + [location], location+substring_length)
        else:
            return locations_found

    return recurse([], 0)

print(locations_of_substring('this is a test for finding this and this', 'this'))
# prints [0, 27, 36]

No need for regular expressions this way.

Python WindowsError: [Error 123] The filename, directory name, or volume label syntax is incorrect:

This is kind of an old question but I wanted to mentioned here the pathlib library in Python3.

If you write:

from pathlib import Path
path: str = 'C:\\Users\\myUserName\\project\\subfolder'
osDir = Path(path)

or

path: str = "C:\\Users\\myUserName\\project\\subfolder"
osDir = Path(path)

osDir will be the same result.

Also if you write it as:

path: str = "subfolder"
osDir = Path(path)
absolutePath: str = str(Path.absolute(osDir))

you will get back the absolute directory as

'C:\\Users\\myUserName\\project\\subfolder'

You can check more for the pathlib library here.

How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?

The fastest MySQL solution, without inner queries and without GROUP BY:

SELECT m.*                    -- get the row that contains the max value
FROM topten m                 -- "m" from "max"
    LEFT JOIN topten b        -- "b" from "bigger"
        ON m.home = b.home    -- match "max" row with "bigger" row by `home`
        AND m.datetime < b.datetime           -- want "bigger" than "max"
WHERE b.datetime IS NULL      -- keep only if there is no bigger than max

Explanation:

Join the table with itself using the home column. The use of LEFT JOIN ensures all the rows from table m appear in the result set. Those that don't have a match in table b will have NULLs for the columns of b.

The other condition on the JOIN asks to match only the rows from b that have bigger value on the datetime column than the row from m.

Using the data posted in the question, the LEFT JOIN will produce this pairs:

+------------------------------------------+--------------------------------+
|              the row from `m`            |    the matching row from `b`   |
|------------------------------------------|--------------------------------|
| id  home  datetime     player   resource | id    home   datetime      ... |
|----|-----|------------|--------|---------|------|------|------------|-----|
| 1  | 10  | 04/03/2009 | john   | 399     | NULL | NULL | NULL       | ... | *
| 2  | 11  | 04/03/2009 | juliet | 244     | NULL | NULL | NULL       | ... | *
| 5  | 12  | 04/03/2009 | borat  | 555     | NULL | NULL | NULL       | ... | *
| 3  | 10  | 03/03/2009 | john   | 300     | 1    | 10   | 04/03/2009 | ... |
| 4  | 11  | 03/03/2009 | juliet | 200     | 2    | 11   | 04/03/2009 | ... |
| 6  | 12  | 03/03/2009 | borat  | 500     | 5    | 12   | 04/03/2009 | ... |
| 7  | 13  | 24/12/2008 | borat  | 600     | 8    | 13   | 01/01/2009 | ... |
| 8  | 13  | 01/01/2009 | borat  | 700     | NULL | NULL | NULL       | ... | *
+------------------------------------------+--------------------------------+

Finally, the WHERE clause keeps only the pairs that have NULLs in the columns of b (they are marked with * in the table above); this means, due to the second condition from the JOIN clause, the row selected from m has the biggest value in column datetime.

Read the SQL Antipatterns: Avoiding the Pitfalls of Database Programming book for other SQL tips.

Get the cartesian product of a series of lists?

For Python 2.5 and older:

>>> [(a, b, c) for a in [1,2,3] for b in ['a','b'] for c in [4,5]]
[(1, 'a', 4), (1, 'a', 5), (1, 'b', 4), (1, 'b', 5), (2, 'a', 4), 
 (2, 'a', 5), (2, 'b', 4), (2, 'b', 5), (3, 'a', 4), (3, 'a', 5), 
 (3, 'b', 4), (3, 'b', 5)]

Here's a recursive version of product() (just an illustration):

def product(*args):
    if not args:
        return iter(((),)) # yield tuple()
    return (items + (item,) 
            for items in product(*args[:-1]) for item in args[-1])

Example:

>>> list(product([1,2,3], ['a','b'], [4,5])) 
[(1, 'a', 4), (1, 'a', 5), (1, 'b', 4), (1, 'b', 5), (2, 'a', 4), 
 (2, 'a', 5), (2, 'b', 4), (2, 'b', 5), (3, 'a', 4), (3, 'a', 5), 
 (3, 'b', 4), (3, 'b', 5)]
>>> list(product([1,2,3]))
[(1,), (2,), (3,)]
>>> list(product([]))
[]
>>> list(product())
[()]

How to format DateTime to 24 hours time?

Use upper-case HH for 24h format:

String s = curr.ToString("HH:mm");

See DateTime.ToString Method.

Set width of dropdown element in HTML select dropdown options

Small And Best One

#test{
width: 202px;
}
<select id="test" size="1" name="mrraja">

Saving Excel workbook to constant path with filename from two fields

Ok, at that time got it done with the help of a friend and the code looks like this.

Sub Saving()

Dim part1 As String

Dim part2 As String


part1 = Range("C5").Value

part2 = Range("C8").Value


ActiveWorkbook.SaveAs Filename:= _

"C:\-docs\cmat\Desktop\pieteikumi\" & part1 & " " & part2 & ".xlsm", FileFormat:= _
xlOpenXMLWorkbookMacroEnabled, CreateBackup:=False

End Sub

How do I edit this part (FileFormat:= _ xlOpenXMLWorkbookMacroEnabled) for it to save as Excel 97-2013 Workbook, have tried several variations with no success. Thankyou

Seems, that I found the solution, but my idea is flawed. By doing this FileFormat:= _ xlOpenXMLWorkbook, it drops out a popup saying, the you cannot save this workbook as a file without Macro enabled. So, is this impossible?

How to update gradle in android studio?

Step 1 (Use default gradle wrapper)

File?Settings?Build, Execution, Deployment?Build Tools?Gradle?Use default Gradle wrapper (recommended)

Android studio settings Gradle wrapper

Step 2 (Select desired gradle version)

File?Project Structure?Project

Android Studio project structure

The following table shows compatibility between Android plugin for Gradle and Gradle:

Compatibility table

Latest stable versions you can use with Android Studio 4.1.1 (November 2020):

Android Gradle Plugin version: 4.1.1
Gradle version: 6.5

Official links

How do I build a graphical user interface in C++?

Essentially, an operating system's windowing system exposes some API calls that you can perform to do jobs like create a window, or put a button on the window. Basically, you get a suite of header files and you can call functions in those imported libraries, just like you'd do with stdlib and printf.

Each operating system comes with its own GUI toolkit, suite of header files, and API calls, and their own way of doing things. There are also cross platform toolkits like GTK, Qt, and wxWidgets that help you build programs that work anywhere. They achieve this by having the same API calls on each platform, but a different implementation for those API functions that call down to the native OS API calls.

One thing they'll all have in common, which will be different from a CLI program, is something called an event loop. The basic idea there is somewhat complicated, and difficult to compress, but in essence it means that not a hell of a lot is going in in your main class/main function, except:

  • check the event queue if there's any new events
  • if there is, dispatch those events to appropriate handlers
  • when you're done, yield control back to the operating system (usually with some kind of special "sleep" or "select" or "yield" function call)
  • then the yield function will return when the operating system is done, and you have another go around the loop.

There are plenty of resources about event based programming. If you have any experience with JavaScript, it's the same basic idea, except that you, the scripter have no access or control over the event loop itself, or what events there are, your only job is to write and register handlers.

You should keep in mind that GUI programming is incredibly complicated and difficult, in general. If you have the option, it's actually much easier to just integrate an embedded webserver into your program and have an HTML/web based interface. The one exception that I've encountered is Apple's Cocoa+Xcode +interface builder + tutorials that make it easily the most approachable environment for people new to GUI programming that I've seen.

Getting list of Facebook friends with latest API

header('Content-type: text/html; charset=utf-8');

input in your page.

How to change Git log date formats

The others are (from git help log):

--date=(relative|local|default|iso|rfc|short|raw)
  Only takes effect for dates shown in human-readable format,
  such as when using "--pretty".  log.date config variable
  sets a default value for log command’s --date option.

--date=relative shows dates relative to the current time, e.g. "2 hours ago".

--date=local shows timestamps in user’s local timezone.

--date=iso (or --date=iso8601) shows timestamps in ISO 8601 format.

--date=rfc (or --date=rfc2822) shows timestamps in RFC 2822 format,
  often found in E-mail messages.

--date=short shows only date but not time, in YYYY-MM-DD format.

--date=raw shows the date in the internal raw git format %s %z format.

--date=default shows timestamps in the original timezone
  (either committer’s or author’s).

There is no built-in way that I know of to create a custom format, but you can do some shell magic.

timestamp=`git log -n1 --format="%at"`
my_date=`perl -e "print scalar localtime ($timestamp)"`
git log -n1 --pretty=format:"Blah-blah $my_date"

The first step here gets you a millisecond timestamp. You can change the second line to format that timestamp however you want. This example gives you something similar to --date=local, with a padded day.


And if you want permanent effect without typing this every time, try

git config log.date iso 

Or, for effect on all your git usage with this account

git config --global log.date iso

How do I turn off Unicode in a VC++ project?

project properities -> configuration properities -> general -> charater set

How to generate and manually insert a uniqueidentifier in sql server?

ApplicationId must be of type UniqueIdentifier. Your code works fine if you do:

DECLARE @TTEST TABLE
(
  TEST UNIQUEIDENTIFIER
)

DECLARE @UNIQUEX UNIQUEIDENTIFIER
SET @UNIQUEX = NEWID();

INSERT INTO @TTEST
(TEST)
VALUES
(@UNIQUEX);

SELECT * FROM @TTEST

Therefore I would say it is safe to assume that ApplicationId is not the correct data type.

What does "Content-type: application/json; charset=utf-8" really mean?

I exactly agree with @deceze but I want to develop this "I get an error from the service" part of the question,

We getting this kind of errors as http 415

Http 415 Unsupported Media type error

The HTTP 415 Unsupported Media Type client error response code indicates that the server refuses to accept the request because the payload format is in an unsupported format.

The format problem might be due to the request's indicated Content-Type or Content-Encoding, or as a result of inspecting the data directly.

In other words, such is seen in this example.

  • We have to set the correct content type and we have to accept the right content type as seen Add Content-Type: application/json and Accept: application/json. Otherwise, it will assume the default

Android Studio - Unable to find valid certification path to requested target

For me the issue was android studio was not able to establish connection with 'https://jcenter.bintray.com/'

Changing this to 'http' fixed the issue for me (Though this is not recommended).

In your build.gradle file, change

repositories {
   jcenter()
}

to

repositories {
   maven { url "http://jcenter.bintray.com"}
}

Set specific precision of a BigDecimal

The title of the question asks about precision. BigDecimal distinguishes between scale and precision. Scale is the number of decimal places. You can think of precision as the number of significant figures, also known as significant digits.

Some examples in Clojure.

(.scale     0.00123M) ; 5
(.precision 0.00123M) ; 3

(In Clojure, The M designates a BigDecimal literal. You can translate the Clojure to Java if you like, but I find it to be more compact than Java!)

You can easily increase the scale:

(.setScale 0.00123M 7) ; 0.0012300M

But you can't decrease the scale in the exact same way:

(.setScale 0.00123M 3) ; ArithmeticException Rounding necessary

You'll need to pass a rounding mode too:

(.setScale 0.00123M 3 BigDecimal/ROUND_HALF_EVEN) ;
; Note: BigDecimal would prefer that you use the MathContext rounding
; constants, but I don't have them at my fingertips right now.

So, it is easy to change the scale. But what about precision? This is not as easy as you might hope!

It is easy to decrease the precision:

(.round 3.14159M (java.math.MathContext. 3)) ; 3.14M

But it is not obvious how to increase the precision:

(.round 3.14159M (java.math.MathContext. 7)) ; 3.14159M (unexpected)

For the skeptical, this is not just a matter of trailing zeros not being displayed:

(.precision (.round 3.14159M (java.math.MathContext. 7))) ; 6 
; (same as above, still unexpected)

FWIW, Clojure is careful with trailing zeros and will show them:

4.0000M ; 4.0000M
(.precision 4.0000M) ; 5

Back on track... You can try using a BigDecimal constructor, but it does not set the precision any higher than the number of digits you specify:

(BigDecimal. "3" (java.math.MathContext. 5)) ; 3M
(BigDecimal. "3.1" (java.math.MathContext. 5)) ; 3.1M

So, there is no quick way to change the precision. I've spent time fighting this while writing up this question and with a project I'm working on. I consider this, at best, A CRAZYTOWN API, and at worst a bug. People. Seriously?

So, best I can tell, if you want to change precision, you'll need to do these steps:

  1. Lookup the current precision.
  2. Lookup the current scale.
  3. Calculate the scale change.
  4. Set the new scale

These steps, as Clojure code:

(def x 0.000691M) ; the input number
(def p' 1) ; desired precision
(def s' (+ (.scale x) p' (- (.precision x)))) ; desired new scale
(.setScale x s' BigDecimal/ROUND_HALF_EVEN)
; 0.0007M

I know, this is a lot of steps just to change the precision!

Why doesn't BigDecimal already provide this? Did I overlook something?

How to synchronize a static variable among threads running different instances of a class in Java?

If you're simply sharing a counter, consider using an AtomicInteger or another suitable class from the java.util.concurrent.atomic package:

public class Test {

    private final static AtomicInteger count = new AtomicInteger(0); 

    public void foo() {  
        count.incrementAndGet();
    }  
}

C#: what is the easiest way to subtract time?

These can all be done with DateTime.Add(TimeSpan) since it supports positive and negative timespans.

DateTime original = new DateTime(year, month, day, 8, 0, 0);
DateTime updated = original.Add(new TimeSpan(5,0,0));

DateTime original = new DateTime(year, month, day, 17, 0, 0);
DateTime updated = original.Add(new TimeSpan(-2,0,0));

DateTime original = new DateTime(year, month, day, 17, 30, 0);
DateTime updated = original.Add(new TimeSpan(0,45,0));

Or you can also use the DateTime.Subtract(TimeSpan) method analogously.

Android activity life cycle - what are all these methods for?

From the Android Developers page,

onPause():

Called when the system is about to start resuming a previous activity. This is typically used to commit unsaved changes to persistent data, stop animations and other things that may be consuming CPU, etc. Implementations of this method must be very quick because the next activity will not be resumed until this method returns. Followed by either onResume() if the activity returns back to the front, or onStop() if it becomes invisible to the user.

onStop():

Called when the activity is no longer visible to the user, because another activity has been resumed and is covering this one. This may happen either because a new activity is being started, an existing one is being brought in front of this one, or this one is being destroyed. Followed by either onRestart() if this activity is coming back to interact with the user, or onDestroy() if this activity is going away.

Now suppose there are three Activities and you go from A to B, then onPause of A will be called now from B to C, then onPause of B and onStop of A will be called.

The paused Activity gets a Resume and Stopped gets Restarted.

When you call this.finish(), onPause-onStop-onDestroy will be called. The main thing to remember is: paused Activities get Stopped and a Stopped activity gets Destroyed whenever Android requires memory for other operations.

I hope it's clear enough.

In Python, how do I index a list with another list?

L= {'a':'a','d':'d', 'h':'h'}
index= ['a','d','h'] 
for keys in index:
    print(L[keys])

I would use a Dict add desired keys to index

Changing Jenkins build number

By using environmental variables:

$BUILD_NUMBER =4

Rails: Adding an index after adding column

You can run another migration, just for the index:

class AddIndexToTable < ActiveRecord::Migration
  def change
    add_index :table, :user_id
  end
end

How to get base url in CodeIgniter 2.*

You need to load the URL Helper in order to use base_url(). In your controller, do:

$this->load->helper('url');

Then in your view you can do:

echo base_url();

Auto populate columns in one sheet from another sheet

In Google Sheets you can use =ArrayFormula(Sheet1!B2:B)on the first cell and it will populate all column contents not sure if that will work in excel

Error: [ng:areq] from angular controller

I ran into this issue when I had defined the module in the Angular controller but neglected to set the app name in my HTML file. For example:

<html ng-app>

instead of the correct:

<html ng-app="myApp">

when I had defined something like:

angular.module('myApp', []).controller(...

and referenced it in my HTML file.

Rounded corners for <input type='text' /> using border-radius.htc for IE

Oh lord, don't do it this way. HTC files are never a good idea for performance and clarity reasons, and you're using too many vendor-specific parameters for something that can easily be done cross-browser all the way back to IE6.

Apply a background image to your input field with the rounded corners and make the field's background colour transparent with border:none applied instead.

How to split elements of a list?

Try iterating through each element of the list, then splitting it at the tab character and adding it to a new list.

for i in list:
    newList.append(i.split('\t')[0])

VBA code to show Message Box popup if the formula in the target cell exceeds a certain value

Essentially you want to add code to the Calculate event of the relevant Worksheet.

In the Project window of the VBA editor, double-click the sheet you want to add code to and from the drop-downs at the top of the editor window, choose 'Worksheet' and 'Calculate' on the left and right respectively.

Alternatively, copy the code below into the editor of the sheet you want to use:

Private Sub Worksheet_Calculate()

If Sheets("MySheet").Range("A1").Value > 0.5 Then
    MsgBox "Over 50%!", vbOKOnly
End If

End Sub

This way, every time the worksheet recalculates it will check to see if the value is > 0.5 or 50%.

How to get a list of column names

$<?
$db = sqlite_open('mysqlitedb');
$cols = sqlite_fetch_column_types('form name'$db, SQLITE_ASSOC);
foreach ($cols as $column => $type) {
  echo "Column: $column  Type: $type\n";
}

How to use a WSDL file to create a WCF service (not make a call)

Using svcutil, you can create interfaces and classes (data contracts) from the WSDL.

svcutil your.wsdl (or svcutil your.wsdl /l:vb if you want Visual Basic)

This will create a file called "your.cs" in C# (or "your.vb" in VB.NET) which contains all the necessary items.

Now, you need to create a class "MyService" which will implement the service interface (IServiceInterface) - or the several service interfaces - and this is your server instance.

Now a class by itself doesn't really help yet - you'll need to host the service somewhere. You need to either create your own ServiceHost instance which hosts the service, configure endpoints and so forth - or you can host your service inside IIS.

Limit Get-ChildItem recursion depth

As of powershell 5.0, you can now use the -Depth parameter in Get-ChildItem!

You combine it with -Recurse to limit the recursion.

Get-ChildItem -Recurse -Depth 2

commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated

<ui:composition>  
  <h:form id="form1">
    <p:dialog id="dialog1">
      <p:commandButton value="Save" action="#{bean.method1}" /> <!--Working-->
    </p:dialog>
  </h:form>

  <h:form id="form2">
    <p:dialog id="dialog2">
      <p:commandButton value="Save" action="#{bean.method2}" /> <!--Not Working-->
    </p:dialog>
  </h:form>
</ui:composition>

To solve;

<ui:composition>  
  <h:form id="form1">
    <p:dialog id="dialog1">
      <p:commandButton value="Save" action="#{bean.method1}" />   <!-- Working  -->
    </p:dialog>

    <p:dialog id="dialog2">
      <p:commandButton value="Save" action="#{bean.method2}" />   <!--Working  -->
    </p:dialog>
  </h:form>
  <h:form id="form2">
    <!-- ..........  -->
  </h:form>
</ui:composition>

Windows 10 SSH keys

  1. Open the windows command line (type "cmd" on the search box and hit enter).
  2. It'll default to your home folder, so you don't need to cd to a different one.
  3. Type mkdir .ssh

React Native: Getting the position of an element

I needed to find the position of an element inside a ListView and used this snippet that works kind of like .offset:

const UIManager = require('NativeModules').UIManager;
const handle = React.findNodeHandle(this.refs.myElement);
UIManager.measureLayoutRelativeToParent(
  handle, 
  (e) => {console.error(e)}, 
  (x, y, w, h) => {
    console.log('offset', x, y, w, h);
  });

This assumes I had a ref='myElement' on my component.

Get input value from TextField in iOS alert in Swift

In Swift5 ans Xcode 10

Add two textfields with Save and Cancel actions and read TextFields text data

func alertWithTF() {
    //Step : 1
    let alert = UIAlertController(title: "Great Title", message: "Please input something", preferredStyle: UIAlertController.Style.alert )
    //Step : 2
    let save = UIAlertAction(title: "Save", style: .default) { (alertAction) in
        let textField = alert.textFields![0] as UITextField
        let textField2 = alert.textFields![1] as UITextField
        if textField.text != "" {
            //Read TextFields text data
            print(textField.text!)
            print("TF 1 : \(textField.text!)")
        } else {
            print("TF 1 is Empty...")
        }

        if textField2.text != "" {
            print(textField2.text!)
            print("TF 2 : \(textField2.text!)")
        } else {
            print("TF 2 is Empty...")
        }
    }

    //Step : 3
    //For first TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your first name"
        textField.textColor = .red
    }
    //For second TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your last name"
        textField.textColor = .blue
    }

    //Step : 4
    alert.addAction(save)
    //Cancel action
    let cancel = UIAlertAction(title: "Cancel", style: .default) { (alertAction) in }
    alert.addAction(cancel)
    //OR single line action
    //alert.addAction(UIAlertAction(title: "Cancel", style: .default) { (alertAction) in })

    self.present(alert, animated:true, completion: nil)

}

For more explanation https://medium.com/@chan.henryk/alert-controller-with-text-field-in-swift-3-bda7ac06026c

How to create an integer array in Python?

import numpy as np

new_array=np.linspace(0,10,11).astype('int')

An alternative for casting the type when the array is made.

DBNull if statement

Yes, just a syntax problem. Try this instead:

if (reader["usr.ursrdaystime"] != DBNull.Value)

.Equals() is checking to see if two Object instances are the same.

What are the git concepts of HEAD, master, origin?

I highly recommend the book "Pro Git" by Scott Chacon. Take time and really read it, while exploring an actual git repo as you do.

HEAD: the current commit your repo is on. Most of the time HEAD points to the latest commit in your current branch, but that doesn't have to be the case. HEAD really just means "what is my repo currently pointing at".

In the event that the commit HEAD refers to is not the tip of any branch, this is called a "detached head".

master: the name of the default branch that git creates for you when first creating a repo. In most cases, "master" means "the main branch". Most shops have everyone pushing to master, and master is considered the definitive view of the repo. But it's also common for release branches to be made off of master for releasing. Your local repo has its own master branch, that almost always follows the master of a remote repo.

origin: the default name that git gives to your main remote repo. Your box has its own repo, and you most likely push out to some remote repo that you and all your coworkers push to. That remote repo is almost always called origin, but it doesn't have to be.

HEAD is an official notion in git. HEAD always has a well-defined meaning. master and origin are common names usually used in git, but they don't have to be.

mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource

$result = mysql_query('SELECT * FROM Users WHERE UserName LIKE $username');

You define the string using single quotes and PHP does not parse single quote delimited strings. In order to obtain variable interpolation you will need to use double quotes OR string concatenation (or a combination there of). See http://php.net/manual/en/language.types.string.php for more information.

Also you should check that mysql_query returned a valid result resource, otherwise fetch_*, num_rows, etc will not work on the result as is not a result! IE:

$username = $_POST['username'];
$password = $_POST['password'];
$result = mysql_query('SELECT * FROM Users WHERE UserName LIKE $username');

if( $result === FALSE ) {
   trigger_error('Query failed returning error: '. mysql_error(),E_USER_ERROR);
} else {
   while( $row = mysql_fetch_array($result) ) {
      echo $row['username'];
   }
}

http://us.php.net/manual/en/function.mysql-query.php for more information.

Should I put input elements inside a label element?

If you include the input tag in the label tag, you don't need to use the 'for' attribute.

That said, I don't like to include the input tag in my labels because I think they're separate, not containing, entities.

Setting a PHP $_SESSION['var'] using jQuery

Similar to Luke's answer, but with GET.

Place this php-code in a php-page, ex. getpage.php:

<?php
$_SESSION['size'] = $_GET['size'];
?>

Then call it with a jQuery script like this:

$.get( "/getpage.php?size=1");

Agree with Federico. In some cases you may run into problems using POST, although not sure if it can be browser related.

Selecting Values from Oracle Table Variable / Array?

You might need a GLOBAL TEMPORARY TABLE.

In Oracle these are created once and then when invoked the data is private to your session.

Oracle Documentation Link

Try something like this...

CREATE GLOBAL TEMPORARY TABLE temp_number
   ( number_column   NUMBER( 10, 0 )
   )
   ON COMMIT DELETE ROWS;

BEGIN 
   INSERT INTO temp_number
      ( number_column )
      ( select distinct sgbstdn_pidm 
          from sgbstdn 
         where sgbstdn_majr_code_1 = 'HS04' 
           and sgbstdn_program_1 = 'HSCOMPH' 
      ); 

    FOR pidms_rec IN ( SELECT number_column FROM temp_number )
    LOOP 
        -- Do something here
        NULL; 
    END LOOP; 
END; 
/

How to get a Char from an ASCII Character Code in c#

It is important to notice that in C# the char type is stored as Unicode UTF-16.

From ASCII equivalent integer to char

char c = (char)88;

or

char c = Convert.ToChar(88)

From char to ASCII equivalent integer

int asciiCode = (int)'A';

The literal must be ASCII equivalent. For example:

string str = "X?????????";
Console.WriteLine((int)str[0]);
Console.WriteLine((int)str[1]);

will print

X
3626

Extended ASCII ranges from 0 to 255.

From default UTF-16 literal to char

Using the Symbol

char c = 'X';

Using the Unicode code

char c = '\u0058';

Using the Hexadecimal

char c = '\x0058';

Equivalent of LIMIT and OFFSET for SQL Server?

The closest I could make is

select * FROM( SELECT *, ROW_NUMBER() over (ORDER BY ID ) as ct from [db].[dbo].[table] ) sub where ct > fromNumber  and ct <= toNumber

Which I guess similar to select * from [db].[dbo].[table] LIMIT 0, 10

Coding Conventions - Naming Enums

Enums are classes and should follow the conventions for classes. Instances of an enum are constants and should follow the conventions for constants. So

enum Fruit {APPLE, ORANGE, BANANA, PEAR};

There is no reason for writing FruitEnum any more than FruitClass. You are just wasting four (or five) characters that add no information.

Java itself recommends this approach and it is used in their examples.

Waiting until two async blocks are executed before starting another block

Use dispatch groups: see here for an example, "Waiting on Groups of Queued Tasks" in the "Dispatch Queues" chapter of Apple's iOS Developer Library's Concurrency Programming Guide

Your example could look something like this:

dispatch_group_t group = dispatch_group_create();

dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
    // block1
    NSLog(@"Block1");
    [NSThread sleepForTimeInterval:5.0];
    NSLog(@"Block1 End");
});


dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
    // block2
    NSLog(@"Block2");
    [NSThread sleepForTimeInterval:8.0];
    NSLog(@"Block2 End");
});

dispatch_group_notify(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
    // block3
    NSLog(@"Block3");
});

// only for non-ARC projects, handled automatically in ARC-enabled projects.
dispatch_release(group);

and could produce output like this:

2012-08-11 16:10:18.049 Dispatch[11858:1e03] Block1
2012-08-11 16:10:18.052 Dispatch[11858:1d03] Block2
2012-08-11 16:10:23.051 Dispatch[11858:1e03] Block1 End
2012-08-11 16:10:26.053 Dispatch[11858:1d03] Block2 End
2012-08-11 16:10:26.054 Dispatch[11858:1d03] Block3

How to get multiple selected values of select box in php?

Change:

<select name="select2" ...

To:

<select name="select2[]" ...

Passing array in GET for a REST call

I think it's a better practice to serialize your REST call parameters, usually by JSON-encoding them:

/appointments?users=[id1,id2]

or even:

/appointments?params={users:[id1,id2]}

Then you un-encode them on the server. This is going to give you more flexibility in the long run.

Just make sure to URLEncode the params as well before you send them!

Google Android USB Driver and ADB

  1. modify android_winusb.inf
  2. Sign the driver
  3. modify adb

I also instaled generic adb driver from http://adbdriver.com/ and it works.

What is the backslash character (\\)?

\ is used for escape sequences in programming languages.

\n prints a newline
\\ prints a backslash
\" prints "
\t prints a tabulator
\b moves the cursor one back

How to put multiple statements in one line?

maybe with "and" or "or"

after false need to write "or"

after true need to write "and"

like

n=0
def returnsfalse():
    global n
    n=n+1
    print ("false %d" % (n))
    return False
def returnstrue():
    global n
    n=n+1
    print ("true %d" % (n))
    return True
n=0
returnsfalse() or  returnsfalse() or returnsfalse() or returnstrue() and returnsfalse()

result:

false 1
false 2
false 3
true 4
false 5

or maybe like

(returnsfalse() or true) and (returnstrue() or true) and ...

got here by searching google "how to put multiple statments in one line python", not answers question directly, maybe somebody else needs this.

Sort a Custom Class List<T>

You can use linq:

var q = from tag in Week orderby Convert.ToDateTime(tag.date) select tag;
List<cTag> Sorted = q.ToList()

Remove HTML Tags from an NSString on the iPhone

Extending this more from m.kocikowski's and Dan J's answers with more explanation for newbies

1# First you have to create objective-c-categories to make the code useable in any class.

.h

@interface NSString (NAME_OF_CATEGORY)

- (NSString *)stringByStrippingHTML;

@end

.m

@implementation NSString (NAME_OF_CATEGORY)

- (NSString *)stringByStrippingHTML
{
NSMutableString *outString;
NSString *inputString = self;

if (inputString)
{
    outString = [[NSMutableString alloc] initWithString:inputString];

    if ([inputString length] > 0)
    {
        NSRange r;

        while ((r = [outString rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
        {
            [outString deleteCharactersInRange:r];
        }
    }
}

return outString;
}

@end

2# Then just import the .h file of the category class you've just created e.g.

#import "NSString+NAME_OF_CATEGORY.h"

3# Calling the Method.

NSString* sub = [result stringByStrippingHTML];
NSLog(@"%@", sub);

result is NSString I want to strip the tags from.

How do I combine two lists into a dictionary in Python?

If there are duplicate keys in the first list that map to different values in the second list, like a 1-to-many relationship, but you need the values to be combined or added or something instead of updating, you can do this:

i = iter(["a", "a", "b", "c", "b"])
j = iter([1,2,3,4,5])
k = list(zip(i, j))
for (x,y) in k:
    if x in d:
        d[x] = d[x] + y #or whatever your function needs to be to combine them
    else:
        d[x] = y

In that example, d == {'a': 3, 'c': 4, 'b': 8}

$apply already in progress error

You are getting this error because you are calling $apply inside an existing digestion cycle.

The big question is: why are you calling $apply? You shouldn't ever need to call $apply unless you are interfacing from a non-Angular event. The existence of $apply usually means I am doing something wrong (unless, again, the $apply happens from a non-Angular event).

If $apply really is appropriate here, consider using a "safe apply" approach:

https://coderwall.com/p/ngisma

Use find command but exclude files in two directories

You can try below:

find ./ ! \( -path ./tmp -prune \) ! \( -path ./scripts -prune \) -type f -name '*_peaks.bed'

EditText onClickListener in Android

Normally, you want maximum compatibility with EditText's normal behaviour.

So you should not use android:focusable="false" as, yes, the view will just not be focusable anymore which looks bad. The background drawable will not show its "pressed" state anymore, for example.

What you should do instead is the following:

myEditText.setInputType(InputType.TYPE_NULL);
myEditText.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // showMyDialog();
    }
});
myEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            // showMyDialog();
        }
    }
});

By setting the input type to TYPE_NULL, you prevent the software keyboard from popping up.

By setting the OnClickListener and OnFocusChangeListener, you make sure that your dialog will always open when the user clicks into the EditText field, both when it gains focus (first click) and on subsequent clicks.

Just setting android:inputType="none" or setInputType(InputType.TYPE_NULL) is not always enough. For some devices, you should set android:editable="false" in XML as well, although it is deprecated. If it does not work anymore, it will just be ignored (as all XML attributes that are not supported).

No plot window in matplotlib

Any errors show up? This might an issue of not having set the backend. You can set it from the Python interpreter or from a config file (.matplotlib/matplotlibrc) in you home directory.

To set the backend in code you can do

import matplotlib
matplotlib.use('Agg')

where 'Agg' is the name of the backend. Which backends are present depend on your installation and OS.

http://matplotlib.sourceforge.net/faq/installing_faq.html#backends

http://matplotlib.org/users/customizing.html

Renaming Column Names in Pandas Groupby function

The current (as of version 0.20) method for changing column names after a groupby operation is to chain the rename method. See this deprecation note in the documentation for more detail.

Deprecated Answer as of pandas version 0.20

This is the first result in google and although the top answer works it does not really answer the question. There is a better answer here and a long discussion on github about the full functionality of passing dictionaries to the agg method.

These answers unfortunately do not exist in the documentation but the general format for grouping, aggregating and then renaming columns uses a dictionary of dictionaries. The keys to the outer dictionary are column names that are to be aggregated. The inner dictionaries have keys that the new column names with values as the aggregating function.

Before we get there, let's create a four column DataFrame.

df = pd.DataFrame({'A' : list('wwwwxxxx'), 
                   'B':list('yyzzyyzz'), 
                   'C':np.random.rand(8), 
                   'D':np.random.rand(8)})

   A  B         C         D
0  w  y  0.643784  0.828486
1  w  y  0.308682  0.994078
2  w  z  0.518000  0.725663
3  w  z  0.486656  0.259547
4  x  y  0.089913  0.238452
5  x  y  0.688177  0.753107
6  x  z  0.955035  0.462677
7  x  z  0.892066  0.368850

Let's say we want to group by columns A, B and aggregate column C with mean and median and aggregate column D with max. The following code would do this.

df.groupby(['A', 'B']).agg({'C':['mean', 'median'], 'D':'max'})

            D         C          
          max      mean    median
A B                              
w y  0.994078  0.476233  0.476233
  z  0.725663  0.502328  0.502328
x y  0.753107  0.389045  0.389045
  z  0.462677  0.923551  0.923551

This returns a DataFrame with a hierarchical index. The original question asked about renaming the columns in the same step. This is possible using a dictionary of dictionaries:

df.groupby(['A', 'B']).agg({'C':{'C_mean': 'mean', 'C_median': 'median'}, 
                            'D':{'D_max': 'max'}})

            D         C          
        D_max    C_mean  C_median
A B                              
w y  0.994078  0.476233  0.476233
  z  0.725663  0.502328  0.502328
x y  0.753107  0.389045  0.389045
  z  0.462677  0.923551  0.923551

This renames the columns all in one go but still leaves the hierarchical index which the top level can be dropped with df.columns = df.columns.droplevel(0).

How to reference a local XML Schema file correctly?

If you work in MS Visual Studio just do following

  1. Put WSDL file and XSD file at the same folder.
  2. Correct WSDL file like this YourSchemeFile.xsd

  3. Use visual Studio using this great example How to generate service reference with only physical wsdl file

Notice that you have to put the path to your WSDL file manually. There is no way to use Open File dialog box out there.

Purpose of __repr__ method?

__repr__ is used by the standalone Python interpreter to display a class in printable format. Example:

~> python3.5
Python 3.5.1 (v3.5.1:37a07cee5969, Dec  5 2015, 21:12:44) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class StackOverflowDemo:
...     def __init__(self):
...         pass
...     def __repr__(self):
...         return '<StackOverflow demo object __repr__>'
... 
>>> demo = StackOverflowDemo()
>>> demo
<StackOverflow demo object __repr__>

In cases where a __str__ method is not defined in the class, it will call the __repr__ function in an attempt to create a printable representation.

>>> str(demo)
'<StackOverflow demo object __repr__>'

Additionally, print()ing the class will call __str__ by default.


Documentation, if you please

Get properties of a class

Another solution, You can just iterate over the object keys like so, Note: you must use an instantiated object with existing properties:

printTypeNames<T>(obj: T) {
    const objectKeys = Object.keys(obj) as Array<keyof T>;
    for (let key of objectKeys)
    {
       console.log('key:' + key);
    }
}

Validate form field only on submit or user input

You can use angularjs form state form.$submitted. Initially form.$submitted value will be false and will became true after successful form submit.

Get user's non-truncated Active Directory groups from command line

A little stale post, but I figured what the heck. Does "whoami" meet your needs?

I just found out about it today (from the same Google search that brought me here, in fact). Windows has had a whoami tool since XP (part of an add on toolkit) and has been built-in since Vista.

whoami /groups

Lists all the AD groups for the currently logged-on user. I believe it does require you to be logged on AS that user, though, so this won't help if your use case requires the ability to run the command to look at another user.

Group names only:

whoami /groups /fo list |findstr /c:"Group Name:"

How do I deal with installing peer dependencies in Angular CLI?

Peer dependency warnings, more often than not, can be ignored. The only time you will want to take action is if the peer dependency is missing entirely, or if the version of a peer dependency is higher than the version you have installed.

Let's take this warning as an example:

npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.

With Angular, you would like the versions you are using to be consistent across all packages. If there are any incompatible versions, change the versions in your package.json, and run npm install so they are all synced up. I tend to keep my versions for Angular at the latest version, but you will need to make sure your versions are consistent for whatever version of Angular you require (which may not be the most recent).

In a situation like this:

npm WARN [email protected] requires a peer of @angular/core@^2.4.0 || ^4.0.0 but none is installed. You must install peer dependencies yourself.

If you are working with a version of Angular that is higher than 4.0.0, then you will likely have no issues. Nothing to do about this one then. If you are using an Angular version under 2.4.0, then you need to bring your version up. Update the package.json, and run npm install, or run npm install for the specific version you need. Like this:

npm install @angular/[email protected] --save

You can leave out the --save if you are running npm 5.0.0 or higher, that version saves the package in the dependencies section of the package.json automatically.

In this situation:

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

You are running Windows, and fsevent requires OSX. This warning can be ignored.

Hope this helps, and have fun learning Angular!

Generating 8-character only UUIDs

First: Even the unique IDs generated by java UUID.randomUUID or .net GUID are not 100% unique. Especialy UUID.randomUUID is "only" a 128 bit (secure) random value. So if you reduce it to 64 bit, 32 bit, 16 bit (or even 1 bit) then it becomes simply less unique.

So it is at least a risk based decisions, how long your uuid must be.

Second: I assume that when you talk about "only 8 characters" you mean a String of 8 normal printable characters.

If you want a unique string with length 8 printable characters you could use a base64 encoding. This means 6bit per char, so you get 48bit in total (possible not very unique - but maybe it is ok for you application)

So the way is simple: create a 6 byte random array

 SecureRandom rand;
 // ...
 byte[] randomBytes = new byte[16];
 rand.nextBytes(randomBytes);

And then transform it to a Base64 String, for example by org.apache.commons.codec.binary.Base64

BTW: it depends on your application if there is a better way to create "uuid" then by random. (If you create a the UUIDs only once per second, then it is a good idea to add a time stamp) (By the way: if you combine (xor) two random values, the result is always at least as random as the most random of the both).