What is monkey patching?

No, it's not like any of those things. It's simply the dynamic replacement of attributes at runtime.

For instance, consider a class that has a method get_data. This method does an external lookup (on a database or web API, for example), and various other methods in the class call it. However, in a unit test, you don't want to depend on the external data source - so you dynamically replace the get_data method with a stub that returns some fixed data.

Because Python classes are mutable, and methods are just attributes of the class, you can do this as much as you like - and, in fact, you can even replace classes and functions in a module in exactly the same way.

But, as a commenter pointed out, use caution when monkeypatching:

If anything else besides your test logic calls get_data as well, it will also call your monkey-patched replacement rather than the original -- which can be good or bad. Just beware.
If some variable or attribute exists that also points to the get_data function by the time you replace it, this alias will not change its meaning and will continue to point to the original get_data. (Why? Python just rebinds the name get_data in your class to some other function object; other name bindings are not impacted at all.)

Missing `server' JVM (Java\jre7\bin\server\jvm.dll.)

To Fix The "Missing "server" JVM at C:\Program Files\Java\jre7\bin\server\jvm.dll, please install or use the JRE or JDK that contains these missing components.

Follow these steps:

Go to oracle.com and install Java JRE7 (Check if Java 6 is not installed already)

After that, go to C:/Program files/java/jre7/bin

Here, create an folder called Server

Now go into the C:/Program files/java/jre7/bin/client folder

Copy all the data in this folder into the new C:/Program files/java/jre7/bin/Server folder

How can I get CMake to find my alternative Boost installation?

I just added the environment variable Boost_INCLUDE_DIR or add it to the cmake command -DBoost_INCLUDE_DIR and point to the include folder.

Set Label Text with JQuery

You can try:

<label id ="label_id"></label>
 $("#label_id").html('value');

What is the function of FormulaR1C1?

Here's some info from my blog on how I like to use formular1c1 outside of vba:

You’ve just finished writing a formula, copied it to the whole spreadsheet, formatted everything and you realize that you forgot to make a reference absolute: every formula needed to reference Cell B2 but now, they all reference different cells.

How are you going to do a Find/Replace on the cells, considering that one has B5, the other C12, the third D25, etc., etc.?

The easy way is to update your Reference Style to R1C1. The R1C1 reference works with relative positioning: R marks the Row, C the Column and the numbers that follow R and C are either relative positions (between [ ]) or absolute positions (no [ ]).

Examples:

R[2]C refers to the cell two rows below the cell in which the formula’s in
RC[-1] refers to the cell one column to the left
R1C1 refers the cell in the first row and first cell ($A$1)

What does it matter? Well, When you wrote your first formula back in the beginning of this post, B2 was the cell 4 rows above the cell you wrote it in, i.e. R[-4]C. When you copy it across and down, while the A1 reference changes, the R1C1 reference doesn’t. Throughout the whole spreadsheet, it’s R[-4]C. If you switch to R1C1 Reference Style, you can replace R[-4]C by R2C2 ($B$2) with a simple Find / Replace and be done in one fell swoop.

python numpy machine epsilon

Another easy way to get epsilon is:

In [1]: 7./3 - 4./3 -1
Out[1]: 2.220446049250313e-16

How can I create and style a div using JavaScript?

_x000D_

var div = document.createElement("div");_x000D_
div.style.width = "100px";_x000D_
div.style.height = "100px";_x000D_
div.style.background = "red";_x000D_
div.style.color = "white";_x000D_
div.innerHTML = "Hello";_x000D_
_x000D_
document.getElementById("main").appendChild(div);

_x000D_

<body>_x000D_
<div id="main"></div>_x000D_
</body>

_x000D_

var div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.background = "red";
div.style.color = "white";
div.innerHTML = "Hello";

document.getElementById("main").appendChild(div);
OR
document.body.appendChild(div);

Use parent reference instead of document.body.

How to completely uninstall Visual Studio 2010?

The only real clean way to uninstall VS (Visual Studio, whatever version it is) is to completely reinstall the whole OS. If you don't, more compatibility problems might surface.

Permanent solution

Starting from scratch (clean install, VS never installed on the OS), the best way to avoid all those problems is to install and run VS from a VM (virtual machine) as stated by Default in the comments above. This way, and as long as Microsoft doesn't do anything to improve its whole platform to be more user-friendly, switching from a version to another will be quick and easy and the main partition of the HDD (or SSD in my case) won't be filed with all the garbage that VS leaves behind.

Of course, the disadvantage is speed. The program will be slower in pretty much every way. But honestly, who uses VS for its speed? Even on the latest enthusiast-platforms, it takes ages to install. Even if VS might start up faster on a high-end SSD, it's just slow.

How can I create a copy of an Oracle table without copying the data?

Just use a where clause that won't select any rows:

create table xyz_new as select * from xyz where 1=0;

Limitations

The following things will not be copied to the new table:

sequences
triggers
indexes
some constraints may not be copied
materialized view logs

This also does not handle partitions

Set a variable if undefined in JavaScript

Logical nullish assignment, ES2020+ solution

New operators are currently being added to the browsers, ??=, ||=, and &&=. This post will focus on ??=.

This checks if left side is undefined or null, short-circuiting if already defined. If not, the right-side is assigned to the left-side variable.

Comparing Methods

// Using ??=
name ??= "Dave"

// Previously, ES2020
name = name ?? "Dave"

// Before that (not equivalent, but commonly used)
name = name || "Dave" // name ||= "Dave"

Basic Examples

let a       // undefined
let b = null
let c = false

a ??= true  // true
b ??= true  // true
c ??= true  // false

// Equivalent to
a = a ?? true

Object/Array Examples

let x = ["foo"]
let y = { foo: "fizz" }

x[0] ??= "bar"  // "foo"
x[1] ??= "bar"  // "bar"

y.foo ??= "buzz"  // "fizz"
y.bar ??= "buzz"  // "buzz"

x  // Array [ "foo", "bar" ]
y  // Object { foo: "fizz", bar: "buzz" }

??= Browser Support Jan 2021 - 81%

??= Mozilla Documentation

||= Mozilla Documentation

&&= Mozilla Documentation

How can I one hot encode in Python?

Much easier to use Pandas for basic one-hot encoding. If you're looking for more options you can use scikit-learn.

For basic one-hot encoding with Pandas you pass your data frame into the get_dummies function.

For example, if I have a dataframe called imdb_movies:

...and I want to one-hot encode the Rated column, I do this:

pd.get_dummies(imdb_movies.Rated)

This returns a new dataframe with a column for every "level" of rating that exists, along with either a 1 or 0 specifying the presence of that rating for a given observation.

Usually, we want this to be part of the original dataframe. In this case, we attach our new dummy coded frame onto the original frame using "column-binding.

We can column-bind by using Pandas concat function:

rated_dummies = pd.get_dummies(imdb_movies.Rated)
pd.concat([imdb_movies, rated_dummies], axis=1)

We can now run an analysis on our full dataframe.

SIMPLE UTILITY FUNCTION

I would recommend making yourself a utility function to do this quickly:

def encode_and_bind(original_dataframe, feature_to_encode):
    dummies = pd.get_dummies(original_dataframe[[feature_to_encode]])
    res = pd.concat([original_dataframe, dummies], axis=1)
    return(res)

Usage:

encode_and_bind(imdb_movies, 'Rated')

Result:

Also, as per @pmalbu comment, if you would like the function to remove the original feature_to_encode then use this version:

def encode_and_bind(original_dataframe, feature_to_encode):
    dummies = pd.get_dummies(original_dataframe[[feature_to_encode]])
    res = pd.concat([original_dataframe, dummies], axis=1)
    res = res.drop([feature_to_encode], axis=1)
    return(res)

You can encode multiple features at the same time as follows:

features_to_encode = ['feature_1', 'feature_2', 'feature_3',
                      'feature_4']
for feature in features_to_encode:
    res = encode_and_bind(train_set, feature)

Convert a tensor to numpy array in Tensorflow?

To convert back from tensor to numpy array you can simply run .eval() on the transformed tensor.

HTML Form: Select-Option vs Datalist-Option

Data List is a new HTML tag in HTML5 supported browsers. It renders as a text box with some list of options. For Example for Gender Text box it will give you options as Male Female when you type 'M' or 'F' in Text Box.

<input list="Gender">
<datalist id="Gender">
  <option value="Male">
  <option value="Female> 
</datalist>

anchor jumping by using javascript

I think it is much more simple solution:

window.location = (""+window.location).replace(/#[A-Za-z0-9_]*$/,'')+"#myAnchor"

This method does not reload the website, and sets the focus on the anchors which are needed for screen reader.

Parameter binding on left joins with array in Laravel Query Builder

You don't have to bind parameters if you use query builder or eloquent ORM. However, if you use DB::raw(), ensure that you binding the parameters.

Try the following:

$array = array(1,2,3);       $query = DB::table('offers');             $query->select('id', 'business_id', 'address_id', 'title', 'details', 'value', 'total_available', 'start_date', 'end_date', 'terms', 'type', 'coupon_code', 'is_barcode_available', 'is_exclusive', 'userinformations_id', 'is_used');             $query->leftJoin('user_offer_collection', function ($join) use ($array)             {                 $join->on('user_offer_collection.offers_id', '=', 'offers.id')                       ->whereIn('user_offer_collection.user_id', $array);             });       $query->get();

Java AES encryption and decryption

If for a block cipher you're not going to use a Cipher transformation that includes a padding scheme, you need to have the number of bytes in the plaintext be an integral multiple of the block size of the cipher.

So either pad out your plaintext to a multiple of 16 bytes (which is the AES block size), or specify a padding scheme when you create your Cipher objects. For example, you could use:

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

Unless you have a good reason not to, use a padding scheme that's already part of the JCE implementation. They've thought out a number of subtleties and corner cases you'll have to realize and deal with on your own otherwise.

Ok, your second problem is that you are using String to hold the ciphertext.

In general,

String s = new String(someBytes);
byte[] retrievedBytes = s.getBytes();

will not have someBytes and retrievedBytes being identical.

If you want/have to hold the ciphertext in a String, base64-encode the ciphertext bytes first and construct the String from the base64-encoded bytes. Then when you decrypt you'll getBytes() to get the base64-encoded bytes out of the String, then base64-decode them to get the real ciphertext, then decrypt that.

The reason for this problem is that most (all?) character encodings are not capable of mapping arbitrary bytes to valid characters. So when you create your String from the ciphertext, the String constructor (which applies a character encoding to turn the bytes into characters) essentially has to throw away some of the bytes because it can make no sense of them. Thus, when you get bytes out of the string, they are not the same bytes you put into the string.

In Java (and in modern programming in general), you cannot assume that one character = one byte, unless you know absolutely you're dealing with ASCII. This is why you need to use base64 (or something like it) if you want to build strings from arbitrary bytes.

JavaScript chop/slice/trim off last character in string

If you want to do generic rounding of floats, instead of just trimming the last character:

var float1 = 12345.00,
    float2 = 12345.4567,
    float3 = 12345.982;

var MoreMath = {
    /**
     * Rounds a value to the specified number of decimals
     * @param float value The value to be rounded
     * @param int nrDecimals The number of decimals to round value to
     * @return float value rounded to nrDecimals decimals
     */
    round: function (value, nrDecimals) {
        var x = nrDecimals > 0 ? 10 * parseInt(nrDecimals, 10) : 1;
        return Math.round(value * x) / x;
    }
}

MoreMath.round(float1, 1) => 12345.0
MoreMath.round(float2, 1) => 12345.5
MoreMath.round(float3, 1) => 12346.0

EDIT: Seems like there exists a built in function for this, as Paolo points out. That solution is obviously much cleaner than mine. Use parseFloat followed by toFixed

C# Help reading foreign characters using StreamReader

Using Encoding.Unicode won't accurately decode an ANSI file in the same way that a JPEG decoder won't understand a GIF file.

I'm surprised that Encoding.Default didn't work for the ANSI file if it really was ANSI - if you ever find out exactly which code page Notepad was using, you could use Encoding.GetEncoding(int).

In general, where possible I'd recommend using UTF-8.

Swift - Split string over multiple lines

Swift 4 includes support for multi-line string literals. In addition to newlines they can also contain unescaped quotes.

var text = """
    This is some text
    over multiple lines
    """

Older versions of Swift don't allow you to have a single literal over multiple lines but you can add literals together over multiple lines:

var text = "This is some text\n"
         + "over multiple lines\n"

How can I center text (horizontally and vertically) inside a div block?

This worked for me:

.center-stuff{
    text-align: center;
    vertical-align: middle;
    line-height: 230px; /* This should be the div height */
}

how to create a list of lists

Just came across the same issue today...

In order to create a list of lists you will have firstly to store your data, array, or other type of variable into a list. Then, create a new empty list and append to it the lists that you just created. At the end you should end up with a list of lists:

list_1=data_1.tolist()
list_2=data_2.tolist()
listoflists = []
listoflists.append(list_1)
listoflists.append(list_2)

SQL Server "AFTER INSERT" trigger doesn't see the just-inserted row

From the CREATE TRIGGER documentation:

deleted and inserted are logical (conceptual) tables. They are structurally similar to the table on which the trigger is defined, that is, the table on which the user action is attempted, and hold the old values or new values of the rows that may be changed by the user action. For example, to retrieve all values in the deleted table, use: SELECT * FROM deleted

So that at least gives you a way of seeing the new data.

I can't see anything in the docs which specifies that you won't see the inserted data when querying the normal table though...

Count words in a string method?

create variable count, state. initialize variables
if space is present keep count as it is else increase count. for eg:

if (string.charAt(i) == ' ' ) {
state = 0;
} else if (state == 0) {
state = 1;
count += 1;

Using :before and :after CSS selector to insert Html

content doesn't support HTML, only text. You should probably use javascript, jQuery or something like that.

Another problem with your code is " inside a " block. You should mix ' and " (class='headingDetail').

If content did support HTML you could end up in an infinite loop where content is added inside content.

How do I loop through or enumerate a JavaScript object?

If you want to iterate over non-enumerable properties as well, you can use Object.getOwnPropertyNames(obj) to return an array of all properties (enumerable or not) found directly upon a given object.

_x000D_

var obj = Object.create({}, {_x000D_
  // non-enumerable property_x000D_
  getFoo: {_x000D_
    value: function() { return this.foo; },_x000D_
    enumerable: false_x000D_
  }_x000D_
});_x000D_
_x000D_
obj.foo = 1; // enumerable property_x000D_
_x000D_
Object.getOwnPropertyNames(obj).forEach(function (name) {_x000D_
  document.write(name + ': ' + obj[name] + '<br/>');_x000D_
});

_x000D_

@ variables in Ruby on Rails

Use @title in your controllers when you want your variable to be available in your views.

The explanation is that @title is an instance variable while title is a local variable. Rails makes instance variables from controllers available to views because the template code (erb, haml, etc) is executed within the scope of the current controller instance.

VB.NET - Remove a characters from a String

The String class has a Replace method that will do that.

Dim clean as String
clean = myString.Replace(",", "")

Fast Bitmap Blur For Android SDK

I used this before..

public static Bitmap myblur(Bitmap image, Context context) {
            final float BITMAP_SCALE = 0.4f;
            final float BLUR_RADIUS = 7.5f;
            int width = Math.round(image.getWidth() * BITMAP_SCALE);
            int height = Math.round(image.getHeight() * BITMAP_SCALE);
            Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
            Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
            RenderScript rs = RenderScript.create(context);
            ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
            Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
            Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
            theIntrinsic.setRadius(BLUR_RADIUS);
            theIntrinsic.setInput(tmpIn);
            theIntrinsic.forEach(tmpOut);
            tmpOut.copyTo(outputBitmap);
            return outputBitmap;
        }

How to fix Error: "Could not find schema information for the attribute/element" by creating schema

When this happened to me (out of nowhere) I was about to dive into the top answer above, and then I figured I'd close the project, close Visual Studio, and then re-open everything. Problem solved. VS bug?

Install numpy on python3.3 - Install pip for python3

My issue was the failure to import numpy into my python files. I was receiving the "ModuleNotFoundError: No module named 'numpy'". I ran into the same issue and I was not referencing python3 on the installation of numpy. I inputted the following into my terminal for OSX and my problems were solved:

python3 -m pip install numpy

Disabling submit button until all fields have values

$('#user_input, #pass_input, #v_pass_input, #email').bind('keyup', function() {
    if(allFilled()) $('#register').removeAttr('disabled');
});

function allFilled() {
    var filled = true;
    $('body input').each(function() {
        if($(this).val() == '') filled = false;
    });
    return filled;
}

JSFiddle with your code, works :)

How to prepend a string to a column value in MySQL?

You can use the CONCAT function to do that:

UPDATE tbl SET col=CONCAT('test',col);

If you want to get cleverer and only update columns which don't already have test prepended, try

UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';

How do I write dispatch_after GCD in Swift 3, 4, and 5?

after Swift 3 release, also the @escaping has to be added

func delay(_ delay: Double, closure: @escaping () -> ()) {
  DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
    closure()
  }
}

Find and extract a number from a string

var match=Regex.Match(@"a99b",@"\d+");
if(match.Success)
{
    int val;
    if(int.TryParse(match.Value,out val))
    {
        //val is set
    }
}

I don't understand -Wl,-rpath -Wl,

You could also write

-Wl,-rpath=.

To get rid of that pesky space. It's arguably more readable than adding extra commas (it's exactly what gets passed to ld).

How to display an unordered list in two columns?

Thisd was a perfect solution for me, looking it for years:

http://css-tricks.com/forums/topic/two-column-unordered-list/

Use css gradient over background image

The accepted answer works well. Just for completeness (and since I like it's shortness), I wanted to share how to to it with compass (SCSS/SASS):

body{
  $colorStart: rgba(0,0,0,0);
  $colorEnd: rgba(0,0,0,0.8);
  @include background-image(linear-gradient(to bottom, $colorStart, $colorEnd), url("bg.jpg"));
}

How do I kill a VMware virtual machine that won't die?

Here's what I did based on

a) @Espo 's comments and
b) the fact that I only had Windows Task Manager to play with....

I logged onto the host machine, opened Task Manager and used the view menu to add the PID column to the Processes tab.

I wrote down (yes, with paper and a pen) the PID's for each and every instance of the vmware-wmx.exe process that was running on the box.

Using the VMWare console, I suspended the errant virtual machine.

When I resumed it, I could then identify the vmware-vmx process that corresponded to my machine and could kill it.

There doesn't seem to have been any ill effects so far.

How can I search (case-insensitive) in a column using LIKE wildcard?

SELECT  *
FROM    trees
WHERE   trees.`title` COLLATE UTF8_GENERAL_CI LIKE '%elm%'

Actually, if you add COLLATE UTF8_GENERAL_CI to your column's definition, you can just omit all these tricks: it will work automatically.

ALTER TABLE trees 
 MODIFY COLUMN title VARCHAR(…) CHARACTER 
 SET UTF8 COLLATE UTF8_GENERAL_CI.

This will also rebuild any indexes on this column so that they could be used for the queries without leading '%'

Select Top and Last rows in a table (SQL server)

To get the bottom 1000 you will want to order it by a column in descending order, and still take the top 1000.

SELECT TOP 1000 *
FROM [SomeTable]
ORDER BY MySortColumn DESC

If you care for it to be in the same order as before you can use a common table expression for that:

;WITH CTE AS (
    SELECT TOP 1000 *
    FROM [SomeTable]
    ORDER BY MySortColumn DESC
)

SELECT * 
FROM CTE
ORDER BY MySortColumn

Git Server Like GitHub?

You can also install Indefero, it is a GPL clone of GoogleCode, as it supports both Subversion and Git, you can have a smooth transition. I am the author of Indefero.

Using Javascript can you get the value from a session attribute set by servlet in the HTML page

<%
String session_val = (String)session.getAttribute("sessionval"); 
System.out.println("session_val"+session_val);
%>
<html>
<head>
<script type="text/javascript">
var session_obj= '<%=session_val%>';
alert("session_obj"+session_obj);
</script>
</head>
</html>

How does the "final" keyword in Java work? (I can still modify an object.)

Final keyword has a numerous way to use:

A final class cannot be subclassed.
A final method cannot be overridden by subclasses
A final variable can only be initialized once

Other usage:

When an anonymous inner class is defined within the body of a method, all variables declared final in the scope of that method are accessible from within the inner class

A static class variable will exist from the start of the JVM, and should be initialized in the class. The error message won't appear if you do this.

File Explorer in Android Studio

You can start Android Device Monitor from the Android Studio (green robot icon on the toolbar, to the left of the help icon). From the ADM, select the device/emulator, then select the File Explorer tab.

Django. Override save for model

Query the database for an existing record with the same PK. Compare the file sizes and checksums of the new and existing images to see if they're the same.

Execute combine multiple Linux commands in one line

You can use as the following code;

cd /my_folder && \
rm *.jar && \
svn co path to repo && \
mvn compile package install

It works...

How to use a variable inside a regular expression?

You can use format keyword as well for this.Format method will replace {} placeholder to the variable which you passed to the format method as an argument.

if re.search(r"\b(?=\w)**{}**\b(?!\w)".**format(TEXTO)**, subject, re.IGNORECASE):
    # Successful match**strong text**
else:
    # Match attempt failed

Javascript to convert UTC to local time

This should work

var date = new Date('2012-11-29 17:00:34 UTC');
date.toString()

Create aar file in Android Studio

To create AAR

while creating follow below steps.

File->New->New Module->Android Library and create.

To generate AAR

Go to gradle at top right pane in android studio follow below steps.

Gradle->Drop down library name -> tasks-> build-> assemble or assemble release

AAR will be generated in build/outputs/aar/

But if we want AAR to get generated in specific folder in project directory with name you want, modify your app level build.gradle like below

defaultConfig {
    minSdkVersion 26
    targetSdkVersion 28
    versionCode System.getenv("BUILD_NUMBER") as Integer ?: 1
    versionName "0.0.${versionCode}"


    libraryVariants.all { variant ->

        variant.outputs.all { output ->
            outputFileName = "/../../../../release/" + ("your_recommended_name.aar")
        }
    }
}

Now it will create folder with name "release" in project directory which will be having AAR.

To import "aar" into project,check below link.

How to manually include external aar package using new Gradle Android Build System

box-shadow on bootstrap 3 container

Add an additional div around all container divs you want the drop shadow to encapsulate. Add the classes drop-shadow and container to the additional div. The class .container will keep the fluidity. Use the class .drop-shadow (or whatever you like) to add the box-shadow property. Then target the .drop-shadow div and negate the unwanted styles .container adds--such as left & right padding.

Example: http://jsfiddle.net/SHLu4/2/

It'll be something like:

<div class="container drop-shadow">
    <div class="container">
        <div class="row">
            <div class="col-md-8">Main Area</div>
            <div class="col-md-4">Side Area</div>
        </div>
    </div>
</div>

And your CSS:

<style>
    .drop-shadow {
        -webkit-box-shadow: 0 0 5px 2px rgba(0, 0, 0, .5);
        box-shadow: 0 0 5px 2px rgba(0, 0, 0, .5);
    }
    .container.drop-shadow {
        padding-left:0;
        padding-right:0;
    }
</style>

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

None of the above worked for me (tomcat 7.0.62)... As Sensei_Shoh notes see the class above the message and add this to logging.properties. My logs were:

Jan 18, 2016 8:44:21 PM org.apache.catalina.startup.TldConfig execute
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

so I added

org.apache.catalina.startup.TldConfig.level = FINE

in conf/logging.properties

After that I got so many "offending" files that I did not bother skipping them (and also reverted to normal logging...)

How to configure port for a Spring Boot application

If you would like to run it locally, use this -

mvn spring-boot:run -Drun.jvmArguments='-Dserver.port=8085'

As of Spring Boot 2.0, here's the command that works (clues were here):

mvn spring-boot:run -Dspring-boot.run.arguments=--server.port=8085

How to enable core dump in my Linux C++ program

By default many profiles are defaulted to 0 core file size because the average user doesn't know what to do with them.

Try ulimit -c unlimited before running your program.

sort files by date in PHP

This would get all files in path/to/files with an .swf extension into an array and then sort that array by the file's mtime

$files = glob('path/to/files/*.swf');
usort($files, function($a, $b) {
    return filemtime($b) - filemtime($a);
});

The above uses an Lambda function and requires PHP 5.3. Prior to 5.3, you would do

usort($files, create_function('$a,$b', 'return filemtime($b)-filemtime($a);'));

If you don't want to use an anonymous function, you can just as well define the callback as a regular function and pass the function name to usort instead.

With the resulting array, you would then iterate over the files like this:

foreach($files as $file){
    printf('<tr><td><input type="checkbox" name="box[]"></td>
            <td><a href="%1$s" target="_blank">%1$s</a></td>
            <td>%2$s</td></tr>', 
            $file, // or basename($file) for just the filename w\out path
            date('F d Y, H:i:s', filemtime($file)));
}

Note that because you already called filemtime when sorting the files, there is no additional cost when calling it again in the foreach loop due to the stat cache.

Selecting a row of pandas series/dataframe by integer index

you can loop through the data frame like this .

for ad in range(1,dataframe_c.size):
    print(dataframe_c.values[ad])

How to put the legend out of the plot

I simply used the string 'center left' for the location, like in matlab. I imported pylab from matplotlib.

see the code as follow:

from matplotlib as plt
from matplotlib.font_manager import FontProperties
t = A[:,0]
sensors = A[:,index_lst]
    
for i in range(sensors.shape[1]):
    plt.plot(t,sensors[:,i])
        
plt.xlabel('s')
plt.ylabel('°C')
lgd = plt.legend(loc='center left', bbox_to_anchor=(1, 0.5),fancybox = True, shadow = True)

'ssh-keygen' is not recognized as an internal or external command

I got it fixed by just adding ssh-keygen to my environment variables.

How to send parameters with jquery $.get()

Try this:

$.ajax({
    type: 'get',
    url: 'manageproducts.do',
    data: 'option=1',
    success: function(data) {

        availableProductNames = data.split(",");

        alert(availableProductNames);

    }
});

Also You have a few errors in your sample code, not sure if that was causing the error or it was just a typo upon entering the question.

^[A-Za-Z ][A-Za-z0-9 ]* regular expression?

^[A-Za-z](\W|\w)*

(\W|\w) will ensure that every subsequent letter is word(\w) or non word(\W)

instead of (\W|\w)* you can also use .* where . means absolutely anything just like (\w|\W)

How to manipulate arrays. Find the average. Beginner Java

The Java 8 streaming api offers an elegant alternative:

public static void main(String[] args) {
    double avg = Arrays.stream(new int[]{1,3,2,5,8}).average().getAsDouble();

    System.out.println("avg: " + avg);
}

Rotating a point about another point (2D)

I struggled while working MS OCR Read API which returns back angle of rotation in range (-180, 180]. So I have to do an extra step of converting negative angles to positive. I hope someone struggling with point rotation with negative or positive angles can use the following.

def rotate(origin, point, angle):
    """
    Rotate a point counter-clockwise by a given angle around a given origin.
    """
    # Convert negative angles to positive
    angle = normalise_angle(angle)

    # Convert to radians
    angle = math.radians(angle)

    # Convert to radians
    ox, oy = origin
    px, py = point
    
    # Move point 'p' to origin (0,0)
    _px = px - ox
    _py = py - oy
    
    # Rotate the point 'p' 
    qx = (math.cos(angle) * _px) - (math.sin(angle) * _py)
    qy = (math.sin(angle) * _px) + (math.cos(angle) * _py)
    
    # Move point 'p' back to origin (ox, oy)
    qx = ox + qx
    qy = oy + qy
    
    return [qx, qy]


def normalise_angle(angle):
    """ If angle is negative then convert it to positive. """
    if (angle != 0) & (abs(angle) == (angle * -1)):
        angle = 360 + angle
    return angle

Can Flask have optional URL parameters?

@user.route('/<userId>/')  # NEED '/' AFTER LINK
@user.route('/<userId>/<username>')
def show(userId, username=None):
    pass

https://flask.palletsprojects.com/en/1.1.x/quickstart/#unique-urls-redirection-behavior

C# LINQ find duplicates in List

Linq query:

var query = from s2 in (from s in someList group s by new { s.Column1, s.Column2 } into sg select sg) where s2.Count() > 1 select s2;

Right way to split an std::string into a vector<string>

A convenient way would be boost's string algorithms library.

#include <boost/algorithm/string/classification.hpp> // Include boost::for is_any_of
#include <boost/algorithm/string/split.hpp> // Include for boost::split
// ...

std::vector<std::string> words;
std::string s;
boost::split(words, s, boost::is_any_of(", "), boost::token_compress_on);

UITableView example for Swift

In Swift 4.1 and Xcode 9.4.1

Add UITableViewDataSource, UITableViewDelegate delegated to your class.
Create table view variable and array.
In viewDidLoad create table view.
Call table view delegates
Call table view delegate functions based on your requirement.

import UIKit
// 1
class yourViewController: UIViewController , UITableViewDataSource, UITableViewDelegate { 

// 2
var yourTableView:UITableView = UITableView()
let myArray = ["row 1", "row 2", "row 3", "row 4"]

override func viewDidLoad() {
    super.viewDidLoad()

    // 3
    yourTableView.frame = CGRect(x: 10, y: 10, width: view.frame.width-20, height: view.frame.height-200)
    self.view.addSubview(yourTableView)

    // 4
    yourTableView.dataSource = self
    yourTableView.delegate = self

}

// 5
// MARK - UITableView Delegates
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return myArray.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

var cell : UITableViewCell? = tableView.dequeueReusableCell(withIdentifier: "cell")
    if cell == nil {
        cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: "cell")
    }
    if self. myArray.count > 0 {
        cell?.textLabel!.text = self. myArray[indexPath.row]
    }
    cell?.textLabel?.numberOfLines = 0

    return cell!
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

    return 50.0
}

If you are using storyboard, no need for Step 3.

But you need to create IBOutlet for your table view before Step 4.

How to activate virtualenv?

instead of ./activate

use source activate

Including another class in SCSS

Another option could be using an Attribute Selector:

[class^="your-class-name"]{
  //your style here
}

Whereas every class starting with "your-class-name" uses this style.

So in your case, you could do it like so:

[class^="class"]{
  display: inline-block;
  //some other properties
  &:hover{
   color: darken(#FFFFFF, 10%);
 }  
}

.class-b{
  //specifically for class b
  width: 100px;
  &:hover{
     color: darken(#FFFFFF, 20%);
  }
}

More about Attribute Selectors on w3Schools

Running npm command within Visual Studio Code

On Win10 I had to run VSCode as administrator to npm commands work.

How do I run a Python script on my web server?

Very simply, you can rename your Python script to "pythonscript.cgi". Post that in your cgi-bin directory, add the appropriate permissions and browse to it.

This is a great link you can start with.

Here's another good one.

Hope that helps.

EDIT (09/12/2015): The second link has long been removed. Replaced it with one that provides information referenced from the original.

Best way to move files between S3 buckets?

If you have a unix host within AWS, then use s3cmd from s3tools.org. Set up permissions so that your key as read access to your development bucket. Then run:

s3cmd cp -r s3://productionbucket/feed/feedname/date s3://developmentbucket/feed/feedname

Class constants in python

Expanding on betabandido's answer, you could write a function to inject the attributes as constants into the module:

def module_register_class_constants(klass, attr_prefix):
    globals().update(
        (name, getattr(klass, name)) for name in dir(klass) if name.startswith(attr_prefix)
    )

class Animal(object):
    SIZE_HUGE = "Huge"
    SIZE_BIG = "Big"

module_register_class_constants(Animal, "SIZE_")

class Horse(Animal):
    def printSize(self):
        print SIZE_BIG

best way to preserve numpy arrays on disk

I'm a big fan of hdf5 for storing large numpy arrays. There are two options for dealing with hdf5 in python:

http://www.pytables.org/

http://www.h5py.org/

Both are designed to work with numpy arrays efficiently.

Converting JSON data to Java object

If you use any kind of special maps with keys or values also of special maps, you will find it's not contemplated by the implementation of google.

What is the best way to know if all the variables in a Class are null?

I think this is a solution that solves your problem easily: (return true if any of the parameters is not null)

  public boolean isUserEmpty(){ 
boolean isEmpty;
isEmpty =  isEmpty = Stream.of(id,
            name)
        .anyMatch(userParameter -> userParameter != null);

return isEmpty;}

Another solution to the same task is:(you can change it to if(isEmpty==0) checks if all the parameters are null.

public boolean isUserEmpty(){  
       long isEmpty;
            isEmpty = Stream.of(id,
                    name)
                    .filter(userParameter -> userParameter != null).count();

            if (isEmpty > 0) {
                return true;
            } else {
                return false;
            }
    }

How to copy marked text in notepad++

I am adding this for completeness as this post hits high in Google search results.

You can actually copy all from a regex search, just not in one step.

Use Mark under Search and enter the regex in Find What.
Select Bookmark Line and click Mark All.
Click Search -> Bookmark -> Copy Bookmarked Lines.
Paste into a new document.
You may need to remove some unwanted text in the line that was not part of the regex with a search and replace.

What are MVP and MVC and what is the difference?

You forgot about Action-Domain-Responder (ADR).

As explained in some graphics above, there's a direct relation/link between the Model and the View in MVC. An action is performed on the Controller, which will execute an action on the Model. That action in the Model, will trigger a reaction in the View. The View, is always updated when the Model's state changes.

Some people keep forgetting, that MVC was created in the late 70", and that the Web was only created in late 80"/early 90". MVC wasn't originally created for the Web, but for Desktop applications instead, where the Controller, Model and View would co-exist together.

Because we use web frameworks (eg:. Laravel) that still use the same naming conventions (model-view-controller), we tend to think that it must be MVC, but it's actually something else.

Instead, have a look at Action-Domain-Responder. In ADR, the Controller gets an Action, which will perform an operation in the Model/Domain. So far, the same. The difference is, it then collects that operation's response/data, and pass it to a Responder (eg:. view()) for rendering. When a new action is requested on the same component, the Controller is called again, and the cycle repeats itself. In ADR, there's no connection between the Model/Domain and the View (Reponser's response).

Note: Wikipedia states that "Each ADR action, however, is represented by separate classes or closures.". This is not necessarily true. Several Actions can be in the same Controller, and the pattern is still the same.

mvc adr model-view-controller action-domain-responder

Loading another html page from javascript

You can include a .js file which has the script to set the

window.location.href = url;

Where url would be the url you wish to load.

Get Hard disk serial Number

Below a fully functional method to get hard disk serial number:

public string GetHardDiskSerialNo()
    {
        ManagementClass mangnmt = new ManagementClass("Win32_LogicalDisk");
        ManagementObjectCollection mcol = mangnmt.GetInstances();
        string result = "";
        foreach (ManagementObject strt in mcol)
        {
            result += Convert.ToString(strt["VolumeSerialNumber"]);
        }
        return result;
    }

PHP memcached Fatal error: Class 'Memcache' not found

Dispite what the accepted answer says in the comments, the correct way to install 'Memcache' is:

sudo apt-get install php5-memcache

NOTE Memcache & Memcached are two distinct although related pieces of software, that are often confused.

EDIT As this is now an old post I thought it worth mentioning that you should replace php5 with your php version number.

Get root view from current activity

For those of you who are using the Data Binding Library, to get the root of the current activity, simply use:

View rootView = dataBinding.getRoot();

And for Kotlin users, it's even simpler:

val rootView = dataBinding.root

Get domain name from given url

I made a small treatment after the URI object creation

 if (url.startsWith("http:/")) {
        if (!url.contains("http://")) {
            url = url.replaceAll("http:/", "http://");
        }
    } else {
        url = "http://" + url;
    }
    URI uri = new URI(url);
    String domain = uri.getHost();
    return domain.startsWith("www.") ? domain.substring(4) : domain;

How to tag docker image with docker-compose

Original answer Nov 20 '15:

No option for a specific tag as of Today. Docker compose just does its magic and assigns a tag like you are seeing. You can always have some script call docker tag <image> <tag> after you call docker-compose.

Now there's an option as described above or here

build: ./dir
image: webapp:tag

Disable F5 and browser refresh using JavaScript

This is the code I'm using to disable refresh on IE and firefox which works for the following key combinations:

F5 | Ctrl + F5 | Ctrl + R

//this code handles the F5/Ctrl+F5/Ctrl+R
document.onkeydown = checkKeycode
function checkKeycode(e) {
    var keycode;
    if (window.event)
        keycode = window.event.keyCode;
    else if (e)
        keycode = e.which;
                
    // Mozilla firefox
    if ($.browser.mozilla) {
        if (keycode == 116 ||(e.ctrlKey && keycode == 82)) {
            if (e.preventDefault)
            {
                e.preventDefault();
                e.stopPropagation();
            }
        }
    } 
    // IE
    else if ($.browser.msie) {
        if (keycode == 116 || (window.event.ctrlKey && keycode == 82)) {
            window.event.returnValue = false;
            window.event.keyCode = 0;
            window.status = "Refresh is disabled";
        }
    }
}

If you don't want to use useragent to detect what type of browser it is ($.browser uses navigator.userAgent to determine the platform), you can use

if('MozBoxSizing' in document.documentElement.style) which returns true for firefox

MySQL INNER JOIN select only one row from second table

There are two problems with your query:

Every table and subquery needs a name, so you have to name the subquery INNER JOIN (SELECT ...) AS p ON ....
The subquery as you have it only returns one row period, but you actually want one row for each user. For that you need one query to get the max date and then self-join back to get the whole row.

Assuming there are no ties for payments.date, try:

    SELECT u.*, p.* 
    FROM (
        SELECT MAX(p.date) AS date, p.user_id 
        FROM payments AS p
        GROUP BY p.user_id
    ) AS latestP
    INNER JOIN users AS u ON latestP.user_id = u.id
    INNER JOIN payments AS p ON p.user_id = u.id AND p.date = latestP.date
    WHERE u.package = 1

org.apache.jasper.JasperException: Unable to compile class for JSP:

The problem is caused because you need to import the pageNumber.Member class in your JSP. Make sure to also include another packages and classes like java.util.List.

<%@ page import="pageNumber.*, java.util.*" %>

Still, you have a major problem by using scriptlets in your JSP. Refer to How to avoid Java Code in JSP-Files? and start practicing EL and JSTL and focusing more on a MVC solution instead.

Apache won't start in wamp

I was having the same problem, the mysql service was starting but not the apache service, the main problem about that is one of your virtual hosts isn't config. correctly, all i did was deleted the virtual host that i created "D:\wamp\bin\apache\apache2.4.23\conf\extra\httpd-vhosts, restarted all services apache service started working correctly and so i just went to localhost and added a virtual host automatically and so it worked!!

Filtering lists using LINQ

var thisList = new List<string>{ "a", "b", "c" };
var otherList = new List<string> {"a", "b"};

var theOnesThatDontMatch = thisList
        .Where(item=> otherList.All(otherItem=> item != otherItem))
        .ToList();

var theOnesThatDoMatch = thisList
        .Where(item=> otherList.Any(otherItem=> item == otherItem))
        .ToList();

Console.WriteLine("don't match: {0}", string.Join(",", theOnesThatDontMatch));
Console.WriteLine("do match: {0}", string.Join(",", theOnesThatDoMatch));

//Output:
//don't match: c
//do match: a,b

Adapt the list types and lambdas accordingly, and you can filter out anything.

https://dotnetfiddle.net/6bMCvN

Rails 4 - Strong Parameters - Nested Objects

I found this suggestion useful in my case:

  def product_params
    params.require(:product).permit(:name).tap do |whitelisted|
      whitelisted[:data] = params[:product][:data]
    end
  end

Check this link of Xavier's comment on github.

This approach whitelists the entire params[:measurement][:groundtruth] object.

Using the original questions attributes:

  def product_params
    params.require(:measurement).permit(:name, :groundtruth).tap do |whitelisted|
      whitelisted[:groundtruth] = params[:measurement][:groundtruth]
    end
  end

jquery.ajax Access-Control-Allow-Origin

At my work we have our restful services on a different port number and the data resides in db2 on a pair of AS400s. We typically use the $.getJSON AJAX method because it easily returns JSONP using the ?callback=? without having any issues with CORS.

data ='USER=<?echo trim($USER)?>' +
         '&QRYTYPE=' + $("input[name=QRYTYPE]:checked").val();

        //Call the REST program/method returns: JSONP 
        $.getJSON( "http://www.stackoverflow.com/rest/resttest?callback=?",data)
        .done(function( json ) {        

              //  loading...
                if ($.trim(json.ERROR) != '') {
                    $("#error-msg").text(message).show();
                }
                else{
                    $(".error").hide();
                    $("#jsonp").text(json.whatever);

                }

        })  
        .fail(function( jqXHR, textStatus, error ) {
        var err = textStatus + ", " + error;
        alert('Unable to Connect to Server.\n Try again Later.\n Request Failed: ' + err);
        });

How to programmatically turn off WiFi on Android device?

You need the following permissions in your manifest file:

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

Then you can use the following in your activity class:

WifiManager wifiManager = (WifiManager) this.getApplicationContext().getSystemService(Context.WIFI_SERVICE); 
wifiManager.setWifiEnabled(true);
wifiManager.setWifiEnabled(false);

Use the following to check if it's enabled or not

boolean wifiEnabled = wifiManager.isWifiEnabled()

You'll find a nice tutorial on the subject on this site.

C++ - Assigning null to a std::string

The else case is unncecessary, when you create a string object it is empty by default.

How to prevent scientific notation in R?

To set the use of scientific notation in your entire R session, you can use the scipen option. From the documentation (?options):

‘scipen’: integer.  A penalty to be applied when deciding to print
          numeric values in fixed or exponential notation.  Positive
          values bias towards fixed and negative towards scientific
          notation: fixed notation will be preferred unless it is more
          than ‘scipen’ digits wider.

So in essence this value determines how likely it is that scientific notation will be triggered. So to prevent scientific notation, simply use a large positive value like 999:

options(scipen=999)

Force a screen update in Excel VBA

Add a DoEvents function inside the loop, see below.

You may also want to ensure that the Status bar is visible to the user and reset it when your code completes.

Sub ProgressMeter()

Dim booStatusBarState As Boolean
Dim iMax As Integer
Dim i As Integer

iMax = 10000

    Application.ScreenUpdating = False
''//Turn off screen updating

    booStatusBarState = Application.DisplayStatusBar
''//Get the statusbar display setting

    Application.DisplayStatusBar = True
''//Make sure that the statusbar is visible

    For i = 1 To iMax ''// imax is usually 30 or so
        fractionDone = CDbl(i) / CDbl(iMax)
        Application.StatusBar = Format(fractionDone, "0%") & " done..."
        ''// or, alternatively:
        ''// statusRange.value = Format(fractionDone, "0%") & " done..."
        ''// Some code.......

        DoEvents
        ''//Yield Control

    Next i

    Application.DisplayStatusBar = booStatusBarState
''//Reset Status bar display setting

    Application.StatusBar = False
''//Return control of the Status bar to Excel

    Application.ScreenUpdating = True
''//Turn on screen updating

End Sub

How to connect to a remote Git repository?

It's simple and follow the small Steps to proceed:

Install git on the remote server say some ec2 instance
Now create a project folder `$mkdir project.git
$cd project and execute $git init --bare

Let's say this project.git folder is present at your ip with address inside home_folder/workspace/project.git, forex- ec2 - /home/ubuntu/workspace/project.git

Now in your local machine, $cd into the project folder which you want to push to git execute the below commands:

git init .
git remote add origin [email protected]:/home/ubuntu/workspace/project.git
git add .
git commit -m "Initial commit"

Below is an optional command but found it has been suggested as i was working to setup the same thing

git config --global remote.origin.receivepack "git receive-pack"

git pull origin master
git push origin master

This should work fine and will push the local code to the remote git repository.

To check the remote fetch url, cd project_folder/.git and cat config, this will give the remote url being used for pull and push operations.

You can also use an alternative way, after creating the project.git folder on git, clone the project and copy the entire content into that folder. Commit the changes and it should be the same way. While cloning make sure you have access or the key being is the secret key for the remote server being used for deployment.

Why has it failed to load main-class manifest attribute from a JAR file?

I was getting the same error when i ran:
jar cvfm test.jar Test.class Manifest.txt

What resolved it was this:
jar cvfm test.jar Manifest.txt Test.class

My manifest has the entry point as given in oracle docs (make sure there is a new line character at the end of the file):
Main-Class: Test

MySQL default datetime through phpmyadmin

You're getting that error because the default value current_time is not valid for the type DATETIME. That's what it says, and that's whats going on.

The only field you can use current_time on is a timestamp.

Adding custom radio buttons in android

In order to hide the default radio button, I'd suggest to remove the button instead of making it transparent as all visual feedback is handled by the drawable background :

android:button="@null"

Also it would be better to use styles as there are several radio buttons :

<RadioButton style="@style/RadioButtonStyle" ... />

<style name="RadioButtonStyle" parent="@android:style/Widget.CompoundButton">
    <item name="android:background">@drawable/customButtonBackground</item>
    <item name="android:button">@null</item>
</style>

You'll need the Seslyn customButtonBackground drawable too.

How to open some ports on Ubuntu?

If you want to open it for a range and for a protocol

ufw allow 11200:11299/tcp
ufw allow 11200:11299/udp

How to list running screen sessions?

To list all of the screen sessions for a user, run the following command as that user:

screen -ls

To see all screen sessions on a specific machine you can do:

ls -laR /var/run/screen/

I get this on my machine:

gentle ~ # ls -laR /var/run/screen/

/var/run/screen/:
total 1
drwxrwxr-x  4 root utmp   96 Mar  1  2005 .
drwxr-xr-x 10 root root  840 Feb  1 03:10 ..
drwx------  2 josh users  88 Jan 13 11:33 S-josh
drwx------  2 root root   48 Feb 11 10:50 S-root

/var/run/screen/S-josh:
total 0
drwx------ 2 josh users 88 Jan 13 11:33 .
drwxrwxr-x 4 root utmp  96 Mar  1  2005 ..
prwx------ 1 josh users  0 Feb 11 10:41 12931.pts-0.gentle

/var/run/screen/S-root:
total 0
drwx------ 2 root root 48 Feb 11 10:50 .
drwxrwxr-x 4 root utmp 96 Mar  1  2005 ..

This is a rather brilliantly Unixy use of Unix Sockets wrapped in filesystem permissions to handle security, state, and streams.

Delete all documents from index/type without deleting type

In Kibana Console:

POST calls-xin-test-2/_delete_by_query
{
  "query": { 
    "match_all": {}
  }
}

Accessing Imap in C#

MailSystem.NET contains all your need for IMAP4. It's free & open source.

(I'm involved in the project)

Capitalize the first letter of string in AngularJs

{{ uppercase_expression | capitaliseFirst}} should work

How can I change cols of textarea in twitter-bootstrap?

The other answers didn't work for me. This did:

    <div class="span6">
      <h2>Document</h2>
        </p>
        <textarea class="field span12" id="textarea" rows="6" placeholder="Enter a short synopsis"></textarea>
        <button class="btn">Upload</button>
    </div>

Note the span12 in a div with span6.

jQuery checkbox checked state changed event

Just another solution

$('.checkbox_class').on('change', function(){ // on change of state
   if(this.checked) // if changed state is "CHECKED"
    {
        // do the magic here
    }
})

PHP Fatal error: Cannot redeclare class

This error might also occur if you define the __construct method more than once.

How to persist a property of type List<String> in JPA?

Ok i know its bit late. But for those brave souls that will see this as time passes.

As written in documentation:

@Basic: The simplest type of mapping to a database column. The Basic annotation can be applied to a persistent property or instance variable of any of the following types: Java primitive types, [...], enums, and any other type that implements java.io.Serializable.

The important part is type that implements Serializable

So by far the most simple and easiest to use solution is simply using ArrayList instead of List (or any serializable container):

@Basic
ArrayList<Color> lovedColors;

@Basic
ArrayList<String> catNames;

Remember however that this will use system serialization, so it will come with some price, such as:

if serialized object model will change, u might not be able to restore data
small overhead is added for each element stored.

In short

it is quite simple to store flags or few elements, but i would not recomend it to store data that might grow big.

Show all current locks from get_lock

I found following way which can be used if you KNOW name of lock

select IS_USED_LOCK('lockname');

however i not found any info about how to list all names.

Mongodb: failed to connect to server on first connect

I was running mongod in a PowerShell instance. I was not getting any output in the powershell console from mongod. I clicked on the PowerShell instance where mongod was running, hit enter and and execution resumed. I am not sure what caused the execution to halt, but I can connect to this instance of mongo immediately now.

AWS - Disconnected : No supported authentication methods available (server sent :publickey)

While trying to connect to a SiteGround server via Putty I had the same problem. Their instructions are pretty thorough, and must work for some people, but didn't work for me.

They recommend running pageant.exe, which runs in the background. You register your key(s) with Pageant, and it's supposed to let Putty know about the keys when it tries to connect.

In a couple of places I found suggestions to specify the key directly in the Putty session definition: Putty Configuration > Connection > SSH > Auth > "Private key file for authentication", then browse to your key file in .ppk format.

Doing this without running Pageant resolved the problem for me.

Create code first, many to many, with additional fields in association table

I want to propose a solution where both flavors of a many-to-many configuration can be achieved.

The "catch" is we need to create a view that targets the Join Table, since EF validates that a schema's table may be mapped at most once per EntitySet.

This answer adds to what's already been said in previous answers and doesn't override any of those approaches, it builds upon them.

The model:

public class Member
{
    public int MemberID { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }

    public virtual ICollection<Comment> Comments { get; set; }
    public virtual ICollection<MemberCommentView> MemberComments { get; set; }
}

public class Comment
{
    public int CommentID { get; set; }
    public string Message { get; set; }

    public virtual ICollection<Member> Members { get; set; }
    public virtual ICollection<MemberCommentView> MemberComments { get; set; }
}

public class MemberCommentView
{
    public int MemberID { get; set; }
    public int CommentID { get; set; }
    public int Something { get; set; }
    public string SomethingElse { get; set; }

    public virtual Member Member { get; set; }
    public virtual Comment Comment { get; set; }
}

The configuration:

using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.ModelConfiguration;

public class MemberConfiguration : EntityTypeConfiguration<Member>
{
    public MemberConfiguration()
    {
        HasKey(x => x.MemberID);

        Property(x => x.MemberID).HasColumnType("int").IsRequired();
        Property(x => x.FirstName).HasColumnType("varchar(512)");
        Property(x => x.LastName).HasColumnType("varchar(512)")

        // configure many-to-many through internal EF EntitySet
        HasMany(s => s.Comments)
            .WithMany(c => c.Members)
            .Map(cs =>
            {
                cs.ToTable("MemberComment");
                cs.MapLeftKey("MemberID");
                cs.MapRightKey("CommentID");
            });
    }
}

public class CommentConfiguration : EntityTypeConfiguration<Comment>
{
    public CommentConfiguration()
    {
        HasKey(x => x.CommentID);

        Property(x => x.CommentID).HasColumnType("int").IsRequired();
        Property(x => x.Message).HasColumnType("varchar(max)");
    }
}

public class MemberCommentViewConfiguration : EntityTypeConfiguration<MemberCommentView>
{
    public MemberCommentViewConfiguration()
    {
        ToTable("MemberCommentView");
        HasKey(x => new { x.MemberID, x.CommentID });

        Property(x => x.MemberID).HasColumnType("int").IsRequired();
        Property(x => x.CommentID).HasColumnType("int").IsRequired();
        Property(x => x.Something).HasColumnType("int");
        Property(x => x.SomethingElse).HasColumnType("varchar(max)");

        // configure one-to-many targeting the Join Table view
        // making all of its properties available
        HasRequired(a => a.Member).WithMany(b => b.MemberComments);
        HasRequired(a => a.Comment).WithMany(b => b.MemberComments);
    }
}

The context:

using System.Data.Entity;

public class MyContext : DbContext
{
    public DbSet<Member> Members { get; set; }
    public DbSet<Comment> Comments { get; set; }
    public DbSet<MemberCommentView> MemberComments { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Configurations.Add(new MemberConfiguration());
        modelBuilder.Configurations.Add(new CommentConfiguration());
        modelBuilder.Configurations.Add(new MemberCommentViewConfiguration());

        OnModelCreatingPartial(modelBuilder);
     }
}

From Saluma's (@Saluma) answer

If you now want to find all comments of members with LastName = "Smith" for example you can write a query like this:

This still works...

var commentsOfMembers = context.Members
    .Where(m => m.LastName == "Smith")
    .SelectMany(m => m.MemberComments.Select(mc => mc.Comment))
    .ToList();

...but could now also be...

var commentsOfMembers = context.Members
    .Where(m => m.LastName == "Smith")
    .SelectMany(m => m.Comments)
    .ToList();

Or to create a list of members with name "Smith" (we assume there is more than one) along with their comments you can use a projection:

This still works...

var membersWithComments = context.Members
    .Where(m => m.LastName == "Smith")
    .Select(m => new
    {
        Member = m,
        Comments = m.MemberComments.Select(mc => mc.Comment)
    })
    .ToList();

...but could now also be...

var membersWithComments = context.Members
    .Where(m => m.LastName == "Smith")
    .Select(m => new
    {
        Member = m,
        m.Comments
    })
        .ToList();

If you want to remove a comment from a member

var comment = ... // assume comment from member John Smith
var member = ... // assume member John Smith

member.Comments.Remove(comment);

If you want to Include() a member's comments

var member = context.Members
    .Where(m => m.FirstName == "John", m.LastName == "Smith")
    .Include(m => m.Comments);

This all feels like syntactic sugar, however it does get you a few perks if you're willing to go through the additional configuration. Either way you seem to be able to get the best of both approaches.

How to change default JRE for all Eclipse workspaces?

Finally got it: The way Eclipse picks up the JRE is using the system's PATH.

I did not have C:\home\SFTWR\jdk1.6.0_21\bin in the path at all before and I did have C:\Program Files (x86)\Java\jre6\bin. I had both JRE_HOME and JAVA_HOME set to C:\home\SFTWR\jdk1.6.0_21 but neither of those two mattered. I guess Eclipse did (something to the effect of) where java (or which on UNIX/Linux) to see where Java is in the path and took the JRE to which that java.exe belonged. In my case, despite all the configuration tweaks I had done (including eclipse.ini -vm option as suggested above), it remained stuck to what was in the path.

I removed the old JRE bin from the path, put the new one in, and it works for all workspaces.

Updating a JSON object using Javascript

For example I am using this technique in Basket functionality.

Let us add new Item to Basket.

var productArray=[];


$(document).on('click','[cartBtn]',function(e){
  e.preventDefault();
  $(this).html('<i class="fa fa-check"></i>Added to cart');
  console.log('Item added ');
  var productJSON={"id":$(this).attr('pr_id'), "nameEn":$(this).attr('pr_name_en'), "price":$(this).attr('pr_price'), "image":$(this).attr('pr_image'), "quantity":1, "discount":0, "total":$(this).attr('pr_price')};


  if(localStorage.getObj('product')!==null){
    productArray=localStorage.getObj('product');
    productArray.push(productJSON);  
    localStorage.setObj('product', productArray);  
  }
  else{
    productArray.push(productJSON);  
    localStorage.setObj('product', productArray);  
  }


  itemCountInCart(productArray.length);

});

After adding some item to basket - generates json array like this

[
    {
        "id": "95",
        "nameEn": "New Braslet",
        "price": "8776",
        "image": "1462012394815.jpeg",
        "quantity": 1,
        "discount": 0,
        "total": "8776"
    },
    {
        "id": "96",
        "nameEn": "new braslet",
        "price": "76",
        "image": "1462012431497.jpeg",
        "quantity": 1,
        "discount": 0,
        "total": "76"
    },
    {
        "id": "97",
        "nameEn": "khjk",
        "price": "87",
        "image": "1462012483421.jpeg",
        "quantity": 1,
        "discount": 0,
        "total": "87"
    }
]

For Removing some item from Basket.

$(document).on('click','[itemRemoveBtn]',function(){

var arrayFromLocal=localStorage.getObj('product');
findAndRemove(arrayFromLocal,"id",$(this).attr('basketproductid'));
localStorage.setObj('product', arrayFromLocal);
loadBasketFromLocalStorageAndRender();
});

//This function will remove element by specified property. In my case this is ID.
function findAndRemove(array, property, value) {
  array.forEach(function(result, index) {
    if(result[property] === value) {
      //Remove from array
      console.log('Removed from index is '+index+' result is '+JSON.stringify(result));
      array.splice(index, 1);

    }    
  });
}

And Finally the real answer of the question "Updating a JSON object using JS". In my example updating product quantity and total price on changing the "number" element value.

$(document).on('keyup mouseup','input[type=number]',function(){

  var arrayFromLocal=localStorage.getObj('product');
  setQuantityAndTotalPrice(arrayFromLocal,$(this).attr('updateItemid'),$(this).val());
  localStorage.setObj('product', arrayFromLocal);
  loadBasketFromLocalStorageAndRender();
});

function setQuantityAndTotalPrice(array,id,quantity) {

  array.forEach(function(result, index) {
    if(result.id === id) {
      result.quantity=quantity;
      result.total=(quantity*result.price);
    }    
  });

}

MySql server startup error 'The server quit without updating PID file '

Try this..

Navigate to the problem's parent directory cd YOURPATH/usr/local/mysql
rm -rf *.local.err (deletes file)
touch YOURUSERNAME.local.pid (generates new *.local.pid file the error thrown was complaining about)
cd back into your project and restart mysql using mysql.server start

jQuery: click function exclude children.

Or you can do also:

$('.example').on('click', function(e) { 
   if( e.target != this ) 
       return false;

   // ... //
});

How print out the contents of a HashMap<String, String> in ascending order based on its values?

 SmartPhone[] sp=new SmartPhone[4];
 sp[0]=new SmartPhone(1,"HTC","desire","black",20000,10,true,true);
 sp[1]=new SmartPhone(2,"samsung","grand","black",5000,10,false,true);
 sp[2]=new SmartPhone(14,"google nexus","desire","black",2000,30,true,false);
 sp[3]=new SmartPhone(13,"HTC","desire","white",50000,40,false,false);

Check play state of AVPlayer

In iOS10, there's a built in property for this now: timeControlStatus

For example, this function plays or pauses the avPlayer based on it's status and updates the play/pause button appropriately.

@IBAction func btnPlayPauseTap(_ sender: Any) {
    if aPlayer.timeControlStatus == .playing {
        aPlayer.pause()
        btnPlay.setImage(UIImage(named: "control-play"), for: .normal)
    } else if aPlayer.timeControlStatus == .paused {
        aPlayer.play()
        btnPlay.setImage(UIImage(named: "control-pause"), for: .normal)
    }
}

As for your second question, to know if the avPlayer reached the end, the easiest thing to do would be to set up a notification.

NotificationCenter.default.addObserver(self, selector: #selector(self.didPlayToEnd), name: .AVPlayerItemDidPlayToEndTime, object: nil)

When it gets to the end, for example, you can have it rewind to the beginning of the video and reset the Pause button to Play.

@objc func didPlayToEnd() {
    aPlayer.seek(to: CMTimeMakeWithSeconds(0, 1))
    btnPlay.setImage(UIImage(named: "control-play"), for: .normal)
}

These examples are useful if you're creating your own controls, but if you use a AVPlayerViewController, then the controls come built in.

Alternative to Intersect in MySQL

Break your problem in 2 statements: firstly, you want to select all if

(id=3 and cut_name= '?????' and cut_name='??')

is true . Secondly, you want to select all if

(id=3) and ( cut_name='?????' or cut_name='??')

is true. So, we will join both by OR because we want to select all if anyone of them is true.

select * from emovis_reporting
    where (id=3 and cut_name= '?????' and cut_name='??') OR
        ( (id=3) and ( cut_name='?????' or cut_name='??') )

Can't draw Histogram, 'x' must be numeric

Use the dec argument to set "," as the decimal point by adding:

 ce <- read.table("file.txt", header = TRUE, dec = ",")

What is the difference between concurrency and parallelism?

Concurrency: If two or more problems are solved by a single processor. alt text

Parallelism: If one problem is solved by multiple processors.

alt text

Setting up PostgreSQL ODBC on Windows

First you download ODBC driver psqlodbc_09_01_0200-x64.zip then you installed it.After that go to START->Program->Administrative tools then you select Data Source ODBC then you double click on the same after that you select PostgreSQL 30 then you select configure then you provide proper details such as db name user Id host name password of the same database in this way you will configured your DSN connection.After That you will check SSL should be allow .

Then you go on next tab system DSN then you select ADD tabthen select postgreSQL_ANSI_64X ODBC after you that you have created PostgreSQL ODBC connection.

Select all occurrences of selected word in VSCode

What if you want to select just a few?

No problem, first:

Ctrl+F find the letters by typing them
ESC to quit searching (you need to this even when using Ctrl+Shift+L to select all occurences)

just select those letters with your mouse or keyboard (Shift+arrows)

Now that the mouse cursor is blinking on your first selection, using a few more Key Bindings (thanks for the ref j08691) you may:

Ctrl+D select the next occurrence
Ctrl+K+Ctrl+D skip the next occurrence
Ctrl+U undo one of the above

Simulate a button click in Jest

Additionally to the solutions that were suggested in sibling comments, you may change your testing approach a little bit and test not the whole page all at once (with a deep children components tree), but do an isolated component testing. This will simplify testing of onClick() and similar events (see example below).

The idea is to test only one component at a time and not all of them together. In this case all children components will be mocked using the jest.mock() function.

Here is an example of how the onClick() event may be tested in an isolated SearchForm component using Jest and react-test-renderer.

import React from 'react';
import renderer from 'react-test-renderer';
import { SearchForm } from '../SearchForm';

describe('SearchForm', () => {
  it('should fire onSubmit form callback', () => {
    // Mock search form parameters.
    const searchQuery = 'kittens';
    const onSubmit = jest.fn();

    // Create test component instance.
    const testComponentInstance = renderer.create((
      <SearchForm query={searchQuery} onSearchSubmit={onSubmit} />
    )).root;

    // Try to find submit button inside the form.
    const submitButtonInstance = testComponentInstance.findByProps({
      type: 'submit',
    });
    expect(submitButtonInstance).toBeDefined();

    // Since we're not going to test the button component itself
    // we may just simulate its onClick event manually.
    const eventMock = { preventDefault: jest.fn() };
    submitButtonInstance.props.onClick(eventMock);

    expect(onSubmit).toHaveBeenCalledTimes(1);
    expect(onSubmit).toHaveBeenCalledWith(searchQuery);
  });
});

Java sending and receiving file (byte[]) over sockets

Here is the server Open a stream to the file and send it overnetwork

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class SimpleFileServer {

  public final static int SOCKET_PORT = 5501;
  public final static String FILE_TO_SEND = "file.txt";

  public static void main (String [] args ) throws IOException {
    FileInputStream fis = null;
    BufferedInputStream bis = null;
    OutputStream os = null;
    ServerSocket servsock = null;
    Socket sock = null;
    try {
      servsock = new ServerSocket(SOCKET_PORT);
      while (true) {
        System.out.println("Waiting...");
        try {
          sock = servsock.accept();
          System.out.println("Accepted connection : " + sock);
          // send file
          File myFile = new File (FILE_TO_SEND);
          byte [] mybytearray  = new byte [(int)myFile.length()];
          fis = new FileInputStream(myFile);
          bis = new BufferedInputStream(fis);
          bis.read(mybytearray,0,mybytearray.length);
          os = sock.getOutputStream();
          System.out.println("Sending " + FILE_TO_SEND + "(" + mybytearray.length + " bytes)");
          os.write(mybytearray,0,mybytearray.length);
          os.flush();
          System.out.println("Done.");
        } catch (IOException ex) {
          System.out.println(ex.getMessage()+": An Inbound Connection Was Not Resolved");
        }
        }finally {
          if (bis != null) bis.close();
          if (os != null) os.close();
          if (sock!=null) sock.close();
        }
      }
    }
    finally {
      if (servsock != null)
        servsock.close();
    }
  }
}

Here is the client Recive the file being sent overnetwork

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;

public class SimpleFileClient {

  public final static int SOCKET_PORT = 5501;
  public final static String SERVER = "127.0.0.1";
  public final static String
       FILE_TO_RECEIVED = "file-rec.txt";

  public final static int FILE_SIZE = Integer.MAX_VALUE;

  public static void main (String [] args ) throws IOException {
    int bytesRead;
    int current = 0;
    FileOutputStream fos = null;
    BufferedOutputStream bos = null;
    Socket sock = null;
    try {
      sock = new Socket(SERVER, SOCKET_PORT);
      System.out.println("Connecting...");

      // receive file
      byte [] mybytearray  = new byte [FILE_SIZE];
      InputStream is = sock.getInputStream();
      fos = new FileOutputStream(FILE_TO_RECEIVED);
      bos = new BufferedOutputStream(fos);
      bytesRead = is.read(mybytearray,0,mybytearray.length);
      current = bytesRead;

      do {
         bytesRead =
            is.read(mybytearray, current, (mybytearray.length-current));
         if(bytesRead >= 0) current += bytesRead;
      } while(bytesRead > -1);

      bos.write(mybytearray, 0 , current);
      bos.flush();
      System.out.println("File " + FILE_TO_RECEIVED
          + " downloaded (" + current + " bytes read)");
    }
    finally {
      if (fos != null) fos.close();
      if (bos != null) bos.close();
      if (sock != null) sock.close();
    }
  }    
}

How do I programmatically set device orientation in iOS 7?

The base UINavigationController should have the below callback so that the child items can decide what orientation they want.

-(NSUInteger)supportedInterfaceOrientations {
    UIViewController *topVC = self.topViewController;
    return topVC.supportedInterfaceOrientations;
}

-(BOOL)shouldAutorotate {
   UIViewController *topVC = self.topViewController;
   return [topVC shouldAutorotate];
}

Inserting a string into a list without getting split into characters

ls=['hello','world']
ls.append('python')
['hello', 'world', 'python']

or (use insert function where you can use index position in list)

ls.insert(0,'python')
print(ls)
['python', 'hello', 'world']

Auto-Submit Form using JavaScript

A simple solution for a delayed auto submit:

<body onload="setTimeout(function() { document.frm1.submit() }, 5000)">
   <form action="https://www.google.com" name="frm1">
      <input type="hidden" name="q" value="Hello world" />
   </form>
</body>

convert ArrayList<MyCustomClass> to JSONArray

I know its already answered, but theres a better solution here use this code :

for ( Field f : context.getFields() ) {
     if ( f.getType() == String.class ) || ( f.getType() == String.class ) ) {
           //DO String To JSON
     }
     /// And so on...
}

This way you can access variables from class without manually typing them..

Faster and better .. Hope this helps.

Cheers. :D

What is causing the error `string.split is not a function`?

maybe

string = document.location.href;
arrayOfStrings = string.toString().split('/');

assuming you want the current url

How to properly override clone method?

As much as the most of the answers here are valid, I need to tell that your solution is also how the actual Java API developers do it. (Either Josh Bloch or Neal Gafter)

Here is an extract from openJDK, ArrayList class:

public Object clone() {
    try {
        ArrayList<?> v = (ArrayList<?>) super.clone();
        v.elementData = Arrays.copyOf(elementData, size);
        v.modCount = 0;
        return v;
    } catch (CloneNotSupportedException e) {
        // this shouldn't happen, since we are Cloneable
        throw new InternalError(e);
    }
}

As you have noticed and others mentioned, CloneNotSupportedException has almost no chance to be thrown if you declared that you implement the Cloneable interface.

Also, there is no need for you to override the method if you don't do anything new in the overridden method. You only need to override it when you need to do extra operations on the object or you need to make it public.

Ultimately, it is still best to avoid it and do it using some other way.

Vuejs: Event on route change

Another solution for typescript user:

import Vue from "vue";
import Component from "vue-class-component";

@Component({
  beforeRouteLeave(to, from, next) {
    // incase if you want to access `this`
    // const self = this as any;
    next();
  }
})

export default class ComponentName extends Vue {}

Command to open file with git

Git has nothing to do with how you open/edit files in your project. Configuring the editor in git is only so that git internal things that require an editor (commit messages for example) can use your preferred editor.

If you just want to open files from the command line (cmd.exe) as if they were double clicked in the windows explorer, I think you can use start <filename>.

Reading a List from properties file and load with spring annotation @Value

Consider using Commons Configuration. It have built in feature to break an entry in properties file to array/list. Combing with SpEL and @Value should give what you want

As requested, here is what you need (Haven't really tried the code, may got some typoes, please bear with me):

In Apache Commons Configuration, there is PropertiesConfiguration. It supports the feature of converting delimited string to array/list.

For example, if you have a properties file

#Foo.properties
foo=bar1, bar2, bar3

With the below code:

PropertiesConfiguration config = new PropertiesConfiguration("Foo.properties");
String[] values = config.getStringArray("foo");

will give you a string array of ["bar1", "bar2", "bar3"]

To use with Spring, have this in your app context xml:

<bean id="fooConfig" class="org.apache.commons.configuration.PropertiesConfiguration">
    <constructor-arg type="java.lang.String" value="classpath:/Foo.properties"/>
</bean>

and have this in your spring bean:

public class SomeBean {

    @Value("fooConfig.getStringArray('foo')")
    private String[] fooArray;
}

I believe this should work :P

How to sort an array of ints using a custom comparator?

How about using streams (Java 8)?

int[] ia = {99, 11, 7, 21, 4, 2};
ia = Arrays.stream(ia).
    boxed().
    sorted((a, b) -> b.compareTo(a)). // sort descending
    mapToInt(i -> i).
    toArray();

Or in-place:

int[] ia = {99, 11, 7, 21, 4, 2};
System.arraycopy(
        Arrays.stream(ia).
            boxed().
            sorted((a, b) -> b.compareTo(a)). // sort descending
            mapToInt(i -> i).
            toArray(),
        0,
        ia,
        0,
        ia.length
    );

MySQL ORDER BY multiple column ASC and DESC

@DRapp is a genius. I never understood how he coded his SQL,so I tried coding it in my own understanding.


    SELECT 
      f.username,
      f.point,
      f.avg_time
    FROM
      (
      SELECT
        userscores.username,
        userscores.point,
        userscores.avg_time
      FROM
        (
        SELECT
          users.username,
          scores.point,
          scores.avg_time
        FROM
          scores
        JOIN users
        ON scores.user_id = users.id
        ORDER BY scores.point DESC
        ) userscores
      ORDER BY
        point DESC,
        avg_time
      ) f
    GROUP BY f.username
    ORDER BY point DESC

It yields the same result by using GROUP BY instead of the user @variables.

Hibernate Union alternatives

I too have been through this pain - if the query is dynamically generated (e.g. Hibernate Criteria) then I couldn't find a practical way to do it.

The good news for me was that I was only investigating union to solve a performance problem when using an 'or' in an Oracle database.

The solution Patrick posted (combining the results programmatically using a set) while ugly (especially since I wanted to do results paging as well) was adequate for me.

How do I check if an HTML element is empty using jQuery?

document.getElementById("id").innerHTML == "" || null

$("element").html() == "" || null

Converting cv::Mat to IplImage*

Mat image1;
IplImage* image2=cvCloneImage(&(IplImage)image1);

Guess this will do the job.

Edit: If you face compilation errors, try this way:

cv::Mat image1;
IplImage* image2;
image2 = cvCreateImage(cvSize(image1.cols,image1.rows),8,3);
IplImage ipltemp=image1;
cvCopy(&ipltemp,image2);

php: Get html source code with cURL

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);

Source: http://www.christianschenk.org/blog/php-curl-allow-url-fopen/

Redirecting new tab on button click.(Response.Redirect) in asp.net C#

You have to add following in header:

<script type="text/javascript">
        function fixform() {
            if (opener.document.getElementById("aspnetForm").target != "_blank") return;

            opener.document.getElementById("aspnetForm").target = "";
            opener.document.getElementById("aspnetForm").action = opener.location.href;
            }
</script>

Then call fixform() in load your page.

jQuery - determine if input element is textbox or select list

If you just want to check the type, you can use jQuery's .is() function,

Like in my case I used below,

if($("#id").is("select")) {
 alert('Select'); 
else if($("#id").is("input")) {
 alert("input");
}

Run a single test method with maven

Running a set of methods in a Single Test Class With version 2.7.3, you can run only n tests in a single Test Class.

NOTE : it's supported for junit 4.x and TestNG.

You must use the following syntax

mvn -Dtest=TestCircle#mytest test

You can use patterns too

mvn -Dtest=TestCircle#test* test

As of surefire 2.12.1, you can select multiple methods (JUnit4X only at this time, patches welcome)

mvn -Dtest=TestCircle#testOne+testTwo test

Check this link about single tests

What does 'index 0 is out of bounds for axis 0 with size 0' mean?

In numpy, index and dimension numbering starts with 0. So axis 0 means the 1st dimension. Also in numpy a dimension can have length (size) 0. The simplest case is:

In [435]: x = np.zeros((0,), int)
In [436]: x
Out[436]: array([], dtype=int32)
In [437]: x[0]
...
IndexError: index 0 is out of bounds for axis 0 with size 0

I also get it if x = np.zeros((0,5), int), a 2d array with 0 rows, and 5 columns.

So someplace in your code you are creating an array with a size 0 first axis.

When asking about errors, it is expected that you tell us where the error occurs.

Also when debugging problems like this, the first thing you should do is print the shape (and maybe the dtype) of the suspected variables.

Applied to `pandas`

The same error can occur for those using pandas, when sending a Series or DataFrame to a numpy.array, as with the following:
- pandas.Series.values or pandas.Series.to_numpy() or pandas.Series.array
- pandas.DataFrame.values or pandas.DataFrame.to_numpy()

Resolving the error:

Use a try-except block
Verify the size of the array is not 0
- if x.size != 0:

Get output parameter value in ADO.NET

For anyone looking to do something similar using a reader with the stored procedure, note that the reader must be closed to retrieve the output value.

using (SqlConnection conn = new SqlConnection())
{
    SqlCommand cmd = new SqlCommand("sproc", conn);
    cmd.CommandType = CommandType.StoredProcedure;

    // add parameters
    SqlParameter outputParam = cmd.Parameters.Add("@ID", SqlDbType.Int);
    outputParam.Direction = ParameterDirection.Output;

    conn.Open();

    using(IDataReader reader = cmd.ExecuteReader())
    {
        while(reader.Read())
        {
            //read in data
        }
    }
    // reader is closed/disposed after exiting the using statement
    int id = outputParam.Value;
}

How to install 2 Anacondas (Python 2 and 3) on Mac OS

Edit!: Please be sure that you should have both Python installed on your computer.

Maybe my answer is late for you but I can help someone who has the same problem!

You don't have to download both Anaconda.

If you are using Spyder and Jupyter in Anaconda environmen and,

If you have already Anaconda 2 type in Terminal:

    python3 -m pip install ipykernel

    python3 -m ipykernel install --user

If you have already Anaconda 3 then type in terminal:

    python2 -m pip install ipykernel

    python2 -m ipykernel install --user

Then before use Spyder you can choose Python environment like below! Sometimes only you can see root and your new Python environment, so root is your first anaconda environment!

Anaconda spyder Python 2.7 or 3.5

Also this is Jupyter. You can choose python version like this!

Jupyter Notebook

I hope it will help.

MySQL GROUP BY two columns

First, let's make some test data:

create table client (client_id integer not null primary key auto_increment,
                     name varchar(64));
create table portfolio (portfolio_id integer not null primary key auto_increment,
                        client_id integer references client.id,
                        cash decimal(10,2),
                        stocks decimal(10,2));
insert into client (name) values ('John Doe'), ('Jane Doe');
insert into portfolio (client_id, cash, stocks) values (1, 11.11, 22.22),
                                                       (1, 10.11, 23.22),
                                                       (2, 30.30, 40.40),
                                                       (2, 40.40, 50.50);

If you didn't need the portfolio ID, it would be easy:

select client_id, name, max(cash + stocks)
from client join portfolio using (client_id)
group by client_id

+-----------+----------+--------------------+
| client_id | name     | max(cash + stocks) |
+-----------+----------+--------------------+
|         1 | John Doe |              33.33 | 
|         2 | Jane Doe |              90.90 | 
+-----------+----------+--------------------+

Since you need the portfolio ID, things get more complicated. Let's do it in steps. First, we'll write a subquery that returns the maximal portfolio value for each client:

select client_id, max(cash + stocks) as maxtotal
from portfolio
group by client_id

+-----------+----------+
| client_id | maxtotal |
+-----------+----------+
|         1 |    33.33 | 
|         2 |    90.90 | 
+-----------+----------+

Then we'll query the portfolio table, but use a join to the previous subquery in order to keep only those portfolios the total value of which is the maximal for the client:

 select portfolio_id, cash + stocks from portfolio 
 join (select client_id, max(cash + stocks) as maxtotal 
       from portfolio
       group by client_id) as maxima
 using (client_id)
 where cash + stocks = maxtotal

+--------------+---------------+
| portfolio_id | cash + stocks |
+--------------+---------------+
|            5 |         33.33 | 
|            6 |         33.33 | 
|            8 |         90.90 | 
+--------------+---------------+

Finally, we can join to the client table (as you did) in order to include the name of each client:

select client_id, name, portfolio_id, cash + stocks
from client
join portfolio using (client_id)
join (select client_id, max(cash + stocks) as maxtotal
      from portfolio 
      group by client_id) as maxima
using (client_id)
where cash + stocks = maxtotal

+-----------+----------+--------------+---------------+
| client_id | name     | portfolio_id | cash + stocks |
+-----------+----------+--------------+---------------+
|         1 | John Doe |            5 |         33.33 | 
|         1 | John Doe |            6 |         33.33 | 
|         2 | Jane Doe |            8 |         90.90 | 
+-----------+----------+--------------+---------------+

Note that this returns two rows for John Doe because he has two portfolios with the exact same total value. To avoid this and pick an arbitrary top portfolio, tag on a GROUP BY clause:

select client_id, name, portfolio_id, cash + stocks
from client
join portfolio using (client_id)
join (select client_id, max(cash + stocks) as maxtotal
      from portfolio 
      group by client_id) as maxima
using (client_id)
where cash + stocks = maxtotal
group by client_id, cash + stocks

+-----------+----------+--------------+---------------+
| client_id | name     | portfolio_id | cash + stocks |
+-----------+----------+--------------+---------------+
|         1 | John Doe |            5 |         33.33 | 
|         2 | Jane Doe |            8 |         90.90 | 
+-----------+----------+--------------+---------------+

How to create a windows service from java app

I've had some luck with the Java Service Wrapper

Pdf.js: rendering a pdf file using a base64 file source instead of url

from the sourcecode at http://mozilla.github.com/pdf.js/build/pdf.js

/**
 * This is the main entry point for loading a PDF and interacting with it.
 * NOTE: If a URL is used to fetch the PDF data a standard XMLHttpRequest(XHR)
 * is used, which means it must follow the same origin rules that any XHR does
 * e.g. No cross domain requests without CORS.
 *
 * @param {string|TypedAray|object} source Can be an url to where a PDF is
 * located, a typed array (Uint8Array) already populated with data or
 * and parameter object with the following possible fields:
 *  - url   - The URL of the PDF.
 *  - data  - A typed array with PDF data.
 *  - httpHeaders - Basic authentication headers.
 *  - password - For decrypting password-protected PDFs.
 *
 * @return {Promise} A promise that is resolved with {PDFDocumentProxy} object.
 */

So a standard XMLHttpRequest(XHR) is used for retrieving the document. The Problem with this is that XMLHttpRequests do not support data: uris (eg. data:application/pdf;base64,JVBERi0xLjUK...).

But there is the possibility of passing a typed Javascript Array to the function. The only thing you need to do is to convert the base64 string to a Uint8Array. You can use this function found at https://gist.github.com/1032746

var BASE64_MARKER = ';base64,';

function convertDataURIToBinary(dataURI) {
  var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;
  var base64 = dataURI.substring(base64Index);
  var raw = window.atob(base64);
  var rawLength = raw.length;
  var array = new Uint8Array(new ArrayBuffer(rawLength));

  for(var i = 0; i < rawLength; i++) {
    array[i] = raw.charCodeAt(i);
  }
  return array;
}

tl;dr

var pdfAsDataUri = "data:application/pdf;base64,JVBERi0xLjUK..."; // shortened
var pdfAsArray = convertDataURIToBinary(pdfAsDataUri);
PDFJS.getDocument(pdfAsArray)

Decimal number regular expression, where digit after decimal is optional

In Perl, use Regexp::Common which will allow you to assemble a finely-tuned regular expression for your particular number format. If you are not using Perl, the generated regular expression can still typically be used by other languages.

Printing the result of generating the example regular expressions in Regexp::Common::Number:

$ perl -MRegexp::Common=number -E 'say $RE{num}{int}'
(?:(?:[-+]?)(?:[0123456789]+))

$ perl -MRegexp::Common=number -E 'say $RE{num}{real}'
(?:(?i)(?:[-+]?)(?:(?=[.]?[0123456789])(?:[0123456789]*)(?:(?:[.])(?:[0123456789]{0,}))?)(?:(?:[E])(?:(?:[-+]?)(?:[0123456789]+))|))

$ perl -MRegexp::Common=number -E 'say $RE{num}{real}{-base=>16}'
(?:(?i)(?:[-+]?)(?:(?=[.]?[0123456789ABCDEF])(?:[0123456789ABCDEF]*)(?:(?:[.])(?:[0123456789ABCDEF]{0,}))?)(?:(?:[G])(?:(?:[-+]?)(?:[0123456789ABCDEF]+))|))

What is an 'undeclared identifier' error and how do I fix it?

It happened to me when the auto formatter in a visual studio project sorted my includes after which the pre compiled header was not the first include anymore.

In other words. If you have any of these:

#include "pch.h"

#include <stdio.h>

#include <iostream>
#include "stdafx.h"

Put it at the start of your file.

If your clang formatter is sorting the files automatically, try putting an enter after the pre compiled header. If it is on IBS_Preserve it will sort each #include block separately.

#include "pch.h"  // must be first

#include "bar.h"  // next block
#include "baz.h"
#include "foo.h"

More info at Compiler Error C2065

Telling Python to save a .txt file to a certain directory on Windows and Mac

Use os.path.join to combine the path to the Documents directory with the completeName (filename?) supplied by the user.

import os
with open(os.path.join('/path/to/Documents',completeName), "w") as file1:
    toFile = raw_input("Write what you want into the field")
    file1.write(toFile)

If you want the Documents directory to be relative to the user's home directory, you could use something like:

os.path.join(os.path.expanduser('~'),'Documents',completeName)

Others have proposed using os.path.abspath. Note that os.path.abspath does not resolve '~' to the user's home directory:

In [10]: cd /tmp
/tmp

In [11]: os.path.abspath("~")
Out[11]: '/tmp/~'

How to get current date & time in MySQL?

You can use NOW():

INSERT INTO servers (server_name, online_status, exchange, disk_space, network_shares, c_time)
VALUES('m1', 'ONLINE', 'exchange', 'disk_space', 'network_shares', NOW())

Get the contents of a table row with a button click

Try this:

$(".use-address").click(function() {
   $(this).closest('tr').find('td').each(function() {
        var textval = $(this).text(); // this will be the text of each <td>
   });
});

This will find the closest tr (going up through the DOM) of the currently clicked button and then loop each td - you might want to create a string / array with the values.

Example here

Getting the full address using an array example here

CodeIgniter - How to return Json response from controller

This is not your answer and this is an alternate way to process the form submission

$('.signinform').click(function(e) { 
      e.preventDefault();
      $.ajax({
      type: "POST",
      url: 'index.php/user/signin', // target element(s) to be updated with server response 
      dataType:'json',
      success : function(response){ console.log(response); alert(response)}
     });
});

Difference between const reference and normal parameter

The important difference is that when passing by const reference, no new object is created. In the function body, the parameter is effectively an alias for the object passed in.

Because the reference is a const reference the function body cannot directly change the value of that object. This has a similar property to passing by value where the function body also cannot change the value of the object that was passed in, in this case because the parameter is a copy.

There are crucial differences. If the parameter is a const reference, but the object passed it was not in fact const then the value of the object may be changed during the function call itself.

E.g.

int a;

void DoWork(const int &n)
{
    a = n * 2;  // If n was a reference to a, n will have been doubled 

    f();  // Might change the value of whatever n refers to 
}

int main()
{
    DoWork(a);
}

Also if the object passed in was not actually const then the function could (even if it is ill advised) change its value with a cast.

e.g.

void DoWork(const int &n)
{
    const_cast<int&>(n) = 22;
}

This would cause undefined behaviour if the object passed in was actually const.

When the parameter is passed by const reference, extra costs include dereferencing, worse object locality, fewer opportunities for compile optimizing.

When the parameter is passed by value and extra cost is the need to create a parameter copy. Typically this is only of concern when the object type is large.

Using number_format method in Laravel

If you are using Eloquent, in your model put:

public function getPriceAttribute($price)
{
    return $this->attributes['price'] = sprintf('U$ %s', number_format($price, 2));
}

Where getPriceAttribute is your field on database. getSomethingAttribute.

TypeScript add Object to array with push

class PushObjects {
    testMethod(): Array<number> { 
        //declaration and initialisation of array onject
        var objs: number[] = [1,2,3,4,5,7];
        //push the elements into the array object
        objs.push(100);
        //pop the elements from the array
        objs.pop();
        return objs;
    }   
}

let pushObj = new PushObjects();
//create the button element from the dom object 
let btn = document.createElement('button');
//set the text value of the button
btn.textContent = "Click here";
//button click event
btn.onclick = function () { 

    alert(pushObj.testMethod());

} 

document.body.appendChild(btn);

JSON encode MySQL results

$sth = mysqli_query($conn, "SELECT ...");
$rows = array();
while($r = mysqli_fetch_assoc($sth)) {
    $rows[] = $r;
}
print json_encode($rows);

The function json_encode needs PHP >= 5.2 and the php-json package - as mentioned here

NOTE: mysql is deprecated as of PHP 5.5.0, use mysqli extension instead http://php.net/manual/en/migration55.deprecated.php.

slideToggle JQuery right to left

You can do this using additional effects as a part of jQuery-ui

$('.show_hide').click(function () {
    $(".slidingDiv").toggle("slide");
});

Test Link

"The Controls collection cannot be modified because the control contains code blocks"

I had the same issue with different circumstances.
I had simple element inside the body tag.
The solution was:

<asp:PlaceHolder ID="container" runat="server">
    <a id="child" href="<%# variable %>">Change me</a>
</asp:PlaceHolder>

protected new void Page_Load(object sender, EventArgs e)
{    
    Page.Form.DataBind(); // I neded to Call DataBind on Form not on Header
    container.InnerHtml = "Simple text";
}

Setting the classpath in java using Eclipse IDE

You can create new User library,

"Configure Build Paths" page -> Add Library -> User Library (on list) -> User Libraries Button (rigth side of page)

and create your library and (add Jars buttons) include your specific Jars.

I hope this can help you.

Download a file from HTTPS using download.file()

Here's an update as of Nov 2014. I find that setting method='curl' did the trick for me (while method='auto', does not).

For example:

# does not work
download.file(url='https://s3.amazonaws.com/tripdata/201307-citibike-tripdata.zip',
              destfile='localfile.zip')

# does not work. this appears to be the default anyway
download.file(url='https://s3.amazonaws.com/tripdata/201307-citibike-tripdata.zip',
              destfile='localfile.zip', method='auto')

# works!
download.file(url='https://s3.amazonaws.com/tripdata/201307-citibike-tripdata.zip',
              destfile='localfile.zip', method='curl')

NameError: name 'datetime' is not defined

It can also be used as below:

from datetime import datetime
start_date = datetime(2016,3,1)
end_date = datetime(2016,3,10)

How to convert date to timestamp in PHP?

function date_to_stamp( $date, $slash_time = true, $timezone = 'Europe/London', $expression = "#^\d{2}([^\d]*)\d{2}([^\d]*)\d{4}$#is" ) {
    $return = false;
    $_timezone = date_default_timezone_get();
    date_default_timezone_set( $timezone );
    if( preg_match( $expression, $date, $matches ) )
        $return = date( "Y-m-d " . ( $slash_time ? '00:00:00' : "h:i:s" ), strtotime( str_replace( array($matches[1], $matches[2]), '-', $date ) . ' ' . date("h:i:s") ) );
    date_default_timezone_set( $_timezone );
    return $return;
}

// expression may need changing in relation to timezone
echo date_to_stamp('19/03/1986', false) . '<br />';
echo date_to_stamp('19**03**1986', false) . '<br />';
echo date_to_stamp('19.03.1986') . '<br />';
echo date_to_stamp('19.03.1986', false, 'Asia/Aden') . '<br />';
echo date('Y-m-d h:i:s') . '<br />';

//1986-03-19 02:37:30
//1986-03-19 02:37:30
//1986-03-19 00:00:00
//1986-03-19 05:37:30
//2012-02-12 02:37:30

How do I create documentation with Pydoc?

pydoc is fantastic for generating documentation, but the documentation has to be written in the first place. You must have docstrings in your source code as was mentioned by RocketDonkey in the comments:

"""
This example module shows various types of documentation available for use
with pydoc.  To generate HTML documentation for this module issue the
command:

    pydoc -w foo

"""

class Foo(object):
    """
    Foo encapsulates a name and an age.
    """
    def __init__(self, name, age):
        """
        Construct a new 'Foo' object.

        :param name: The name of foo
        :param age: The ageof foo
        :return: returns nothing
        """
        self.name = name
        self.age = age

def bar(baz):
    """
    Prints baz to the display.
    """
    print baz

if __name__ == '__main__':
    f = Foo('John Doe', 42)
    bar("hello world")

The first docstring provides instructions for creating the documentation with pydoc. There are examples of different types of docstrings so you can see how they look when generated with pydoc.

Submit a form using jQuery

Note that if you already installed a submit event listener for your form, the innner call to submit()

jQuery('#<form-id>').submit( function(e){ 
    e.preventDefault();
    // maybe some validation in here
    if ( <form-is-valid> ) jQuery('#<form-id>').submit();
});

won't work as it tries to install a new event listener for this form's submit event (which fails). So you have to acces the HTML Element itself (unwrap from jQquery) and call submit() on this element directly:

    jQuery('#<form-id>').submit( function(e){ 
      e.preventDefault();
      // note the [0] array access:
      if ( <form-is-valid> ) jQuery('#<form-id>')[0].submit();
    });

How to access the last value in a vector?

If you're looking for something as nice as Python's x[-1] notation, I think you're out of luck. The standard idiom is

x[length(x)]

but it's easy enough to write a function to do this:

last <- function(x) { return( x[length(x)] ) }

This missing feature in R annoys me too!

WPF ListView - detect when selected item is clicked

Use the ListView.ItemContainerStyle property to give your ListViewItems an EventSetter that will handle the PreviewMouseLeftButtonDown event. Then, in the handler, check to see if the item that was clicked is selected.

XAML:

<ListView ItemsSource={Binding MyItems}>
    <ListView.View>
        <GridView>
            <!-- declare a GridViewColumn for each property -->
        </GridView>
    </ListView.View>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="ListViewItem_PreviewMouseLeftButtonDown" />
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

Code-behind:

private void ListViewItem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var item = sender as ListViewItem;
    if (item != null && item.IsSelected)
    {
        //Do your stuff
    }
}

Where in memory are my variables stored in C?

Variables/automatic variables ---> stack section
Dynamically allocated variables ---> heap section
Initialised global variables -> data section
Uninitialised global variables -> data section (bss)
Static variables -> data section
String constants -> text section/code section
Functions -> text section/code section
Text code -> text section/code section
Registers -> CPU registers
Command line inputs -> environmental/command line section
Environmental variables -> environmental/command line section

Difference between static class and singleton pattern?

I'll try to rise above the WTMI and WTL;DR responses.

Singletons are an instance of an object... full stop

Your question is fundamentally asking about the difference between a class an an instance of that class. I think that's pretty clear and requires no elaboration.

The singleton's class generally takes steps to ensure construction of one instance; that's smart but it's not required.

Example: var connection = Connection.Instance;

Say this is the Connection class:

public sealed class Connection 
{
    static readonly Connection _instance = new Connection();

    private Connection() 
    {
    }

    public static Connection Instance
    {
        get
        {
           return _instance;
        }
    } 
}

Note that you can throw an interface on that class and mock it for testing purposes, something you cannot easily do with a static class.

Compare two objects with .equals() and == operator

== compares object references, it checks to see if the two operands point to the same object (not equivalent objects, the same object).

If you want to compare strings (to see if they contain the same characters), you need to compare the strings using equals.

In your case, if two instances of MyClass really are considered equal if the strings match, then:

public boolean equals(Object object2) {
    return object2 instanceof MyClass && a.equals(((MyClass)object2).a);
}

...but usually if you are defining a class, there's more to equivalency than the equivalency of a single field (a in this case).

Side note: If you override equals, you almost always need to override hashCode. As it says in the equals JavaDoc:

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

android: how to align image in the horizontal center of an imageview?

For me android:gravity="center" did the trick in the parent layout element.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/fullImageView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:contentDescription="@string/fullImageView"
        android:layout_gravity="center" />

</LinearLayout>

Python return list from function

Sharing a URL with a query string on Twitter

Doesn't get simpler than this:

<a href="https://twitter.com/intent/tweet?text=optional%20promo%20text%20http://example.com/foo.htm?bar=123&baz=456" target="_blank">Tweet</a>

What is the best way to concatenate two vectors?

All the solutions are correct, but I found it easier just write a function to implement this. like this:

template <class T1, class T2>
void ContainerInsert(T1 t1, T2 t2)
{
    t1->insert(t1->end(), t2->begin(), t2->end());
}

That way you can avoid the temporary placement like this:

ContainerInsert(vec, GetSomeVector());

Build fails with "Command failed with a nonzero exit code"

The targets should be specified with related data such as appicon

Adding hours to JavaScript Date object?

A little messy, but it works!

Given a date format like this: 2019-04-03T15:58

  //Get the start date.
  var start = $("#start_date").val();
  //Split the date and time.
  var startarray = start.split("T");
  var date = startarray[0];
  var time = startarray[1];

  //Split the hours and minutes.
  var timearray = time.split(":");

  var hour = timearray[0];
  var minute = timearray[1];
  //Add an hour to the hour.
  hour++;
  //$("#end_date").val = start;
  $("#end_date").val(""+date+"T"+hour+":"+minute+"");

Your output would be: 2019-04-03T16:58

Gson: Directly convert String to JsonObject (no POJO)

com.google.gson.JsonParser#parse(java.lang.String) is now deprecated

so use com.google.gson.JsonParser#parseString, it works pretty well

Kotlin Example:

val mJsonObject = JsonParser.parseString(myStringJsonbject).asJsonObject

Java Example:

JsonObject mJsonObject = JsonParser.parseString(myStringJsonbject).getAsJsonObject();

How to set the font size in Emacs?

Aquamacs:

(set-face-attribute 'default nil :font "Monaco-16" )

From the Emacs Wiki Globally Change the Default Font, it says you can use either of these:

(set-face-attribute 'default nil :font FONT )

(set-frame-font FONT nil t)

Where FONT is something like "Monaco-16", e.g.:

(set-face-attribute 'default nil :font "Monaco-16" )

There was an extra closing parenthesis in the first suggestion on the wiki, which caused an error on startup. I finally noticed the extra closing parenthesis, and I subsequently corrected the suggestion on the wiki. Then both of the suggestions worked for me.

How to disable a input in angular2

I think I figured out the problem, this input field is part of a reactive form (?), since you have included formControlName. This means that what you are trying to do by disabling the input field with is_edit is not working, e.g your attempt [disabled]="is_edit", which would in other cases work. With your form you need to do something like this:

toggle() {
  let control = this.myForm.get('name')
  control.disabled ? control.enable() : control.disable();
}

and lose the is_edit altogether.

if you want the input field to be disabled as default, you need to set the form control as:

name: [{value: '', disabled:true}]

Here's a plunker

How to solve the system.data.sqlclient.sqlexception (0x80131904) error

The datasource is by default .\SQLEXPRESS (its the instance where databases are placed by default) or if u changed the name of the instance during installation of sql server so i advise you to do this :

connectionString="Data Source=.\\yourInstance(defaulT Data source is SQLEXPRESS);
       Initial Catalog=databaseName;
       User ID=theuser if u use it;
       Password=thepassword if u use it;
       integrated security=true(if u don t use user and pass; else change it false)"

Without to knowing your instance, I could help with this one. Hope it helped

Flask SQLAlchemy query, specify column names

You can use Query.values, Query.values

session.query(SomeModel).values('id', 'user')

Javascript Get Element by Id and set the value

For each element type, you can use specific attribute to set value. E.g.:

<div id="theValue1"></div>
window.document.getElementById("theValue1").innerText = "value div";

<input id="theValue2"></input>
window.document.getElementById("theValue2").value = "value input";

You can try example here!

Bash script - variable content as a command to run

Your are probably looking for eval $var.

Memcached vs. Redis?

Another bonus is that it can be very clear how memcache is going to behave in a caching scenario, while redis is generally used as a persistent datastore, though it can be configured to behave just like memcached aka evicting Least Recently Used items when it reaches max capacity.

Some apps I've worked on use both just to make it clear how we intend the data to behave - stuff in memcache, we write code to handle the cases where it isn't there - stuff in redis, we rely on it being there.

Other than that Redis is generally regarded as superior for most use cases being more feature-rich and thus flexible.

python time + timedelta equivalent

The solution is in the link that you provided in your question:

datetime.combine(date.today(), time()) + timedelta(hours=1)

Full example:

from datetime import date, datetime, time, timedelta

dt = datetime.combine(date.today(), time(23, 55)) + timedelta(minutes=30)
print dt.time()

Output:

00:25:00

Find if a String is present in an array

This is what you're looking for:

List<String> dan = Arrays.asList("Red", "Orange", "Yellow", "Green", "Blue", "Violet", "Orange", "Blue");

boolean contains = dan.contains(say.getText());

If you have a list of not repeated values, prefer using a Set<String> which has the same contains method

AngularJS : Difference between the $observe and $watch methods

If I understand your question right you are asking what is difference if you register listener callback with $watch or if you do it with $observe.

Callback registerd with $watch is fired when $digest is executed.

Callback registered with $observe are called when value changes of attributes that contain interpolation (e.g. attr="{{notJetInterpolated}}").

Inside directive you can use both of them on very similar way:

    attrs.$observe('attrYouWatch', function() {
         // body
    });

    scope.$watch(attrs['attrYouWatch'], function() {
         // body
    });

check if a file is open in Python

You could use with open("path") as file: so that it automatically closes, else if it's open in another process you can maybe try as in Tims example you should use except IOError to not ignore any other problem with your code :)

try:
   with open("path", "r") as file: # or just open
       # Code here
except IOError:
   # raise error or print

How to sum up an array of integers in C#

Provided that you can use .NET 3.5 (or newer) and LINQ, try

int sum = arr.Sum();

How to show Error & Warning Message Box in .NET/ How to Customize MessageBox

Try details: use any option..

    MessageBox.Show("your message",
    "window title", 
    MessageBoxButtons.OK, 
    MessageBoxIcon.Warning // for Warning  
    //MessageBoxIcon.Error // for Error 
    //MessageBoxIcon.Information  // for Information
    //MessageBoxIcon.Question // for Question
   );

How do I create a comma delimited string from an ArrayList?

Yes, I'm answering my own question, but I haven't found it here yet and thought this was a rather slick thing:

...in VB.NET:

String.Join(",", CType(TargetArrayList.ToArray(Type.GetType("System.String")), String()))

...in C#

string.Join(",", (string[])TargetArrayList.ToArray(Type.GetType("System.String")))

The only "gotcha" to these is that the ArrayList must have the items stored as Strings if you're using Option Strict to make sure the conversion takes place properly.

EDIT: If you're using .net 2.0 or above, simply create a List(Of String) type object and you can get what you need with. Many thanks to Joel for bringing this up!

String.Join(",", TargetList.ToArray())

Complex JSON nesting of objects and arrays

Make sure you follow the language definition for JSON. In your second example, the section:

"labs":[{
    ""
}]

Is invalid since an object must be composed of zero or more key-value pairs "a" : "b", where "b" may be any valid value. Some parsers may automatically interpret { "" } to be { "" : null }, but this is not a clearly defined case.

Also, you are using a nested array of objects [{}] quite a bit. I would only do this if:

There is no good "identifier" string for each object in the array.
There is some clear reason for having an array over a key-value for that entry.

open a url on click of ok button in android

String url = "https://www.murait.com/";
if (url.startsWith("https://") || url.startsWith("http://")) {
    Uri uri = Uri.parse(url);
    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
    startActivity(intent);
}else{
    Toast.makeText(mContext, "Invalid Url", Toast.LENGTH_SHORT).show();
}

You have to check that the URL is valid or not. If URL is invalid application may crash so that you have to check URL is valid or not by this method.

Cocoa Autolayout: content hugging vs content compression resistance priority

Content Hugging and Content Compression Resistence Priorities work for elements which can calculate their size intrinsically depending upon the contents which are coming in.

From Apple docs:

File count from a folder

System.IO.Directory myDir = GetMyDirectoryForTheExample();
int count = myDir.GetFiles().Length;

jquery onclick change css background image

You need to use background-image instead of backgroundImage. For example:

$(function() {
  $('.home').click(function() {
    $(this).css('background-image', 'url(images/tabs3.png)');
  });
}):

How to create materialized views in SQL Server?

For MS T-SQL Server, I suggest looking into creating an index with the "include" statement. Uniqueness is not required, neither is the physical sorting of data associated with a clustered index. The "Index ... Include ()" creates a separate physical data storage automatically maintained by the system. It is conceptually very similar to an Oracle Materialized View.

https://msdn.microsoft.com/en-us/library/ms190806.aspx

https://technet.microsoft.com/en-us/library/ms189607(v=sql.105).aspx

pandas dataframe convert column type to string or categorical

With pandas >= 1.0 there is now a dedicated string datatype:

1) You can convert your column to this pandas string datatype using .astype('string'):

df['zipcode'] = df['zipcode'].astype('string')

2) This is different from using str which sets the pandas object datatype:

df['zipcode'] = df['zipcode'].astype(str)

3) For changing into categorical datatype use:

df['zipcode'] = df['zipcode'].astype('category')

You can see this difference in datatypes when you look at the info of the dataframe:

df = pd.DataFrame({
    'zipcode_str': [90210, 90211] ,
    'zipcode_string': [90210, 90211],
    'zipcode_category': [90210, 90211],
})

df['zipcode_str'] = df['zipcode_str'].astype(str)
df['zipcode_string'] = df['zipcode_str'].astype('string')
df['zipcode_category'] = df['zipcode_category'].astype('category')

df.info()

# you can see that the first column has dtype object
# while the second column has the new dtype string
# the third column has dtype category
 #   Column            Non-Null Count  Dtype   
---  ------            --------------  -----   
 0   zipcode_str       2 non-null      object  
 1   zipcode_string    2 non-null      string  
 2   zipcode_category  2 non-null      category
dtypes: category(1), object(1), string(1)

From the docs:

The 'string' extension type solves several issues with object-dtype NumPy arrays:

You can accidentally store a mixture of strings and non-strings in an object dtype array. A StringArray can only store strings.

object dtype breaks dtype-specific operations like DataFrame.select_dtypes(). There isn’t a clear way to select just text while excluding non-text, but still object-dtype columns.

When reading code, the contents of an object dtype array is less clear than string.

More info on working with the new string datatype can be found here: https://pandas.pydata.org/pandas-docs/stable/user_guide/text.html

python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B

Easiest way to do this:

# First you need to sort this DF as Column A as ascending and column B as descending 
# Then you can drop the duplicate values in A column 
# Optional - you can reset the index and get the nice data frame again
# I'm going to show you all in one step. 

d = {'A': [1,1,2,3,1,2,3,1], 'B': [30, 40,50,42,38,30,25,32]}
df = pd.DataFrame(data=d)
df

    A   B
0   1   30
1   1   40
2   2   50
3   3   42
4   1   38
5   2   30
6   3   25
7   1   32


df = df.sort_values(['A','B'], ascending =[True,False]).drop_duplicates(['A']).reset_index(drop=True)

df

    A   B
0   1   40
1   2   50
2   3   42

Using Pip to install packages to Anaconda Environment

All above answers are mainly based on use of virtualenv. I just have fresh installation of anaconda3 and don't have any virtualenv installed in it. So, I have found a better alternative to it without wondering about creating virtualenv.

If you have many pip and python version installed in linux, then first run below command to list all installed pip paths.

whereis pip

You will get something like this as output.

pip: /usr/bin/pip /home/prabhakar/anaconda3/bin/pip /usr/share/man/man1/pip.1.gz

Copy the path of pip which you want to use to install your package and paste it after sudo replacing /home/prabhakar/anaconda3/bin/pip in below command.

sudo /home/prabhakar/anaconda3/bin/pip install <package-name>

This worked pretty well for me. If you have any problem installing, please comment.

Programs & Examples On #Smart device

What is monkey patching?

Missing `server' JVM (Java\jre7\bin\server\jvm.dll.)

How can I get CMake to find my alternative Boost installation?

Set Label Text with JQuery

What is the function of FormulaR1C1?

python numpy machine epsilon

How can I create and style a div using JavaScript?

How to completely uninstall Visual Studio 2010?

How can I create a copy of an Oracle table without copying the data?

Limitations

Set a variable if undefined in JavaScript

Logical nullish assignment, ES2020+ solution

Comparing Methods

Basic Examples

Object/Array Examples

How can I one hot encode in Python?

Convert a tensor to numpy array in Tensorflow?

HTML Form: Select-Option vs Datalist-Option

anchor jumping by using javascript

Parameter binding on left joins with array in Laravel Query Builder

Java AES encryption and decryption

JavaScript chop/slice/trim off last character in string

C# Help reading foreign characters using StreamReader

Swift - Split string over multiple lines

How can I center text (horizontally and vertically) inside a div block?

how to create a list of lists

SQL Server "AFTER INSERT" trigger doesn't see the just-inserted row

Count words in a string method?

Using :before and :after CSS selector to insert Html

How do I loop through or enumerate a JavaScript object?

@ variables in Ruby on Rails

VB.NET - Remove a characters from a String

Fast Bitmap Blur For Android SDK

How to fix Error: "Could not find schema information for the attribute/element" by creating schema

Install numpy on python3.3 - Install pip for python3

Disabling submit button until all fields have values

How to prepend a string to a column value in MySQL?

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Find and extract a number from a string

I don't understand -Wl,-rpath -Wl,

How to display an unordered list in two columns?

Use css gradient over background image

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Select Top and Last rows in a table (SQL server)

Git Server Like GitHub?

Using Javascript can you get the value from a session attribute set by servlet in the HTML page

How does the "final" keyword in Java work? (I can still modify an object.)

File Explorer in Android Studio

Django. Override save for model

Execute combine multiple Linux commands in one line

How to use a variable inside a regular expression?

Javascript to convert UTC to local time

Create aar file in Android Studio

box-shadow on bootstrap 3 container

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

How to configure port for a Spring Boot application

How to enable core dump in my Linux C++ program

sort files by date in PHP

Selecting a row of pandas series/dataframe by integer index

How to put the legend out of the plot

'ssh-keygen' is not recognized as an internal or external command

How to send parameters with jquery $.get()

^[A-Za-Z ][A-Za-z0-9 ]* regular expression?

How to manipulate arrays. Find the average. Beginner Java

Rotating a point about another point (2D)

Can Flask have optional URL parameters?

C# LINQ find duplicates in List

Right way to split an std::string into a vector<string>

UITableView example for Swift

How to activate virtualenv?

Including another class in SCSS

Running npm command within Visual Studio Code

How do I run a Python script on my web server?

Best way to move files between S3 buckets?

Class constants in python

best way to preserve numpy arrays on disk

Converting JSON data to Java object

What is the best way to know if all the variables in a Class are null?

Applied to `pandas`