Tutorial by Examples: p

Detailed instructions on getting visual-studio-lightswitch set up or installed.

Detailed instructions on getting web-socket set up or installed.

Install apache: sudo apt-get install apache2 Install MySql: sudo apt-get install mysql-server Install PHP: sudo apt-get install php5 libapache2-mod-php5 Restart system: sudo systemctl restart apache2 Check PHP installation: php -r 'echo "\n\nYour PHP installation is working fi...

This is not something you will see in other programming environments. I came across it some years back and I couldn't understand why it was happening, but after working with MATLAB for some time I was able to figure it out. Look at the code snippet below: for x = 1:10 for x = 1:10 fpr...

set clipboard=unnamed This makes it possible to copy/paste between Vim and the system clipboard without specifying any special register. yy yanks the current line into the system clipboard p pastes the content of the system clipboard into Vim This only works if your Vim installation has cli...

1. $_ : The default input and pattern-searching space. Example 1: my @array_variable = (1 2 3 4); foreach (@array_variable){ print $_."\n"; # $_ will get the value 1,2,3,4 in loop, if no other variable is supplied. } Example 2: while (<FH>){ chomp($_); # $_ re...

import AVFoundation class QRScannerViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate { func viewDidLoad() { self.initCaptureSession() } private func initCaptureSession() { let captureDevice = AVCaptureDevice .defa...

Basic concept of IDisposable

Use the quotestar register to copy/paste between Vim and system clipboard "*yy copies the current line into the system clipboard "*p pastes the content of the system clipboard into Vim

Method Overriding and Overloading are two forms of polymorphism supported by Java. Method Overloading Method overloading (also known as static Polymorphism) is a way you can have two (or more) methods (functions) with same name in a single class. Yes its as simple as that. public class Shape{ ...

Dynamic Time Warping(DTW) is an algorithm for measuring similarity between two temporal sequences which may vary in speed. For instance, similarities in walking could be detected using DTW, even if one person was walking faster than the other, or if there were accelerations and decelerations during ...

Detailed instructions on getting azure-documentdb set up or installed.

Suppose you are asked, given the total weight you can carry on your knapsack and some items with their weight and values, how can you take those items in such a way that the sum of their values are maximum, but the sum of their weights don't exceed the total weight you can carry? The 0-1 indicates e...

The mellium.im/xmpp/jid package implements operations on JIDs. To split a JID string into its component parts the SplitString function may be used: lp, dp, rp, err := SplitString("[email protected]") No validation is performed by the function and the parts are not guaranteed to be vali...

The DirectX SDK is included within the Windows SDK, in all versions past Windows SDK v8. Normally, the Windows SDK is installed with Visual Studio (any version past Visual Studio 2012), however, it can be installed separately. Previously, the DirectX SDK was available as a separate installation, the...

In general, we tend to back up the DB with the pgAdmin client. The following is a sh script used to save the database (under linux) in two formats: SQL file: for a possible resume of data on any version of PostgreSQL. Dump file: for a higher version than the current version. #!/bin/sh...

Problem ConcurrentDictionary shines when it comes to instantly returning of existing keys from cache, mostly lock free, and contending on a granular level. But what if the object creation is really expensive, outweighing the cost of context switching, and some cache misses occur? If the same key ...

To list the dependency tree: gem dependency To list which gems depend on a specific gem (bundler for example) gem dependency bundler --reverse-dependencies

The example above can also be implemented with fences and relaxed atomic operations: int x, y; std::atomic<bool> ready{false}; void init() { x = 2; y = 3; atomic_thread_fence(std::memory_order_release); ready.store(true, std::memory_order_relaxed); } void use() { if (re...

Let's discuss with an example. From n items, in how many ways you can choose r items? You know it is denoted by . Now think of a single item. If you don't select the item, after that you have to take r items from remaining n-1 items, which is given by . If you select the item, after that you hav...