Tutorial by Examples: r

4.3 OpenGL 4.3 (or ARB_separate_attrib_format) adds an alternative way of specifying the vertex data, which creates a separation between the format of the data bound for an attribute and the buffer object source that provides the data. So instead of having a VAO per mesh, you may have a VAO per ver...

With a simple for loop, all zip archives in a directory can be extracted. for (i in dir(pattern=".zip$")) unzip(i) The dir function produces a character vector of the names of the files in a directory matching the regex pattern specified by pattern. This vector is looped through w...

The following regex includes 50 states and also Commonwealth/Territory (see www.50states.com): regex <- "(A[LKSZR])|(C[AOT])|(D[EC])|(F[ML])|(G[AU])|(HI)|(I[DLNA])|(K[SY])|(LA)|(M[EHDAINSOT])|(N[EVHJMYCD])|(MP)|(O[HKR])|(P[WAR])|(RI)|(S[CD])|(T[NX])|(UT)|(V[TIA])|(W[AVIY])" For exampl...

The following regular expression: us.phones.regex <- "^\\s*(\\+\\s*1(-?|\\s+))*[0-9]{3}\\s*-?\\s*[0-9]{3}\\s*-?\\s*[0-9]{4}$" Validates a phone number in the form of: +1-xxx-xxx-xxxx, including optional leading/trailing blanks at the beginning/end of each group of numbers, but not ...

General Properties: An Azimuthal Equidistant projection is best recognized when used in polar areas. It is used in the UN's emblem. From the center point, angle and distance are preserved. But the projection will distort shape and area to achieve this, especially as one moves further from the cente...

When a navigation property exist on a model, Entity Framework will automatically create a Foreign Key column. If a specific Foreign Key name is desired but is not contained as a property in the model, it can be set explicitly using the Fluent API. By utilizing the Map method while establishing the F...

Goto accepts the use of variable value to act as the label to goto. Example: @echo off echo a = 1 echo b = 2 set /p "foo=Enter option:" goto %foo% However, you should check the input so it will not go to somewhere that does not exist. Going to an undefined label will terminate...

BFS can be used to find the connected components of an undirected graph. We can also find if the given graph is connected or not. Our subsequent discussion assumes we are dealing with undirected graphs.The definition of a connected graph is: A graph is connected if there is a path between every p...

HTML: <div class="wrapper"> <div class="content"></div> </div> CSS: .wrapper{ min-height: 600px; } .wrapper:before{ content: ""; display: inline-block; height: 100%; vertical-align: middle; } .content { display...

The new Bootstrap 4 Navbar Component is improved over it’s Bootstrap 3.x predecessor. In Bootstrap 4, the Navbar is responsive by default and utilizes flexbox to make alignment of Navbar content much easier. It’s also a simple matter of using the new navbar-toggleable-* classes to change the Navbar ...

var EmberApp = require('ember-cli/lib/broccoli/ember-app'); module.exports = function(defaults) { var app = new EmberApp(defaults, { // Add options here datatables: { core: true, style: 'bs', extensions: [ { name: 'buttons', extensions: ['colVi...

Suppose we'd like to wrap the Google Maps JavaScript API google.maps: @JS('google.maps') library maps; import "package:js/js.dart"; @JS() class Map { external Map(Location location); external Location getLocation(); } We now have the Map Dart class which corresponds to t...

It's common practice in JavaScript to pass object literals to functions: // JavaScript printOptions({responsive: true}); Unfortunately we cannot pass Dart Map objects to JavaScript in these cases. What we have to do is create a Dart object that represents the object literal and contains all of...

Install pip : $ pip install django-cassandra-engine Add Getting Started to INSTALLED_APPS in your settings.py file: INSTALLED_APPS = ['django_cassandra_engine'] Cange DATABASES setting Standart: Standart DATABASES = { 'default': { 'ENGINE': 'django_cassandra_engine', ...

Go to https://www.blender.org/download/ Choose your operating system Click the proper mirror next to the version of blender for your operating system. You can usually just click the mirror closest to your current location. (more info) Also, at the bottom of the page are also...

In this example, we use this database: "your-project-name" : { "users" : { "randomUserId1" : { "display-name" : "John Doe", "gender" : "male" } "randomUserId2" :...

Note: You need to know which data referenced by getReference() first before you can completely understand this example. There are three common method to get your data from Firebase Realtime Database: addValueEventListener() addListenerForSingleValueEvent() addChildEventListener() When w...

Step 1 - installing VirtualBox Download and install VirtualBox according to your operating system. , it is required to run Genymotion. Step 2 - downloading Genymotion Go to the Genymotion download page and download Genymotion according to your operating system. Note: you will need to create a ...

Many developers have this problem when they work on huge projects, especially if they work on some modular CMS on plugins, addons, components etc. Here is solution for safe session start where if first checked PHP version to cover all versions and on next is checked if session is started. If session...

import sys from PyQt4 import QtGui def window(): app = QtGui.QApplication(sys.argv) w = QtGui.QWidget() b = QtGui.QLabel(w) b.setText("Hello World!") w.setGeometry(100,100,200,50) b.move(50,20) w.setWindowTitle("PyQt") w.show() sys.exit(app...