Tutorial by Examples: r

Create setup script ~/.perlbrew.sh: # Reset any environment variables that could confuse `perlbrew`: export PERL_LOCAL_LIB_ROOT= export PERL_MB_OPT= export PERL_MM_OPT= # decide where you want to install perlbrew: export PERLBREW_ROOT=~/perlbrew [[ -f "$PERLBREW_ROOT/etc/bashrc" ]...

We'll assume you're doing this in Visual Studio 2015 (VS 2015 Community, in my case). Create an empty Console project in VS. In Project | Properties change the Output Type to Windows Application. Next, use NuGet to add FsXaml.Wpf to the project; this package was created by the estimable Reed Cop...

You have to create a XAML file that defines the main window that contains our menu and drawing space. Here's the XAML code in MainWindow.xaml: <!-- This defines the main window, with a menu and a canvas. Note that the Height and Width are overridden in code to be 2/3 the dimensions of the...

The XAML file for the spirograph parameters is below. It includes three text boxes for the spirograph parameters and a group of three radio buttons for color. When we give radio buttons the same group name - as we have here - WPF handles the on/off switching when one is selected. <!-- This fi...

namespace Spirograph type MainWindow(app: App, model: Model) as this = inherit MainWindowXaml() let myApp = app let myModel = model let whenLoaded _ = () let whenClosing _ = () let whenClosed _ = () let menuExitHandler _ = System.Wind...

<!-- All boilerplate for now --> <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Application.Resources> </Application.Reso...

FitViewports are viewports that always maintain the aspect ratio. It does this by creating black bars on the edges where there is space left. This is one of the most commonly used viewports. Usage: private Viewport viewport; private Camera camera; public void create() { camera = new Ortho...

Transcript show: 'Hello World!'. This will print Hello World! to the Transcript window in Smalltalk. Transcript is the class that allows you to print to the Transcript window by sending the message show: to that object. The colon indicates that this message requires a parameter which is in this c...

Getting Started Install NuGet packages: Microsoft.AspNet.Identity.EntityFramework Microsoft.AspNet.Identity.Core Microsoft.AspNet.Identity.OWIN Register action - Account controller [HttpPost] [AllowAnonymous] [ValidateAntiForgeryToken] public async Task<ActionResult> R...

Read the data of Create And Write To A Stream back into a program. with Ada.Streams.Stream_IO; procedure Main is -- -- ... same type definitions as in referenced example -- Fruit_Colors : array (Fruit) of Color; use Ada.Streams.Stream_IO; F : File_Type; X : Fruit...

As of Salt version 2014.1.0, Salt uses a date based system for version numbers. Version numbers are in the format YYYY.MM.R. The year (YYYY) and month (MM) indicate when the release was created. The bugfix release number (R) increments within that feature release. In order to distinguish future rel...

@echo off cls echo Please input the file path, surrounded by "double quotation marks" if necessary. REM If you don't want to redirect, escape the > by preceding it with ^ set /p filepath=^> echo Writing a random number echo %RANDOM% > %filepath% echo Reading the random n...

The following example shows how a set of data obtained from a remote source can be rendered into a component. We make an AJAX request using fetch, which is build into most browsers. Use a fetch polyfill in production to support older browsers. You can also use any other library for making requests ...

Let's say we want to go to the first day of a given month: date <- as.Date("2017-01-20") > as.POSIXlt(cut(date, "month")) [1] "2017-01-01 EST"

Let's say we want to move a given date a numof months. We can define the following function, that uses the mondate package: moveNumOfMonths <- function(date, num) { as.Date(mondate(date) + num) } It moves consistently the month part of the date and adjusting the day, in case the date re...

Shaders 3.3 + extension.seen at radeon hd5500 #version 330 triangles deployed so that normal to point out of a cube.trace each triangle 3points order. //#include <stdio.h> //#include <string.h> //#include <iostream> //#include <glib.h> #include <gdk/gdkx.h>...

To get a list of the service on your system, you may run: service --status-all The output of service --status-all lists the state of services controlled by System V. The + indicates the service is running, - indicates a stopped service. You can see this by running service SERVICENAME status for...

ng new NewProject or ng init NewProject

The Flexbox (Flexible box) layout, introduced in CSS3 provides a more efficient way to lay out, align and distribute space among children elements(flex items) within a container element(flex container). Most importantly even when their sizes are unknown or dynamic and hence the term "flex"...

Caveat: alloca is only mentioned here for the sake of completeness. It is entirely non-portable (not covered by any of the common standards) and has a number of potentially dangerous features that make it un-safe for the unaware. Modern C code should replace it with Variable Length Arrays (VLA). Ma...