Tutorial by Examples: ti

Pitfall: Runtime.exec, Process and ProcessBuilder don't understand shell syntax

The Runtime.exec(String ...) and Runtime.exec(String) methods allow you to execute a command as an external process1. In the first version, you supply the command name and the command arguments as separate elements of the string array, and the Java runtime requests the OS runtime system to start th...

Java Language • Process

Installation or Setup

Detailed instructions on getting google-closure-compiler set up or installed.

google-closure-compiler • Getting started with google-closure-compiler

Display aspect ratio (DAR)

This is a screenshot of a video playing. You see a normal 16:9 video like you would expect to see in any modern video solution. This - the aspect ratio that the viewer sees - is what is called the display aspect ratio or DAR. From the illustrated parameters, we see that DAR = 1280:720 = 16:9 = 1....

video • Video aspect ratios

Picture aspect ratio (PAR)

Internally, all videos are a just series of pictures. Let's take a look at one such picture. That looks odd, right? Indeed. The pictures that make up a video may have an aspect ratio that are different from the DAR, most often for algorithmic reasons (e.g. only sizes that are a multiple of 16 can...

video • Video aspect ratios

Sample aspect ratio (SAR)

As the picture aspect ratio example indicates, videos are series of pictures that do not necessarily have the same aspect ratio as the final result to be displayed to the user. So how do you get from those stretched pictures to the normally displayed output? You need a stretching factor! This stret...

video • Video aspect ratios

Pixel aspect ratio

This is another name for sample aspect ratio and should be avoided, as the natural acronym (PAR) conflicts with picture aspect ratio.

video • Video aspect ratios

Creating a simple Behavior

To create a Behavior just extend the CoordinatorLayout.Behavior class. Extend the CoordinatorLayout.Behavior Example: public class MyBehavior<V extends View> extends CoordinatorLayout.Behavior<V> { /** * Default constructor. */ public MyBehavior() { ...

Android • CoordinatorLayout and Behaviors

Creating a Stack class with a List Object

Using a list object you can create a fully functional generic Stack with helper methods such as peeking and checking if the stack is Empty. Check out the official python docs for using list as Stack here. #define a stack class class Stack: def __init__(self): self.items = [] ...

Python Language • Stack

Creating a Chat Session and sending a message

Smack (Java) Using Smack 4.1 It is recommended to include Smack as Maven dependency in your project (e.g. by using gradle or Maven). Otherwhise the following Smack artifacts/jars have to be added manually to the classpath: smack-core, smack-extensions, smack-experimental, smack-im, smnack-tcp,...

xmpp • Getting started with xmpp

Installation or Setup

Detailed instructions on getting gerrit set up or installed.

gerrit • Getting started with gerrit

Connecting from script using password

When you really need to script ssh connection, piping the password into the ssh command does not work (echo passw0rd | ssh host). It is because the password is not read from standard input, but directly from TTY (teleprinter, teletypewriter, Teletype for historical reasons). But there is sshpass to...

Secure Shell • Getting started with Secure Shell

Getting Started

Create a file ckeditor.html with the following content: <!DOCTYPE html> <html> <head> <title>CKEditor Demo!</title> </head> <body> <script src="//cdn.ckeditor.com/4.6.1/basic/ckeditor.js"></script> <div id="e...

ckeditor • Getting started with ckeditor

Installation or Setup

Select the project you want to add the reference to Moq. Open Nuget for this project. Select "Browse" than type "moq" at the search box. Select "Moq" and than click on Install. Following these steps will install the Moq package and will add a reference to it i...

moq • Getting started with moq

Computing mean and variance

#include <iostream> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/mean.hpp> #include <boost/accumulators/statistics/variance.hpp> int main() { using namespace boost...

boost • Boost Accumulators Framework

Installation or Setup

Detailed instructions on getting quickblox set up or installed. Go to https://admin.quickblox.com and click on “Register” at the top or just follow the link: https://admin.quickblox.com/register.

quickblox • Getting started with quickblox

Installation or Setup

Detailed instructions on getting oracle11g set up or installed.

oracle11g • Getting started with oracle11g

Arrays of Primitives

These types do not inherit from Array<T> to avoid boxing, however, they have the same attributes and methods. Kotlin typeFactory functionJVM typeBooleanArraybooleanArrayOf(true, false)boolean[]ByteArraybyteArrayOf(1, 2, 3)byte[]CharArraycharArrayOf('a', 'b', 'c')char[]DoubleArraydoubleArrayOf...

Kotlin • Arrays

Small Arrow functions

# creates a function with no arguments, which returns 3 get_three = () -> return 3 # same as above get_three = -> 3 # creates a function with arguments add_three = (num) -> num + 3 # multiple arguments, etc. add = (a, b) -> a + b

coffeescript • Functions

Function Composition

We can define a function to perform function composition using anonymous function syntax: f ∘ g = x -> f(g(x)) Note that this definition is equivalent to each of the following definitions: ∘(f, g) = x -> f(g(x)) or function ∘(f, g) x -> f(g(x)) end recalling that in Julia,...

Julia Language • Closures

Implementing Currying

One application of closures is to partially apply a function; that is, provide some arguments now and create a function that takes the remaining arguments. Currying is a specific form of partial application. Let's start with the simple function curry(f, x) that will provide the first argument to a ...

Julia Language • Closures