Tutorial by Examples: a

stroke (a path command)

context.stroke() Causes the perimeter of the Path to be stroked according to the current context.strokeStyle and the stroked Path is visually drawn onto the canvas. Prior to executing context.stroke (or context.fill) the Path exists in memory and is not yet visually drawn on the canvas. The unu...

html5-canvas • Path (Syntax only)

fill (a path command)

context.fill() Causes the inside of the Path to be filled according to the current context.fillStyle and the filled Path is visually drawn onto the canvas. Prior to executing context.fill (or context.stroke) the Path exists in memory and is not yet visually drawn on the canvas. Example code usi...

html5-canvas • Path (Syntax only)

clip (a path command)

context.clip Limits any future drawings to display only inside the current Path. Example: Clip this image into a triangular Path <!doctype html> <html> <head> <style> body{ background-color:white; } #canvas{border:1px solid red; } </style> <sc...

html5-canvas • Path (Syntax only)

Check if a file exists via a HEAD request

This function executes an AJAX request using the HEAD method allowing us to check whether a file exists in the directory given as an argument. It also enables us to launch a callback for each case (success, failure). function fileExists(dir, successCallback, errorCallback) { var xhttp = new XM...

JavaScript • AJAX

Reversing a linked list

You can also perform this task recursively, but I have chosen in this example to use an iterative approach. This task is useful if you are inserting all of your nodes at the beginning of a linked list. Here is an example: #include <stdio.h> #include <stdlib.h> #define NUM_ITEMS 10...

C Language • Linked lists

Display the bytecode of a function

The Python interpreter compiles code to bytecode before executing it on the Python's virtual machine (see also What is python bytecode?. Here's how to view the bytecode of a Python function import dis def fib(n): if n <= 2: return 1 return fib(n-1) + fib(n-2) # Display the disas...

Python Language • Accessing Python source code and bytecode

Exploring the code object of a function

CPython allows access to the code object for a function object. The __code__object contains the raw bytecode (co_code) of the function as well as other information such as constants and variable names. def fib(n): if n <= 2: return 1 return fib(n-1) + fib(n-2) dir(fib.__code__) de...

Python Language • Accessing Python source code and bytecode

Dictionaries Example

Dictionaries map keys to values. car = {} car["wheels"] = 4 car["color"] = "Red" car["model"] = "Corvette" Dictionary values can be accessed by their keys. print "Little " + car["color"] + " " + car["model&q...

Python Language • Dictionary

Installation or Setup

Detailed instructions on getting ibm-mobilefirst set up or installed.

ibm-mobilefirst • Getting started with ibm-mobilefirst

Basic Setup from GitHub

This example goes over how to set up CoreNLP from the GitHub repo. The GitHub code has newer features than the official release, but may be unstable. This example will take you through downloading, building, and running a simple command-line invocation of CoreNLP. Prerequisites: Java 8 or newer....

stanford-nlp • Getting started with stanford-nlp

NLTK installation with Conda.

To install NLTK with Continuum's anaconda / conda. If you are using Anaconda, most probably nltk would be already downloaded in the root (though you may still need to download various packages manually). Using conda: conda install nltk To upgrade nltk using conda: conda update nltk With a...

nltk • Getting started with nltk

Compilation

There are many compilers that support different versions of the OpenMP specification. OpenMP maintains a list here with the compiler that support it and the supported version. In general, to compile (and link) an application with OpenMP support you need only to add a compile flag and if you use the ...

openmp • Getting started with openmp

Get date in object

Get current date and time lib.date = TEXT lib.date { data = date:U strftime = %d.%m.%Y %H:%M:%S wrap = Today is | } Get last login time and date from fe_users lib.date = TEXT lib.date { data = TSFE:fe_user|user|lastlogin strftime = %d.%m.%Y %H:%M:%S wrap = Last logi...

typo3 • TypoScript

Removing from a Dictionary

Given this setup code: var dict = new Dictionary<int, string>() { { 1, "First" }, { 2, "Second" }, { 3, "Third" } }; Use the Remove method to remove a key and its associated value. bool wasRemoved = dict.Remove(2); Executing this code remo...

.NET Framework • Dictionaries

Collatz sequence

The while loop runs its body as long as the condition holds. For instance, the following code computes and prints the Collatz sequence from a given number: function collatz(n) while n ≠ 1 println(n) n = iseven(n) ? n ÷ 2 : 3n + 1 end println("1... and 4, 2, 1, ...

Julia Language • while Loops

Find smallest prime factor

In some situations, one might want to return from a function before finishing an entire loop. The return statement can be used for this. function primefactor(n) for i in 2:n if n % i == 0 return i end end @assert false # unreachable end Usage: jul...

Julia Language • for Loops

Multidimensional iteration

In Julia, a for loop can contain a comma (,) to specify iterating over multiple dimensions. This acts similarly to nesting a loop within another, but can be more compact. For instance, the below function generates elements of the Cartesian product of two iterables: function cartesian(xs, ys) f...

Julia Language • for Loops

Reduction and parallel loops

Julia provides macros to simplify distributing computation across multiple machines or workers. For instance, the following computes the sum of some number of squares, possibly in parallel. function sumofsquares(A) @parallel (+) for i in A i ^ 2 end end Usage: julia> sumo...

Julia Language • for Loops

Input validation

Although not traditionally considered loops, the @goto and @label macros can be used for more advanced control flow. One use case is when the failure of one part should lead to the retry of an entire function, often useful in input validation: function getsequence() local a, b @label start ...

Julia Language • @goto and @label

if...else statement

name = readline() if startswith(name, "A") println("Your name begins with A.") else println("Your name does not begin with A.") end Any expression, such as the if...else expression, can be put in statement position. This ignores its value but still execu...

Julia Language • Conditionals