Tutorial by Examples: dom

A pseudo-random number generator generates values that can be guessed based on previously generated values. In other words: it is deterministic. Do not use a pseudo-random number generator in situations where a true random number is required. #include <iostream> #include <random> in...
The arc4random_uniform() function is the simplest way to get high-quality random integers. As per the manual: arc4random_uniform(upper_bound) will return a uniformly distributed random number less than upper_bound. arc4random_uniform() is recommended over constructions like ''arc4random() % uppe...
The following code demonstrates usage of arc4random_uniform() to generate a random integer between 3 and 12: uint32_t randomIntegerWithinRange = arc4random_uniform(10) + 3; // A random integer between 3 and 12 This works to create a range because arc4random_uniform(10) returns an integer between...
To generate random permutation of 5 numbers: sample(5) # [1] 4 5 3 1 2 To generate random permutation of any vector: sample(10:15) # [1] 11 15 12 10 14 13 One could also use the package pracma randperm(a, k) # Generates one random permutation of k of the elements a, if a is a vector, # ...
A major problem with parallelization is the used of RNG as seeds. Random numbers by the number are iterated by the number of operations from either the start of the session or the most recent set.seed(). Since parallel processes arise from the same function, it can use the same seed, possibly causin...
Our randomNumbers() function can be re-written to use a generator. <?php function randomNumbers(int $length) { for ($i = 0; $i < $length; $i++) { // yield tells the PHP interpreter that this value // should be the one used in the current iteration. yield mt...
Returns a random integer between min and max: function randomBetween(min, max) { return Math.floor(Math.random() * (max - min + 1) + min); } Examples: // randomBetween(0, 10); Math.floor(Math.random() * 11); // randomBetween(1, 10); Math.floor(Math.random() * 10) + 1; // randomBet...
Flash will not load data from a domain other than the one your application is running on unless that domain has an XML crossdomain policy either in the root of the domain (e.g. http://somedomain.com/crossdomain.xml) or somewhere that you can target with Security.loadPolicyFile(). The crossdomain.xml...
Assuming we have an array myArray: var value:* = myArray[int(Math.random() * myArray.length)]; Note we use int to cast the result of Math.random() to an int because values like 2.4539543 would not be a valid array index.
First define the circle radius and its center: var radius:Number = 100; var center:Point = new Point(35, 70); Then generate a random angle in radians from the center: var angle:Number = Math.random() * Math.PI * 2; Then generate an effective radius of the returned point, so it'll be inside ...
function randomAngleRadians():Number { return Math.random() * Math.PI * 2; } Example outputs: 5.490068569213088 3.1984284719180205 4.581117863808207
To get any random color: function randomColor():uint { return Math.random() * 0xFFFFFF; } If you need more control over the red, green and blue channels: var r:uint = Math.random() * 0xFF; var g:uint = Math.random() * 0xFF; var b:uint = Math.random() * 0xFF; var color:uint = r <&...
var alphabet:Vector.<String> = new <String>[ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", &q...
This example generates random values between 0 and 2147483647. Random rnd = new Random(); int randomNumber = rnd.Next();
Generate a random number between 0 and 1.0. (not including 1.0) Random rnd = new Random(); var randomDouble = rnd.NextDouble();
Generate a random number between minValue and maxValue - 1. Random rnd = new Random(); var randomBetween10And20 = rnd.Next(10, 20);
When creating Random instances with the same seed, the same numbers will be generated. int seed = 5; for (int i = 0; i < 2; i++) { Console.WriteLine("Random instance " + i); Random rnd = new Random(seed); for (int j = 0; j < 5; j++) { Console.Write(rnd.Next(...
Two Random class created at the same time will have the same seed value. Using System.Guid.NewGuid().GetHashCode() can get a different seed even in the same time. Random rnd1 = new Random(); Random rnd2 = new Random(); Console.WriteLine("First 5 random number in rnd1"); for (int i = 0...
# Generates 5 random numbers from a uniform distribution [0, 1) np.random.rand(5) # Out: array([ 0.4071833 , 0.069167 , 0.69742877, 0.45354268, 0.7220556 ])
# Creates a 5x5 random integer array ranging from 10 (inclusive) to 20 (inclusive) np.random.randint(10, 20, (5, 5)) ''' Out: array([[12, 14, 17, 16, 18], [18, 11, 16, 17, 17], [18, 11, 15, 19, 18], [19, 14, 13, 10, 13], [15, 10, 12, 13, 18]]...

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