pandazheng / swiftrandom Goto Github PK

import SwiftRandom

//Single pseudorandom normal variable
//with mean 0 and standard deviation 1
let x = randNormal(0, 1)

//Array of pseudorandom independent normal variables 
//with mean 0 and standard deviation 1 and length 10
let sample = randNormals(0, 1, 10)

//Sampling from array:

//with replacement
let numbers = [10, 11, 45, 1, 0, 4]
let bootstrapSample = sampleWithReplacement(numbers, 10)

//without replacement
let names = ["John", "Bob", "Anna", "Alice", "Chris", "Luke"]
let usersOrder = sampleWithoutReplacement(names, 4)

//with given probabilities
let letters = ["a", "b", "c", "d", "e"]
let probabilities = [0.5, 0.05, 0.05, 0.1, 0.3] //probabilities have to sum to 1

let randomLetters = sampleWithProbs(letters, probabilities, 10)