random

Documentation

Index

• Variables
• func GetSeed() int64
• func Poisson(uniformRandom *rand.Rand, lambda float64) uint32
• func RandFactory() *rand.Rand
• func Round(uniformRandom *rand.Rand, num float64) int

Variables

var NextSeed int64 // is initialized to config.Cfg.Computation.Random_number_seed to avoid circular imports

Functions

func GetSeed

func GetSeed() int64

Get a random int64 from /dev/urandom to use as a seed

func Poisson

func Poisson(uniformRandom *rand.Rand, lambda float64) uint32

Algorithm taken from Wikipedia (https://en.wikipedia.org/wiki/Poisson_distribution#Generating_Poisson-distributed_random_variables). This differs from a naive implementation in avoiding rounding errors for lambda > 700

func RandFactory

func RandFactory() *rand.Rand

RandFactory returns a newly created random number generator with a new seed. Note: this is *not* thread safe, we assume you call this before starting the threads to give each its own RNG

func Round

func Round(uniformRandom *rand.Rand, num float64) int

Round randomly rounds an int either up or down, weighting the odds according to how far away from the integer it is. If the float is a perfect int, it always chooses that.