random.c File Reference

Random Number Generators. More...

#include <lib/random/random.h>
#include <core/intrinsics.h>
#include <lib/lib_internal.h>
#include <lib/random/xoroshiro.h>
#include <math.h>
#include <memory.h>

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Functions
void	random_lib_lp_init (void)
double	Random (void)
uint64_t	RandomU64 (void)
double	Expent (double mean)
double	Normal (void)
int	RandomRange (int min, int max)
int	RandomRangeNonUniform (int x, int min, int max)
double	Gamma (unsigned ia)
double	Poisson (void)
unsigned	Zipf (double skew, unsigned limit)

Detailed Description

Random Number Generators.

Piece-Wise Deterministic Random Number Generators.

Copyright

Copyright (C) 2008-2021 HPDCS Group https://hpdcs.github.io

Definition in file random.c.

Function Documentation

Expent()

double Expent

(

double

mean

)

Return a random number according to an Exponential distribution. The mean value of the distribution must be passed as the mean value.

Parameters

mean	Mean value of the distribution

Returns

A random number

Definition at line 61 of file random.c.

Gamma()

double Gamma

(

unsigned

ia

)

Return a number in according to a Gamma Distribution of Integer Order ia, a waiting time to the ia-th event in a Poisson process of unit mean.

Author

D. E. Knuth

Parameters

ia	Integer Order of the Gamma Distribution

Returns

A random number

Definition at line 118 of file random.c.

Normal()

double Normal

(

void

)

Return a random number according to a Standard Normal Distribution

Returns

A random number

Definition at line 74 of file random.c.

Poisson()

double Poisson

(

void

)

Return the waiting time to the next event in a Poisson process of unit mean.

Returns

A random number

Definition at line 162 of file random.c.

Zipf()

unsigned Zipf	(	double	skew,
		unsigned	limit
	)

Return a random sample from a Zipf distribution. Based on the rejection method by Luc Devroye for sampling: "Non-Uniform Random Variate Generation, page 550, Springer-Verlag, 1986

Parameters

skew	The skew of the distribution
limit	The largest sample to retrieve

Returns

A random number

Definition at line 176 of file random.c.