random.c File Reference

Generating peudo random numbers. More...

Typedefs
typedef struct SprRandGen	SprRandGen

Functions
void	spr_rand_init (SprRandGen *restrict rg_state, const uint32_t *val, int Nval)
uint32_t	spr_rand_u32 (SprRandGen *restrict rg_state)
uint64_t	spr_rand_u64 (SprRandGen *restrict rg_state)
float	spr_rand_f32 (SprRandGen *restrict rg_state)
double	spr_rand_f64q (SprRandGen *restrict rg_state)
	Calculate the next 32 (pseudo) random bits and update the state of the random generator rg_state. More...
double	spr_rand_f64 (SprRandGen *restrict rg_state)
double	spr_randn_f64 (SprRandGen *restrict rg_state)
unsigned int	spr_rand_modN (unsigned int n, SprRandGen *restrict rg_state)
float *	spr_rand_vec_f32 (float x[], int n, float rmax, SprRandGen *restrict rg_state)
float *	spr_randn_vec_f32 (float x[], int n, SprRandGen *restrict rg_state)
int	spr_rand_m (int indx[], int n, int m, SprRandGen *restrict rg_state)

Variables
SprRandGen	spr_rand_default

Detailed Description

Generating peudo random numbers.

Author

Kris Demuynck

Date

31 May 2010

Generate pseudo random number. Multiple generators can be generated. The global generator is MT-safe in the sense that it will not crash and will provide randon numbers. However, even after reorganizing the random numbers, the sequence may still differ from those returned in an equivalent single threaded application.

Algorithm:

François Panneton, Pierre L'Ecuyer, Makoto Matsumoto Improved long-period generators based on linear recurrences modulo 2, ACM Transactions on Mathematical Software (TOMS), Volume 32, Issue 1, pages 1–16, March 2006

Revision History:

16 Nov 1991 - DVC

First version, based on rand()

6 Jan 1995 - KD

Use rand48() functions for better distributed random variables.

28 Oct 2002 - KD

Added a random generator for normal distributed numbers.

24 Nov 2008 - JR

Mersenne Twister random generator (single static random generator, non MT-safe)

31 May 2010 - KD

Use of the WELL1024a random generator