random.c File Reference

Random number generator - Definition. More...

#include "random.h"
#include <stdio.h>
#include <string.h>

Functions
void	vl_rand_init (VlRand *self)
	Initialise random number generator. More...
void	vl_rand_seed (VlRand *self, vl_uint32 s)
	Seed the state of the random number generator. More...
void	vl_rand_seed_by_array (VlRand *self, vl_uint32 const key[], vl_size keySize)
	Seed the state of the random number generator by an array. More...
void	vl_rand_permute_indexes (VlRand *self, vl_index *array, vl_size size)
	Randomly permute and array of indexes. More...
vl_uint32	vl_rand_uint32 (VlRand *self)
	Generate a random UINT32. More...

Detailed Description

Author

Andrea Vedaldi

Function Documentation

vl_rand_init()

void vl_rand_init

(

VlRand *

self

)

Parameters

self	number generator.

vl_rand_permute_indexes()

void vl_rand_permute_indexes	(	VlRand *	self,
		vl_index *	array,
		vl_size	size
	)

Parameters

self	random number generator.
array	array of indexes.
size	number of element in the array.

The function uses Algorithm P, also known as Knuth shuffle.

vl_rand_seed()

void vl_rand_seed	(	VlRand *	self,
		vl_uint32	s
	)

Parameters

self	random number generator.
s	seed.

vl_rand_seed_by_array()

void vl_rand_seed_by_array	(	VlRand *	self,
		vl_uint32 const	key[],
		vl_size	keySize
	)

Parameters

self	random number generator.
key	array of numbers.
keySize	length of the array.

vl_rand_uint32()

vl_uint32 vl_rand_uint32

(

VlRand *

self

)

Parameters

self	random number generator.

Returns

a random number in [0, 0xffffffff].