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.
void	vl_rand_seed (VlRand *self, vl_uint32 s)
	Seed the state of the random number generator.
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.
void	vl_rand_permute_indexes (VlRand *self, vl_index *array, vl_size size)
	Randomly permute and array of indexes.
vl_uint32	vl_rand_uint32 (VlRand *self)
	Generate a random UINT32.

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Detailed Description

Author:

Andrea Vedaldi

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Function Documentation

void vl_rand_init

(

VlRand *

self

)

Parameters:

self	number generator.

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.

void vl_rand_seed	(	VlRand *	self,
		vl_uint32	s
	)

Parameters:

self	random number generator.
s	seed.

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_uint32 vl_rand_uint32

(

VlRand *

self

)

Parameters:

self	random number generator.

Returns:

a random number in [0, 0xffffffff].