RandomFast Class Reference

A fast linear congruential random number generator. More...

#include <random.h>

Public Member Functions
	RandomFast (unsigned int=239)
	Create a fast random number generator.
	RandomFast (int)
	Create a fast random number generator.
	~RandomFast ()
	Empty.
void	Seed (unsigned int)
	Changer the seed of the random number generator.
void	Seed (int)
	Changer the seed of the random number generator.
unsigned int	Integer ()
	Compute a random unsigned integer.
unsigned int	Integer (int)
	Compute a random unsigned integer within interval [0,a].
double	Uniform ()
	Compute uniform distribution in [0, 1[.
double	Uniform (const double &)
	Compute uniform distribution in [0, a[.
double	Uniform (const double &, const double &)
	Compute uniform distribution in [a, b[.
unsigned int	Poisson (const double &)
	Poisson random sequence.
int	Pick (const double *, int)
	Randomly pick one item given an array of probabilities.

Detailed Description

A fast linear congruential random number generator.

It uses the linear congruential generator x_n+1 = 3039177861 x_n (mod 232), introduced by Borosh and Niederreiter. This generator is fast and, despite its simplicity, optimal with respect to statistical independence of successive pseudo-random numbers.

See also

RandomMul, RandomXorShift

Constructor & Destructor Documentation

RandomFast() [1/2]

RandomFast::RandomFast

(

unsigned int

s = 239

)

Create a fast random number generator.

Parameters

s

Seed.

RandomFast() [2/2]

RandomFast::RandomFast

(

int

s

)

Create a fast random number generator.

Parameters

s

Seed.

Member Function Documentation

Integer()

unsigned int RandomFast::Integer

(

int

a

)

Compute a random unsigned integer within interval [0,a].

Parameters

a

Integer.

Pick()

int RandomFast::Pick	(	const double *	a,
		int	n )

Randomly pick one item given an array of probabilities.

Parameters

a	Array.
n	Size.

Poisson()

unsigned int RandomFast::Poisson

(

const double &

mu

)

Poisson random sequence.

Parameters

mu	Mean value.

Seed() [1/2]

void RandomFast::Seed

(

int

s

)

Changer the seed of the random number generator.

Parameters

s

Seed.

Seed() [2/2]

void RandomFast::Seed

(

unsigned int

s

)

Changer the seed of the random number generator.

Parameters

s

Seed.

Uniform() [1/2]

double RandomFast::Uniform

(

const double &

a

)

Compute uniform distribution in [0, a[.

Parameters

a	Amplitude.

Uniform() [2/2]

double RandomFast::Uniform	(	const double &	a,
		const double &	b )

Compute uniform distribution in [a, b[.

Parameters

a,b	Amplitude interval.