Random functions
[Miscellaneous helper algorithms]

Classes
class	spot::barand< gen >
	Compute pseudo-random integer value between 0 and n included, following a binomial distribution for probability p. More...
Functions
void	spot::srand (unsigned int seed)
	Reset the seed of the pseudo-random number generator.
int	spot::rrand (int min, int max)
	Compute a pseudo-random integer value between min and max included.
int	spot::mrand (int max)
	Compute a pseudo-random integer value between 0 and max-1 included.
double	spot::drand ()
	Compute a pseudo-random double value between 0.0 and 1.0 (1.0 excluded).
double	spot::nrand ()
	Compute a pseudo-random double value following a standard normal distribution. (Odeh & Evans).
double	spot::bmrand ()
	Compute a pseudo-random double value following a standard normal distribution. (Box-Muller).
int	spot::prand (double p)
	Return a pseudo-random positive integer value following a Poisson distribution with parameter p.

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Function Documentation

double spot::bmrand

(

)

Compute a pseudo-random double value following a standard normal distribution. (Box-Muller).

This uses the polar form of the Box-Muller transform to generate random values.

double spot::drand

(

)

Compute a pseudo-random double value between 0.0 and 1.0 (1.0 excluded).

See also:

mrand, rrand, srand

int spot::mrand

(

int

max

)

Compute a pseudo-random integer value between 0 and max-1 included.

See also:

drand, rrand, srand

double spot::nrand

(

)

Compute a pseudo-random double value following a standard normal distribution. (Odeh & Evans).

This uses a polynomial approximation of the inverse cumulated density function from Odeh & Evans, Journal of Applied Statistics, 1974, vol 23, pp 96-97.

int spot::prand

(

double

p

)

Return a pseudo-random positive integer value following a Poisson distribution with parameter p.

Precondition:

p > 0

int spot::rrand	(	int	min,
		int	max
	)

Compute a pseudo-random integer value between min and max included.

See also:

drand, mrand, srand

void spot::srand

(

unsigned int

seed

)

Reset the seed of the pseudo-random number generator.

See also:

drand, mrand, rrand

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