wnrndd(3)

NAME

wn_true_with_probability, wn_random_int_between, wn_ran

dom_double_between, wn_flat_distribution, wn_normal_distribution,

wn_exponential_distribution, wn_poisson_distribution - random

distribution

SYNOPSIS

#include <wn/wnrndd.h>
bool wn_true_with_probability(double prob)
int wn_random_int_between(int low,int high)
double wn_random_double_between(double low,double high)
double wn_flat_distribution(void)
double wn_normal_distribution(void)
double wn_exponential_distribution(void)
int wn_poisson_distribution(double mean)

DESCRIPTION

These routines generate random numbers with various proba

bility distributions, using wnrnd.

wn_true_with_probability returns (randomly) TRUE with

probability prob and FALSE with probability 1-prob.

wn_random_int_between returns a randomly chosen integer in

the range [low,high). low is in the range; high is not.

wn_random_double_between returns a randomly chosen double

in the range (low,high). It will never return low or high.

wn_flat_distribution is equivalent to

wn_random_double_between(0.0,1,0)".

wn_normal_distribution returns a double randomly chosen

according to a normal (gaussian) probability density with mean =

0 and standard deviation = 1.

wn_exponential_distribution returns a double randomly cho

sen according to an exponential probability density with mean =

1. An exponential probability density function has values

p(x) = exp(-x) for all x >= 0

p(x) = 0 for all x < 0

wn_poisson_distribution returns an integer randomly chosen

according to a Poisson distribution with mean mean.

SEE ALSO

wnrnd

AUTHOR

Will Naylor

WNLIB August 23, 1998

WNRNDD(3)