random_uniform_discrete

Generates pseudorandom numbers from a discrete uniform distribution.

Synopsis

#include <imsls.h>

int *imsls_f_random_uniform_discrete(int n_random, int k, …, 0)

The type double function is imsls_d_random_uniform_discrete.

Required Arguments

int n_random (Input)
Number of random numbers to generate.

int k (Input)
Parameter of the discrete uniform distribution. The integers 1, 2, ..., k occur with equal probability. Parameter k must be positive.

Return Value

An integer array of length n_random containing the random discrete uniform deviates.

Synopsis with Optional Arguments

#include <imsls.h>

int *imsls_f_random_uniform_discrete (int n_random, int k,
IMSLS_RETURN_USER, int ir[],
0)

Optional Arguments

IMSLS_RETURN_USER, int ir[] (Output)
User-supplied integer array of length n_random containing the random discrete uniform deviates.

Description

Function imsls_f_random_uniform_discrete generates pseudorandom numbers from a uniform discrete distribution over the integers 1, 2, ...k. A random integer is generated by multiplying k by a uniform (0, 1) random number, adding 1.0, and truncating the result to an integer. This, of course, is equivalent to sampling with replacement from a finite population of size k.

Example

In this example, imsls_f_random_uniform_discrete generates five pseudorandom discrete uniform deviates from a discrete uniform distribution over the integers 1 to 6.

 

#include <imsls.h>

 

int main()

{

int n_random = 5;

int k = 6;

int *ir;

 

imsls_random_seed_set(123457);

 

ir = imsls_f_random_uniform_discrete(n_random, k,

0);

 

imsls_i_write_matrix("Discrete uniform (1, 6) random deviates:" , 1,

n_random, ir,

IMSLS_NO_COL_LABELS,

0);

}

Output

 

Discrete uniform (1, 6) random deviates:

6 2 5 4 6