Detailed Description

An instance of the Congruence struct.

The four seeds used by the generator are stored in this struct. Because they must have global scope, they are contained within a structure to minimise the chances of a name conflict with other variables of global scope. The functions to process these values are accessed via function pointers contained within the struct. This simulates the member function concept of C++ using only C code. Most applications will require only a single generator instance - this one has safe values assigned to the member function pointers.

Usage

#include <stdio.h>
#include "randomWH.h"
#define SIM_DURATION 40000000L
.
.
.
 double mean=0, moment2=0, unif, variance;
    long int count;
 congruent.init(&congruent,1L,2L,3L,4L);
    for(count =0;count<SIM_DURATION;count++){
        unif = congruent.randomWH(&congruent);
        mean += unif;
        moment2 += (unif*unif);
    }
    mean /= SIM_DURATION;
    moment2 /= (SIM_DURATION-1.0); // using Bessel's correction
    variance = moment2-mean*mean*(SIM_DURATION)/(SIM_DURATION-1.0); // Bessel's correction continued
    printf("Mean after %ld iterations is %lf; sample variance is %lf\n", SIM_DURATION, mean, variance);

See Also: Congruence

Note: You may create other generators by declaring other structs of type Congruence but you must initialise them correctly.

The documentation for this struct was generated from the following file:

randomWH.h