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Fish Moore

Random number generator class using the Fishmann-Moore algorithm.
Controller: CodeCogs



Class FishMoore

This class produces good quality random numbers using the Fishmann-Moore algorithm. It produces uniformly distributed pseudo-random 32-bit values with period of

It is best suited for simulations which require random sequences of length less than 10 million.

To give you an idea of the running time for each of the functions, here are the results for generating 100,000,000 random numbers on a 750MHz microprocessor :
  • genReal() 6 seconds
  • genInt() 6 seconds

This figure is obtained by generating two sequences of 1000 uniform floating point random numbers in the (0, 1) interval and then plotting them one versus the other. It shows that the distribution is indeed uniform.


  • G.S. Fishman and L.R. Moore (1986), "An exhaustive analysis of multiplicative congruential random number generators with modulus 2^31 - 1", SIAM J Sci. Stat. Comput., 7, pp. 24-45.
  • The Newran03 random number generator library of Robert Davies, http://www.robertnz.net/nr03doc.htm

Example 1

The following example displays 20 random floating point numbers and 20 random large integers. It uses two different generators to achieve this. The first generator uses the system timer to initialize the seed, while the second is simply initialized with a particular value. Notice that it was necessary to divide the timer with the FMDIV value in order to keep the seed in the (0, 1) interval. The output of the first generator will obviously vary with each execution of the program, while the output of the second will always be the same if the seed is never changed.
#include <iostream>
#include <time.h>
#include <codecogs/statistics/random/fishmoore.h>
using namespace std;
int main() {
    Stats::Random::FishMoore A(time(0) / FMDIV);
    Stats::Random::FishMoore B(0.113);
    for (int i = 0; i < 20; ++i)
        cout << A.genReal() << endl;
    cout << endl;
    for (int i = 0; i < 20; ++i)
        cout << B.genInt() << endl;
    return 0;


Lucian Bentea (August 2005)
Source Code

Source code is available when you agree to a GP Licence or buy a Commercial Licence.

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Members of FishMoore


FishMooredoubles = 0.46875 )[constructor]
sDefault value = 0.46875


voidsetSeeddoubles )
sSeed must be in the (0, 1) interval (endpoints are excluded).