manpagez: man pages & more
info gawk
Home | html | info | man
[ << ] [ < ] [ Up ] [ > ] [ >> ]         [Top] [Contents] [Index] [ ? ]

12.2.4 The Cliff Random Number Generator

The Cliff random number generator is a very simple random number generator that “passes the noise sphere test for randomness by showing no structure.” It is easily programmed, in less than 10 lines of awk code:

# cliff_rand.awk --- generate Cliff random numbers

BEGIN { _cliff_seed = 0.1 }

function cliff_rand()
{
    _cliff_seed = (100 * log(_cliff_seed)) % 1
    if (_cliff_seed < 0)
        _cliff_seed = - _cliff_seed
    return _cliff_seed
}

This algorithm requires an initial “seed” of 0.1. Each new value uses the current seed as input for the calculation. If the built-in rand() function (see section Numeric Functions) isn’t random enough, you might try using this function instead.


This document was generated on March 30, 2012 using texi2html 5.0.