(gawk.info.gz) Cliff Random Function
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12.2.4 The Cliff Random Number Generator
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The Cliff random number generator
(http://mathworld.wolfram.com/CliffRandomNumberGenerator.html) 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 ( Numeric Functions) isn't random enough, you
might try using this function instead.
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