srand - seed the pseudo-random number generator

 

SYNOPSIS

<srand $seed>


DESCRIPTION
The srand function "seeds" the pseudo-random number generator with an integer $seed, which determines what sequence of pseudo-random numbers will be returned in future calls to rand and randpick. This can be used to help ensure the sequence is different each run (with a random seed), or to generate the same sequence on a subsequent run (with the same seed) i.e. for reproducibly random results.

If an empty string is given, a semi-random seed is created; this is also how the generator is seeded if srand is not called.


DIAGNOSTICS
The srand function returns the previous seed value.


EXAMPLE

  <srand 12345>
  <WHILE $loop lt 10>
    <rand 0 10> $ret
  </WHILE>

The output will always produce the same sequence of "random" numbers on a given platform.


CAVEATS
The srand function was added Mar. 16 2000.

The reproducibility and/or randomness of numbers is system-dependent.


SEE ALSO
rand, randpick


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