Purpose
Returns a uniformly-distributed random number between 0 and 1,
using as a seed either the argument provided or, if none, the
Unix process number
Usage
rand [seed]
Arguments
seed = seed value for random number generator
Example
1) Return a random value
punaluu{lris}165
0.791128
punaluu{lris}162
0.228747
Note that the values differ because the process number (used
by default as the random generator's seed) changed.
2) Return a random value for a given seed
punaluu{lris}167
0.505545
punaluu{lris}168
0.505545
Note that the values are the same when the same seed is used.