[PD] Random without repeating numbers

Mathieu Bouchard matju at sympatico.ca
Fri Nov 29 17:14:07 CET 2002


On Fri, 29 Nov 2002, .--- ... wrote:
> ( 02.11.28 13:19 +0000 ) Enrique Franco:
> > I mean, for instance, if the random range is 5 I want to get a different 
> > number each time.
> But that's not random!!

Yes it's random, but it's not uniform random. It's a Markov chain with a
probability matrix of:

 0 ¼ ¼ ¼ ¼
 ¼ 0 ¼ ¼ ¼       
 ¼ ¼ 0 ¼ ¼       
 ¼ ¼ ¼ 0 ¼       
 ¼ ¼ ¼ ¼ 0

which is an all-ones matrix minus the identity matrix (and then divided by
4 for standardization...)

________________________________________________________________
Mathieu Bouchard                       http://artengine.ca/matju





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