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Re: Random Derangement Of An Array

by pc88mxer (Vicar)
on Jul 05, 2008 at 21:44 UTC ( #695752=note: print w/replies, xml ) Need Help??

in reply to Random Derangement Of An Array

Have a look at this thread: random derangement. Suggestions include:
  1. generating a random permutation until you get a derangement (expected number of tries is e), and:
  2. using a modification of the basic random shuffle algorithm
It's a Mma mailing list, but I'm sure the algorithms can be translated to perl.

Update: the modification of the basic random shuffle algorithm is to swap position j with a random element from positions j through the end which doesn't violate the derangement condition.

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