yes, thanks I figured that out yesterday, but wanted to wait for a reply first.

If one allows to shuffle the 0 column , collisions are possible and one needs to check.

If it stays fixed it's always fine.

> (Very-pseudo) random,

well "randomness" is not self defining, there are plenty of paradoxes in math were people had different concepts of "random". °

For instance if you said you want

that's a pretty hard problem to be done fast.

I suppose many solutions here will produce certain permutations with a bigger probability. So please be explicit what kind of randomness you want.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

°) classic example is roulette, the likelihood of a red or black number is always the same, even after a row of hundreds of reds. It's the likelihood of the red sequence which is low.

In reply to Re^3: Algorithm RFC: fast (pseudo-)random shuffle with no repetition (requirements?) by LanX
in thread Algorithm RFC: fast (pseudo-)random shuffle with no repetition by Anonymous Monk

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