[Numpy-discussion] random permutation

Charles R Harris charlesr.harris at gmail.com
Sat Jan 13 23:54:59 EST 2007

On 1/13/07, Sebastian Haase <seb.haase at gmx.net> wrote:


I understand this - but I thought the algorithm might involve some
> rounding(-error) cases that would produce different results especially
> when changing the CPU (intel vs. PowerPC). I found this to be true
> even for non pseudo-random code that between CPU-types results were
> different within a given epsilon.

Its all 32 bit words, or rather bits. IIRC, it is based on an irreducible
polynomial over Z_2, so all the coefficients are 0 or 1. The original paper
is worth a read if you like that sort of stuff.

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