Hi, I usually do this:
#getting the seed from the number of seconds from the Epoch SecondsSinceTheUNIXEpoch := function() local path, date,str,a; path := DirectoriesSystemPrograms();; date := Filename( path, "date" ); str := ""; a := OutputTextString(str,true); Process( DirectoryCurrent(), date, InputTextNone(), a, ["+%s"] ); CloseStream(a); NormalizeWhitespace(str); return Int(str); end; rnd := RandomSource(IsGAPRandomSource,SecondsSinceTheUNIXEpoch()); this may be quite ugly code, but it works on UNIX machines. However, MersenneTwister is 'immune' to setting the seed this way, I don't know why.. best, @ On Sat, Apr 25, 2009 at 6:57 PM, Joe Bohanon <jbohan...@gmail.com> wrote: > I have a problem I'm working on that involves trying to find an element > conjugating two subgroups of large matrix groups. As I will likely have to > run through lots of elements (even after some reductions to smaller > subgroups). I want to take advantage of a cluster with multiple processors, > but the way I understand it, if I start gap off fresh and run Random or > PseudoRandom, I will get the same sequence of elements. > > I'd like to be able to change the seed based on which instance of the > program I am running. All of the nodes have a shared hard drive, so I can > get an incrementor easily. I just don't know how to set the randomizer to > start with a different seed. > > Thanks > Joe > > _______________________________________________ > Forum mailing list > Forum@mail.gap-system.org > http://mail.gap-system.org/mailman/listinfo/forum > _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
