[GAP Forum] Question about Random Elements

Alexander Konovalov alexander.konovalov at gmail.com
Sat Apr 25 23:16:01 BST 2009

Dear Joe,

the IO package by Max Neunhöffer has so called "real random sources".  
The IO manuals says: "It is an extension to the library mechanism of  
random source objects that uses the devices /dev/random and /dev/ 
urandom available on Linux systems (and maybe on other operating  
systems) providing random numbers that are impossible to predict."

See them in the IO manual here: http://www.gap-system.org/Manuals/pkg/io/doc/chap6.html

Best wishes,

On 25 Apr 2009, at 18:57, Joe Bohanon 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
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