From: Bart Braem Date: 2009-01-23T23:08:11+09:00 Subject: Re: Separate random number generators? On Jan 22, 2:20 pm, James Gray wrote: > On Jan 22, 2009, at 5:39 AM, Bart Braem wrote: > > > > > On Jan 22, 12:13 pm, Lars Christensen wrote: > >> On Jan 22, 11:38 am, Bart Braem wrote: > > >>> For simulation work, I want to use multiple, independent random   > >>> number > >>> generators. Does anyone know up to date implementations? > > >> What do you mean by independent RNG? Numbers drawn from a single RNG > >> are usually independent enough. > > >> Do you mean separate deterministic PRNGs with fixed seeds for > >> reproducible sequences? Then take a look at this Ruby Quiz: > > >>http://www.splatbang.com/rubyquiz/quiz.rhtml?id=173_Not_So_Random > > > I indeed mean separate deterministic PRNGs with fixed seeds for > > reproducible sequences. Interesting to see this was a Ruby Quiz! Are > > there solutions without the use of DRb and other libraries? > > Sure.  See the first solution link on that page (also shown in the   > quiz write-up). > > James Edward Gray II The first solution is of course not that efficient, I will be generating lots of random numbers. I'm going to take a look at ruby- gsl, the ISAAC library gives strange results... Thanks for your help!