From: Eric K Idema <eki@...>
Date: 2009-01-26T03:34:55+09:00
Subject: Re: Separate random number generators?

Are you aware of the random gem?  I think it's exactly what you're looking for:

  http://random.rubyforge.org/rdoc/index.html

I use it in my game library to provide repeatable random numbers (with the
requirement that the library backs a server, so I need to have one rng per
game).

If you need a pure ruby solution, I made a limited port of the random gem
as well.  It lacks some of the api, but draws the same numbers for a given
seed:

  http://github.com/eki/vying/blob/912db0052151d40185309b62ceee83733b34bfd5/lib/vying/random.rb

It's part of my game library, but it's only one file so you can just extract
the rng if you want to use it.

Eric

-- 
eki@vying.org

On 19:38 Thu 22 Jan     , Bart Braem wrote:
> For simulation work, I want to use multiple, independent random number
> generators. Does anyone know up to date implementations?
> 
> I found randomr but that is inactive sinds 2001 and clearly marked
> alpha (http://rubyvm.sourceforge.net/subprojects/randomr/)
> I also found some projects from MoonWolf from 2004 but his site
> (www.moonwolf.com, see e.g. http://raa.ruby-lang.org/project/random-mt19937/)
> is offline. Which makes it hard to get to the code.
> There is a generator that uses certain sites, but that is not really
> an option.
> I am now going to look at the isaac gem, but its version number 0.0.2
> does not make me feel very happy.
> 
> Did anyone find better implemenations of PRNGs?
>