From: ara.t.howard@...
Date: 2006-06-07T07:48:39+09:00
Subject: Re: Strange behaviour of Rb-Gsl random numbers (Windows one-click installer)

On Wed, 7 Jun 2006 Nuralanur@aol.com wrote:

> Dear all,
>
> I've installed Rb-gsl for the Ruby-one click installer,
> and tried GSL::Rng.new.uniform to get a random number.
> This works, but always gives the same number:
>
>
>
> require "gsl"
>
> res=[]
> for k in  0..20
> res<<GSL::Rng.new.uniform
> end
> p res
>
>> res=[0.999741748906672, 0.999741748906672, 0.999741748906672,
> 0.999741748906672, 0.999741748906672, 0.999741748906672, 0.999741748906672,
> 0.999741748906672, 0.999741748906672, 0.999741748906672, 0.999741748906672,
> 0.999741748906672, 0.999741748906672, 0.999741748906672, 0.999741748906672,
> 0.999741748906672, 0.999741748906672, 0.999741748906672, 0.999741748906672,
> 0.999741748906672, 0.999741748906672]
>
> Why ?
>
> Thank you,
>
> best regards,
>
> Axel

i confirmed it - this works on my windows box:


   jib:~ > ruby -r gsl -e'  include GSL;  r = Rng.alloc Rng::TAUS, 1;  p Array.new(20).map!{ r.uniform }  '

   [0.186914603225887, 0.951039797859266, 0.545435771113262, 0.0746261349413544,
   0.22921886225231, 0.522971297148615, 0.0927675529383123, 0.511819139821455,
   0.339204750722274, 0.793815617682412, 0.00488071935251355, 0.342924846103415,
   0.296411268645898, 0.933765491936356, 0.208252872806042, 0.0223858365789056,
   0.256050609983504, 0.684481433359906, 0.983118103351444, 0.441584395710379]


regards.

-a
-- 
suffering increases your inner strength.  also, the wishing for suffering
makes the suffering disappear.
- h.h. the 14th dali lama