On Mar 12, 2011, at 5:37 AM, Colin Law wrote:

On 12 March 2011 10:10, Erwin <yves_duf...@mac.com> wrote:
I know how to generate a random number between 1 and 2 :

def random
 return (1 + rand(2))
end

but let's say  I would like to return 1 in 80% of the calls and 2 in
20% of the call...
which library should I use ?  ( I've seen a lot at http://raa.ruby-lang.org/
)


No doubt there are better ways but something like
(rand(100) + 120)/100
should do it.

Colin


Well, perhaps something that reveals the intention better:

def usually_one
  rand < 0.80 ? 1 : 2
end

-Rob

Rob Biedenharn          
r...@agileconsultingllc.com     http://AgileConsultingLLC.com/
r...@gaslightsoftware.com               http://GaslightSoftware.com/

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