From: Tim Bray <Tim.Bray@...>
Date: 2007-01-30T16:20:20+09:00
Subject: Re: generating negative random numbers


On Jan 29, 2007, at 11:10 PM, Josselin wrote:

> I know how to generate positive random numbers, but is it possible  
> to generate a random number in a range such  [-9..+9]   ?

irb(main):001:0> def rrand(x)
irb(main):002:1> rand(2*x) - x
irb(main):003:1> end
=> nil
irb(main):004:0> rrand 9
=> -7
irb(main):005:0> rrand 9
=> -8
irb(main):006:0> rrand 9
=> 5
irb(main):007:0> rrand 9
=> -8