From: Tim Hunter <TimHunter@...>
Date: 2008-03-25T10:05:41+09:00
Subject: Re: generating unique random numbers

Jimmy Palmer wrote:
> I'm trying to generate 8 unique random numbers between 1 and 13.
> 
> for example my first set of results could be:
> 
> 2, 8, 4, 6, 3, 10, 12, 1
> 
> the results need to be between 1 and 13 and they must be unique.
> 
> The rand(12) + 1 returns random numbers between 1 and 13, but they are
> not unique.  Any quick solutions?

~$ irb
irb(main):001:0> (1..13).to_a.sort_by{rand}[0..7]
=> [7, 3, 8, 2, 11, 4, 1, 9]
irb(main):002:0>


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