From: Chris Shea <cmshea@...>
Date: 2008-03-25T10:24:54+09:00
Subject: Re: generating unique random numbers

On Mar 24, 7:00 pm, Jimmy Palmer <modernfos...@gmail.com> 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?
> --
> Posted viahttp://www.ruby-forum.com/.

Here's one more possibility:

numbers = (1..13).to_a
randoms = []
8.times {randoms << numbers.delete_at(rand(numbers.size))}

Though, Tim's solution might be most readable.

Chris