From: Max Williams <toastkid.williams@...>
Date: 2008-07-04T00:57:40+09:00
Subject: Re: pseudo-randomize an array in a consistent order

Thanks guys

This is what i did in the meantime since asking (I monkey-patched 
Array):

class Array

  def randomize(seed=nil)
   srand(seed) if seed
   self.sort{|a,b| rand <=> rand }
  end

  def randomize!(seed=nil)
   srand(seed) if seed
   self.sort!{|a,b| rand <=> rand }
  end

end

I'm worried though that using sort like this is a bit inefficient.  The 
array being sorted is around 3000 numbers (and not likely to exceed 
5000) so maybe that's not too much of an issue.  Is there a more 
efficient way you can think of?

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