From: Chris Blair <cblair1986@...>
Date: 2006-11-16T17:35:38+09:00
Subject: Re: Splitting an array into quads and putting them back together again.

I don't mean to reply to myself, but I just realized that the way I
was rotating the array wasn't correct. But, I got it figured out, so
here it is:

class Array
  # Returns a rotated( once, clockwise ) array derived from self
  def rotate()
    self.transpose.map{ |a| a.reverse }
  end
end

I know, it's simple, but it might be useful.