From: Martin DeMello <martindemello@...>
Date: 2006-11-12T17:36:13+09:00
Subject: Re: Splitting an array into quads and putting them back together again.

On 11/12/06, CBlair1986 <CBlair1986@gmail.com> wrote:
> and I can easily rotate those, but now I'm not sure on how to put them
> back together like so:
>
> [a1][b1]
> [a2][b2]
>
> If anyone knows a good way to do this, it would be greatly appreciated.

require 'enumerator'

class Array
  def |(other)
    self.zip(other).map {|a,b| a+b}
  end

  def /(other)
    self + other
  end
end

a1 = [[1,2],[5,6]]
b1 = [[3,4],[7,8]]
a2 = [[9,10],[13,14]]
b2 = [[11,12],[15,16]]

p (a1|b1)/(a2|b2)

class Array
  def shape(cols)
    enum_slice(cols).map {|i| i.inject {|j, k| j|k}}.inject {|a, i| a/i}
  end
end

p [a1, b1, a2, b2].shape(2)