From: Paul Lutus <nospam@...>
Date: 2006-11-12T15:15:05+09:00
Subject: Re: Splitting an array into quads and putting them back together again.

CBlair1986 wrote:

> Hi all, I've got a question. A really quick, easy-to-answer question,
> if I'm lucky ;)
> 
> I have an array of arrays:
> 
> a = [[ 1, 2, 3, 4],
>      [ 5, 6, 7, 8],
>      [ 9,10,11,12],
>      [13,14,15,16]]
> 
> I've already borrowed code from the Matrix class to select sub-arrays
> of this array:
> 
> a1 = [[1,2],[5,6]]
> b1 = [[3,4],[7,8]]
> a2 = [[9,10],[13,14]]
> b2 = [[11,12],[15,16]]
> 
> 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]

Perhaps it would be better if you specify exactly what you want, with all
the numbers and brackets in place. Here is a first cut based on what you
have said:

#!/usr/bin/ruby -w

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

c1 = [a1,b1].transpose.flatten
d1 = [a2,b2].transpose.flatten

p c1,d1

[1, 2, 3, 4, 5, 6, 7, 8]
[9, 10, 11, 12, 13, 14, 15, 16]

-- 
Paul Lutus
http://www.arachnoid.com