From: Jean-Julien Fleck <jeanjulien.fleck@...>
Date: 2010-04-06T22:02:02+09:00
Subject: Re: Find a set of common elements from a multi-dimensional array

Hello,

2010/4/6 Shreyas Satish <shreyas.satish@gmail.com>:
> I have a multi-dimensional array ; a=[[2,3,4],[1,3,4],[1,2],[1,2,3,4]]
> i've to compare all the 4 sub-arrays and get common elements.Next,take 3
> subarrays at a time and get common elements.then take 2 sub arrays at a
> time and get common elements.

Have a look to Array#combination to group your subarrays into
comparison sets and then use the Set class (require 'set') and it's
intersection instance method to get the common elements.

Cheers,

-- 
JJ Fleck
PCSI1 Lycée Kléber