From: Christian Szegedy <szegedy@...>
Date: 2003-01-28T23:01:03+09:00
Subject: Re: Questions from a Ruby Newbie (file io and data structures)...

I haven't tested, but it should work.

a = []
IO.foreach { |l| l.split(",").each_with_index{ |s,i| (a[i] ||= []) << s } }