From: Adriano Mitre <adriano.mitre@...>
Date: 2009-07-27T06:40:46+09:00
Subject: Re: cartesian product of arrays

Nanyang Zhan wrote:
> well, then can anyone tell me which one is the best?

Unfortunately, these methods use too much memory, storing the whole
cartesian product Array in memory even its elements are needed only one
at a time. A nicer alternative is the Cartesian module:

"The Cartesian module provide methods for the calculation of the
cartesian producted between two enumberable objects. It can also be
easily mixed in into any enumberable class, i.e. any class with
Enumerable module mixed in."

The Cartesian module is available at
http://rubyforge.org/projects/cartesian/
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