From: "Sci000 Lem." <sci000@...1.com>
Date: 2006-07-21T19:25:07+09:00
Subject: Re: recursive method and references

> Your pos array contains references to other arrays,
> and pos.dup is a shallow copy, thus pos2 contains refs
> to the same sub-arrays as pos.  Any changes made via
> access to pos2 affects the same sub-arrays as viewed
> from pos.
> 
> Clear as mud? 9^)
> 
> Cheers
> Chris

Thank you for the answer, I didn’t know that the subarrays in Ruby are 
just referenced to the whole array, so I was wondering why it don’t work 
(normally I solve this kind of problems in Mercury, and that’s 
completely different)
I rewrote the lines which built pos as following:
arr.length.times{arr[0].length.times{pos.push(0)}}
and everything works properly!

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