From: "(r.*n){2}" <perl2ruby@...>
Date: 2010-09-28T05:15:10+09:00
Subject: Re: copying a matrix.

On Sep 27, 3:47 pm, John Smith <edvele...@gmail.com> wrote:
> How can I create an array copy that
> does not reference the same object...
>
> I have tried this without luck.
>
> m2 = m.map { |e| e }
> m2[2][2]=2
>
> p m
> p m2
> --
> Posted viahttp://www.ruby-forum.com/.


m2 = m.dup
0.upto(m2.size - 1) { |i| m2[i] = m[i].dup; 0.upto(m2[i].size - 1) { |
j| m2[i][j] = m[i][j] } }
m2[2][2] = 100
p m
p m2

[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[[1, 2, 3], [4, 5, 6], [7, 8, 100]]