From: Frantisek ZACEK <czechripper@...>
Date: 2008-08-18T06:53:05+09:00
Subject: Re: Matrix: Need help to understand this behavior

On Sun, Aug 17, 2008 at 4:53 PM, Marcio Braga <mbraga0001@gmail.com> wrote:
> Zacek and all: how to duplicate a matrix that has elements that are also
> matrix ?
> For example:
>
> a = [[1]]
> b = a.dup
> puts a.object_id
> puts b.object_id
> puts a[0].object_id   # the same object
> puts b[0].object_id   # the same object
> b[0][0] = 2 * b[0][0]
> p a
> p b
>
> So, matrix "a" and "b" are different objects but each internal matrix
> element continue to be the same object. Do I need to duplicate each one
> ?
>
> Thank you
> Marcio
> --
> Posted via http://www.ruby-forum.com/.
>
>


I don't think there is a simple way to achieve that.
I would suggest:
a=[[1]]
b=a.dup.colllect { |e| e.dup }

-- 
Frantisek ZACEK (zacek_f) -- SRS 2008