From: Len Lawrence <lcl@...>
Date: 2008-03-22T23:04:53+09:00
Subject: Re: Cloning arrays

On Sat, 22 Mar 2008 14:31:51 +0100, Robert Klemme wrote:

> On 22.03.2008 14:10, Len Lawrence wrote:
>> 
> A solution would be to do
> 
> e = xygrid['page'].map do |z|
>    z = z.map { |d| d *= f }
>    z[2] -= 2.0; z[3] -= 2.0
>    z
> end
> 
> Or you can do a deep copy via the usual Marshal idiom
> 
> e = Marshal.load(Marshal.dump(xygrid['page']))
> 
> Kind regards
> 
> 	robert

Thanks Robert.  So the issue was fundamental.  I had not yet come to
appreciate the meaning of 'shallow copy' or come to terms with map or
Marshal.  The Tk connection here is actually irrelevant.  

That has been a great help.

Len