From: Todd Benson <caduceass@...>
Date: 2007-10-20T06:36:24+09:00
Subject: Re: 2 dimensional array

On 10/19/07, Victor Reyes <victor.reyes@gmail.com> wrote:
> Sorry guys, I am very slow.
> In conclusion. how would the following be represented in Ruby?
> It is a 3x3 matrix.
>
>   11 76 -34  31 -66 71  -1 63 34
> Thank you

It depends on what you want to do.  If you just want to represent it
as a nested array, you could...

my_matrix = [[11, 76, -34], [31, -66, 71], [-1 63 34]]

As you notice, this is still 2-dimensional.


For math type matrix functionality, there is the matrix standard library...

require 'matrix'

which includes methods that return a manipulated matrix (represented
by the Matrix object), like inverse, rank, determinant, algebraic
functions, etc.  I believe you can also go back and forth between
nested arrays and Matrix objects using Matrix#to_a and
Matrix#[](*rows).  Somebody else might be able to fill you in better.

You can find documentation for that under the standard library docs at
http://www.ruby-doc.org.

hth,
Todd