From: Victor Reyes <victor.reyes@...>
Date: 2007-10-20T10:59:20+09:00
Subject: Re: 2 dimensional array

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I just wanted to play with Magic Squares and other multidimensional arrays.

Thank you for the info about matrix.

On 10/19/07, Todd Benson <caduceass@gmail.com> wrote:
>
> 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
>
>

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