From: seepee <see@...>
Date: 2006-12-21T21:40:08+09:00
Subject: Matrix class for ruby? -example

On Thu, 21 Dec 2006 09:12:47 +0200, seepee wrote:

> Does anyone know of a functional Matrix math class for ruby that could
> multiply, add and substract 3x2 or larger matrices.
> 
> The matrix.rb that is in Ruby API cannot multiply anything larger than 2x2
> matrices, which makes it useless for 2D or 3D graphics (for instance).
> 
> SP

Problem:
go to terminal, and type "irb" or "irb1.8"

>require 'matrix' #or require >rubylibrarypath/matrix.rb
>p Matrix[ [25, 93, 33], [0, -1, 66] ] * Matrix[ [1, 53, 33], [1, -21, 77]

ExceptionForMatrix::ErrDimensionMismatch: Matrix dimension mismatch
        from /usr/lib/ruby/1.8/matrix.rb:466:in `*' from (irb):4

??