Todd Benson wrote:
> On Mon, Aug 4, 2008 at 10:24 PM, Marcio Braga <mbraga0001 / gmail.com> 
> wrote:
>> undefined method '[]=' for Matrix[[11, 12], [21, 22]]:Matrix
>> (NoMethodError)
> 
> You have to open the class and define the method as in the example...
> 
> class Matrix
>   def []=(i, j, x)
>     @rows[i][j] = x
>   end
> end
> 
> Todd

Perfect! Thank you.

Quick comment: Why this method is not already pre-defined in the Matrix 
class ?
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