On Mon, 10 Dec 2007 16:54:08 -0800, mosi wrote:
> Python matrices are usually defined with numpy scipy array or similar.
> e.g.
>>>> matrix1 = [[1, 2], [3, 4], [5, 6]]
> I would like to have easier way of defining matrices, for example:
>>>> matrix = [1, 2; 3, 4; 5, 6]
>
>>>> matrix =
> [ 1, 2;
> 3, 4;
> 5, 6;]
>
> Any ideas how could this be done? The ";" sign is reserved, the "[ ]" is
> used for lists.
You could have some class `Matrix` with a constructor taking a string, as
in ``Matrix("[1, 2; 3, 4; 5, 6]")``. A very naive parser could just strip
trailing/leading brackets and all spaces, split on ';', split again on
',', done.
> Also, how to program custom operations for this new "class?" matrix ???
>
> For example:
>>>> matrix + 2
> [ 3, 4;
> 5, 6;
> 7, 8;]
>
> Possibly with operator overloading?
Yes, by simply overloading __add__ et al. See http://docs.python.org/ref/
specialnames.html for details (certainly, "Emulating numeric types"
should be interesting to you).
> I appreciate all your comments, directions, pointers. mosi
Cheers,
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