# [Numpy-discussion] PyMatrix: Announcement

Sebastian Haase haase at msg.ucsf.edu
Tue Dec 9 13:38:01 CST 2003

```Hi Colin,
We are interested in using your PyMatrix packages (It' numarray not Numeric,
right?).
First though, someone in my lab had the following concern:
What if I actually need the element-wise multiplication ?
(In other words: The Matlab .* operator)

I understand that python does not allow to invent new operator symbols.
How about multiplying a Matrix with a Numarray ?
Is it possible to have a 'numarray view' of a Matrix object ? (I'm thinking
of two differently typed objects sharing one "value-memory space", so that
essentially the type determines which multiplication is being used ...)

Thanks,
Sebastian Haase

----- Original Message -----
From: "Colin J. Williams" <cjw at sympatico.ca>
Newsgroups: comp.lang.python,comp.lang.python.announce
To: "numpy-discussion" <numpy-discussion at lists.sourceforge.net>; "SciPy
Discussion List" <scipy-user at scipy.net>
Cc: "Huaiyu Zhu" <hzhu at users.sourceforge.net>
Sent: Monday, November 24, 2003 5:17 AM
Subject: [Numpy-discussion] PyMatrix: Announcement

> PyMatrix is available for test and review.
>      http://www3.sympatico.ca/cjw
>
> numarray.
>
> Examples:
>           A * B                   =>               the product of
> matrices A and B
>           A.I                       =>               the inverse of matrix
A
>           A.EVectors           =>               the eigenvectors of A
>           A.var(0)               =>               the variances of the
> columns of A
>           (a.T*a).I * a.T*b  =>               the solution (x) for a *
> x  =  b,
>                                                         where a is a
> matrix and b a column vector
>
> This package was developed on a Windows XP.  I would appreciate
> comments, particularly with respect to usage on other systems.
>
> Colin W.
>
>
>
>
>
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