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@sympatico.ca Newsgroups: comp.lang.python,comp.lang.python.announce To: "numpy-discussion" numpy-discussion@lists.sourceforge.net; "SciPy Discussion List" scipy-user@scipy.net Cc: "Huaiyu Zhu" hzhu@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

PyMatrix provides access to basic matrix arithmetic, using Python and 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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