Numeric Python, COM and Eigenvalues

[Mark Hammond]

Stefano wrote:
> Fernando Pérez <fperez528 at yahoo.com> wrote in message news:<aa1ft2$mn7$2 at peabody.colorado.edu>...
> 
>>Stefano wrote:
>>
>>
>>>I am working with Numpy and trying to create a COM server.
>>>I managed to call this server by Excel and get results like Inverse
>>>matrix or Cholesky decomposition but the server doesn't work as I ask
>>>for Eigenvalues/vectors (Excel does not respond anymore).
>>>Has anyone heard of a problem of this kind?
>>
>>Well, with zero example code and details provided that's going to be a hard 
>>one to get help on ;)
>>
>>Do you know for a fact you're feeding it a diagonalizable matrix? Does numpy 
>>compute the eigenvals/vects nicely if you test it with the same matrix on its 
>>own (not via excel)? Start testing with a symmetric 2x2 real matrix for which 
>>you can hand-compute the eigenvalues trivially, that might tell you where the 
>>problem is.
>>
>>Good luck,
>>
>>f.
> 
> 
> I have already tried with a trivial matrix via Shell.
> The same matrix makes Excel freeze.

Can you send the code for a trivial demo of the problem.  If you can get 
a 10 line script that fills a 2x2 matrix and hangs Excel it would help.

Mark.