[Numpy-discussion] Does Unreasonable Matrix Behavior affectScipy Sparse

Dinesh B Vadhia dineshbvadhia@hotmail....
Fri Apr 25 15:46:52 CDT 2008


I posted this on the scipy list:

I have a working program with b=Ax, where A is a large sparse matrix.  However, I need the int8 support in the sparse library to utilize much larger matrices.  I managed to get hold of a numpy svn 5066 and scipy svn 4167 build, and b=Ax now returns garbage results.  Nothing was changed in the program except replacing getrow with .todense() and I checked these to make sure the right rows were being picked up.

Wish I could point out where exactly the problem lies but there was no Traceback just the wrong results but it can safely be assumed it is with the numpy/scipy matrix support.

Any ideas?


----- Original Message ----- 
From: Alan G Isaac 
To: Discussion of Numerical Python 
Sent: Friday, April 25, 2008 11:03 AM
Subject: Re: [Numpy-discussion] Does Unreasonable Matrix Behavior affectScipy Sparse

On Fri, 25 Apr 2008, Dinesh B Vadhia apparently wrote:
> where A is sparse using scipy.sparse. ... I'm now using 
> the latest svn and b = Ax 

1. Please post a small example.
2. Do you have the *very* latest SVN (post r5084)?

Alan Isaac

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