[SciPy-user] [Sparse matrix library] csr_matrix and column sum
David Cournapeau
david@ar.media.kyoto-u.ac...
Sun Apr 27 23:56:22 CDT 2008
Dinesh B Vadhia wrote:
> I'm using the svn. There is no Traceback error but the results are
> incorrect based on previous results. Here is ouput from print
> statements that might help:
>
> > import numpy
> > import scipy
> > from scipy import sparse
>
> > colSum = scipy.asmatrix(scipy.zeros((1,J), dtype=numpy.float))
> > colSum = A.sum(0) # A is a csr_matrix
I don't know if this is intended, but the first line has no effect
(scipy.asmatrix: the call is wasteful because colSum will be assigned to
A.sum(0) just after). We need the A matrix.
David
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