[Numpy-discussion] Scipy 0.6.0 to 0.7.0, sparse matrix change

Fadhley Salim Fadhley.Salim at uk.calyon.com
Mon Jun 15 06:47:48 EDT 2009

I'm trying to track down a numerical discrepancy in our proejct. We
noticed that a certain set of results are different having upgraded from
scipy 0.6.0 to 0.7.0. 

The following item from the Scipy change-log is our current number-one
suspect. Could anybody who knows suggest what was actually involved in
the change which I have highlighted with stars below? 


Sparse Matrices
The handling of diagonals in the ``spdiags`` function has been changed.
It now agrees with the MATLAB(TM) function of the same name.
*** Numerous efficiency improvements to format conversions and sparse
matrix arithmetic have been made.  Finally, this release contains
numerous bugfixes. ***
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