[petsc-users] MatElemDiv

[Matthew Knepley]

On Thu, Feb 11, 2010 at 10:01 AM, John-Michael Fischer <fischej at umich.edu>wrote:

> This seems like a silly question, but is there a reason I cannot find a
> function for MatrixElementWiseDivide that would accept two matricies, M1 and
> M2 and perform element wise division?
>
> I can go through the process of getting local rows on each proc, doing the
> element by element division, etc... but it just seems like a perfect
> candidate for a built-in.
>

We do not have any Mat element-wise functions, since with sparse matrices
this might
be ill-defined with different non-zero patterns, as well as slow since the
result might have
a third nonzero pattern.

   Matt


> Thanks
> John-Michael Fischer
> University of Michigan
> Nuclear Engineering and Radiological Sciences




-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20100211/e527840d/attachment-0001.htm>