[petsc-users] MatElemDiv

Matthew Knepley knepley at gmail.com
Thu Feb 11 10:06:59 CST 2010

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.


> 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
-- Norbert Wiener
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