[petsc-users] removing small entries from a sparse matrix

[Matthew Knepley]

This does not exist, but the right place would be to modify the behavior of
MAT_IGNORE_ZERO_ENTRIES
to use a tolerance.

   Matt

On Tue, Dec 29, 2009 at 4:38 PM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

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> Is it possible to remove small (subject to given tol) entries in my
> sparse coefficient matrix after the values have been set (added)? I have
> a highly convective problem where I ask myself what's better, keep lots
> of explicit zeros to rescue constant non-zero pattern or eliminate the
> near-zero entries.
> Dominik
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-- 
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
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