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

[Barry Smith]

   Keep the small values. The nonzero structure will also help the  
convergence of most preconditioners.

    Barry

On Dec 29, 2009, at 4:38 PM, Dominik Szczerba 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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