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

[Dominik Szczerba]

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Have there been any studies in that matter? Anything I should cite to
justify such choice?

Dominik

Barry Smith wrote:
>    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:
> 
> 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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