[petsc-users] Solving only for certain rows

[Matthew Knepley]

On Tue, Feb 2, 2016 at 8:35 AM, Orxan Shibliyev <orxan.shibli at gmail.com>
wrote:

> After hole cutting my unstructured mesh has some active and
> inactive/fringe cells. I solve equations on active/computational/field
> cells only. Some of the active cells are neighbors of inactive cells. If I
> prepare petsc matrix including all cells then the solver does not converge
> due unchanging values of inactive cells. How can I tell Petsc not to solve
> for certain rows? If I make all cells active then the solver converge so I
> am sure that there is no problem related to solver.
>

Leave them out of the matrix?

  Matt

-- 
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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