[petsc-users] FEM, unassembled matrix based GMRES or CG method ?

[Matthew Knepley]

On Fri, Aug 17, 2012 at 7:51 PM, Kyungjoo Kim <iamkyungjoo at gmail.com> wrote:

> Dear PETSc experts:
>
> I am wondering if PETSc support Krylov methods without assembling
> FE-matrices.
> I googled and checked example codes but was not able to find out an answer
> for this
>

Yes, use MATSHELL for your matrix.

   Matt


> Thank you.
>
> Kyungjoo
>
>


-- 
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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