[petsc-users] Convert MatNest to MatAIJ

[Jed Brown]

The best way, by far, is to assemble the matrix as AIJ if that is what you
want to use. See MatGetLocalSubMatrix and SNES ex28. Using MATNEST should
he a run-time choice.
On Oct 10, 2012 8:30 AM, "Thomas Witkowski" <thomas.witkowski at tu-dresden.de>
wrote:

> Is there a fast way to convert a MatNest to a MatAIJ? I tried to use
> MatConvert, but it seems that this convert is not yet implemented. As I
> need this functionality to factorize the nested matrix with MUMPS, is there
> any better way than to extract the nested matrices, iterate over all rows
> of these matrices and use MatSetValues to add them again to the final
> MatAIJ?
>
> Thomas
>
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