[petsc-users] Convert MatNest to MatAIJ

Jed Brown jedbrown at mcs.anl.gov
Wed Oct 10 08:33:28 CDT 2012

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>

> 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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