[petsc-users] Convert MatNest to MatAIJ

[Thomas Witkowski]

You are right. But what if a have a MATNEST and i must convert it to 
MATAIJ. Any better way than what I wrote in my first mail?

Thomas

Am 10.10.2012 15:33, schrieb 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 
> <mailto: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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