[petsc-users] Convert MatNest to MatAIJ

[Thomas Witkowski]

Am 10.10.2012 18:57, schrieb Dmitry Karpeev:
> There is this commit from last summer: 
> http://petsc.cs.iit.edu/petsc/petsc-dev/rev/5289fd118d48
> It's untested, but I pushed it back then hoping someone could beat it 
> into shape.
> I also have a patch that eliminates ISAllGather() in favor of PetscSF 
> operations, but that's even
> less tested (if such a thing is possible).  I can clean it up and 
> push, if somebody wants to play with it.
I think, this will help me to make something working for my case, thanks!

Thomas
>
> Dmitry.
>
>
>         Barry
>
>
>
>
>     >
>     > On Oct 10, 2012 8:45 AM, "Thomas Witkowski"
>     <thomas.witkowski at tu-dresden.de
>     <mailto:thomas.witkowski at tu-dresden.de>> wrote:
>     > 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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