[petsc-users] PCASM and restriction operators

[Jed Brown]

They are your subdomains, plus some number of levels of overlap (1 by
default).  You can call PCASMGetLocalSubdomains which gives you ISs for
the subdomain, then use it to insert ones into a zeroed global vector.
Plotting that will give you the characteristic function of the
subdomain which you can visualize using whatever tools you like.

Karin&NiKo <niko.karin at gmail.com> writes:

> Dear PETSc team,
>
> I would like to understand the ASM implemented in PETSc. In order to build
> the link between the theory and the implementation, I would like to know if
> it is possible to print or export the restriction and prolongation
> operators. I have seen in the code (asm.c) that they are VecScatter objects
> and I wonder if their is a way to visualize them.
>
> Thanks in advance,
> Nicolas
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