[petsc-users] snes_type aspin without DA example

[Barry Smith]

  You are not missing anything. The petsc4py stub for SNESNASMSetSubdomains() has not been written. You could add it by adding to
src/petsc4py/PETSc/SNES.pyx and src/petsc4py/PETSc/petscsnes.pxi and then make a merge request  https://petsc.org/release/developers/contributing/ to get it into PETSc.

> On Jun 22, 2023, at 1:54 PM, Karin&NiKo <niko.karin at gmail.com> wrote:
> 
> Dear PETSc team,
> 
> I would like to play with aspin-type nonlinear solvers. I have found several tests like snes/tutorials/ex19.c but they all use DA, which I don't want to use since I need to stick at the algebraic level.
> Then, I started looking at petsc4py/demo/ode/heat.py and tried to set up things.
> Unfortunately, I get the error "DM has no default decomposition defined.  Set subsolves manually with SNESNASMSetSubdomains()" which, I think, I do understand.
> But I do not find any implementation of the SNESNASMSetSubdomains in petsc4py. 
> Am I missing something ? 
> Thanks,
> Nicolas

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