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.ka...@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
