Pierre Jolivet <[email protected]> writes: > Hello, > Has there been any follow-up on this > https://lists.mcs.anl.gov/pipermail/petsc-users/2015-January/024020.html > <https://lists.mcs.anl.gov/pipermail/petsc-users/2015-January/024020.html>? > Given a 3x3 MatNest A = [A_00,0,0 ; 0,A_11,0 ; 0,0,A_22], I’d like to setup a > two-way fieldsplit coupling [A_00,0 ; 0,A_11] and [A_22] but I can’t figure > out the proper options.
Are you looking for a Schur split or additive/multiplicative? > Jed, in this answer > https://lists.mcs.anl.gov/pipermail/petsc-users/2015-January/023993.html > <https://lists.mcs.anl.gov/pipermail/petsc-users/2015-January/023993.html>, > you recommend not to use MatNest. What would you recommend instead? See src/snes/examples/tutorials/ex28.c for my preferred approach.
