[petsc-users] Passing a near nullspace through fieldsplit

[Tristan Konolige via petsc-users]

Hello All,

I’m trying to pass a near nullspace through PCFieldSplit (schur) to GAMG (on 
the schur complement matrix). If I use MatSetNearNullSpace on my matrix, the 
near nullspace isn’t propagated through to GAMG. If I attach the near nullspace 
to the IS used to define the splits, it still doesn’t propagate through to 
GAMG. Am I missing the correct way to do this?

Thanks,
Tristan Konolige