#include <petscksp.h> PetscErrorCode KSPFETIDPSetPressureOperator(KSP ksp, Mat P)Collective on KSP
| ksp | - the FETI-DP Krylov solver | |
| P | - the linear operator to be preconditioned, usually the mass matrix. |
Notes: The operator can be either passed in a) monolithic global ordering, b) pressure-only global ordering or c) interface pressure ordering (if -ksp_fetidp_pressure_all false). In cases b) and c), the pressure ordering of dofs needs to satisfy pid_1 < pid_2 iff gid_1 < gid_2 where pid_1 and pid_2 are two different pressure dof numbers and gid_1 and gid_2 the corresponding id in the monolithic global ordering.