petsc-3.12.5 2020-03-29

PCKSPGetKSP

Gets the KSP context for a KSP PC.

#include "petscksp.h" 
PetscErrorCode  PCKSPGetKSP(PC pc,KSP *ksp)

Not Collective but KSP returned is parallel if PC was parallel

pc -the preconditioner context

ksp -the KSP solver

You must call KSPSetUp() before calling PCKSPGetKSP().

If the PC is not a PCKSP object it raises an error

advanced