petsc-3.12.5 2020-03-29

VecCreateGhost

Creates a parallel vector with ghost padding on each processor.

#include "petscvec.h"   
PetscErrorCode  VecCreateGhost(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv)

Collective

	comm	- the MPI communicator to use
	n	- local vector length
	N	- global vector length (or PETSC_DECIDE to have calculated if n is given)
	nghost	- number of local ghost points
	ghosts	- global indices of ghost points, these do not need to be in increasing order (sorted)

vv -the global vector representation (without ghost points as part of vector)

Use VecGhostGetLocalForm() to access the local, ghosted representation of the vector.

This also automatically sets the ISLocalToGlobalMapping() for this vector.

advanced