VecCreateGhost#

Creates a parallel vector with ghost padding on each processor.

Synopsis#

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

Collective

Input Parameters#

  • comm - the MPI communicator to use

  • n - local vector length

  • N - global vector length (or PETSC_DETERMEINE 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)

Output Parameter#

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

Notes#

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

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

See Also#

Vectors and Parallel Data, Vec, VecType, VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost()

Level#

advanced

Location#

src/vec/vec/impls/mpi/pbvec.c

Examples#

src/vec/vec/tutorials/ex14f.F90
src/vec/vec/tutorials/ex9.c
src/vec/vec/tutorials/ex9f.F90

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