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_DETERMINE 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/ex9.c
src/vec/vec/tutorials/ex9f.F90
src/snes/tutorials/ex42.c

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Index of all Vec routines
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Index of all manual pages