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# VecMPISetGhost
Sets the ghost points for an MPI ghost vector 
## Synopsis
```
#include "petscvec.h"   
PetscErrorCode VecMPISetGhost(Vec vv, PetscInt nghost, const PetscInt ghosts[])
```
Collective


## Input Parameters

- ***vv -*** the MPI vector
- ***nghost -*** number of local ghost points
- ***ghosts -*** global indices of ghost points, these do not need to be in increasing order (sorted)





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

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

You must call this AFTER you have set the type of the vector (with` VecSetType()`) and the size (with `VecSetSizes()`).


## See Also
 [](ch_vectors), `Vec`, `VecType`, `VecCreateSeq()`, `VecCreate()`, `VecDuplicate()`, `VecDuplicateVecs()`, `VecCreateMPI()`,
`VecGhostGetLocalForm()`, `VecGhostRestoreLocalForm()`, `VecGhostUpdateBegin()`,
`VecCreateGhostWithArray()`, `VecCreateMPIWithArray()`, `VecGhostUpdateEnd()`,
`VecCreateGhostBlock()`, `VecCreateGhostBlockWithArray()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/pbvec.c.html#VecMPISetGhost">src/vec/vec/impls/mpi/pbvec.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/tutorials/ex9.c.html">src/vec/vec/tutorials/ex9.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/impls/mpi/pbvec.c)


[Index of all Vec routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)  
