# VecCreateGhostBlock
Creates a parallel vector with ghost padding on each processor. The indicing of the ghost points is done with blocks. 
## Synopsis
```
#include "petscvec.h"   
PetscErrorCode VecCreateGhostBlock(MPI_Comm comm, PetscInt bs, PetscInt n, PetscInt N, PetscInt nghost, const PetscInt ghosts[], Vec *vv)
```
Collective


## Input Parameters

- ***comm -*** the MPI communicator to use
- ***bs -*** the block size
- ***n -*** local vector length
- ***N -*** global vector length (or PETSC_DECIDE to have calculated if n is given)
- ***nghost -*** number of local ghost blocks
- ***ghosts -*** global indices of ghost blocks, counts are by block, not by individual index, 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.

n is the local vector size (total local size not the number of blocks) while nghost
is the number of blocks in the ghost portion, i.e. the number of elements in the ghost
portion is bs*nghost




## See Also
 `VecCreateSeq()`, `VecCreate()`, `VecDuplicate()`, `VecDuplicateVecs()`, `VecCreateMPI()`,
`VecGhostGetLocalForm()`, `VecGhostRestoreLocalForm()`,
`VecCreateGhostWithArray()`, `VecCreateMPIWithArray()`, `VecCreateGhostBlockWithArray()`


## Level
advanced

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/tutorials/ex14f.F90.html">src/vec/vec/tutorials/ex14f.F90.html</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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
