:orphan:
# VecGetSubVector
Gets a vector representing part of another vector 
## Synopsis
```
#include "petscvec.h"   
PetscErrorCode VecGetSubVector(Vec X, IS is, Vec *Y)
```
Collective


## Input Parameters

- ***X -*** vector from which to extract a subvector
- ***is -*** index set representing portion of `X` to extract



## Output Parameter

- ***Y -*** subvector corresponding to `is`





## Notes
The subvector `Y` should be returned with `VecRestoreSubVector()`.
`X` and must be defined on the same communicator

This function may return a subvector without making a copy, therefore it is not safe to use the original vector while
modifying the subvector.  Other non-overlapping subvectors can still be obtained from X using this function.

The resulting subvector inherits the block size from `is` if greater than one. Otherwise, the block size is guessed from the block size of the original `X`.


## See Also
 [](ch_vectors), `Vec`, `IS`, `VECNEST`, `MatCreateSubMatrix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/interface/rvector.c.html#VecGetSubVector">src/vec/vec/interface/rvector.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex22.c.html">src/dm/tutorials/ex22.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex81.c.html">src/ksp/ksp/tutorials/ex81.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex63.c.html">src/snes/tutorials/ex63.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex70.c.html">src/snes/tutorials/ex70.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex77.c.html">src/ts/tutorials/ex77.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/tutorials/ex44.c.html">src/vec/vec/tutorials/ex44.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx.html#VecGetSubVector_MPIKokkos">VecGetSubVector_MPIKokkos in src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/nest/vecnest.c.html#VecGetSubVector_Nest">VecGetSubVector_Nest in src/vec/vec/impls/nest/vecnest.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx.html#VecGetSubVector_SeqKokkos">VecGetSubVector_SeqKokkos in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/interface/rvector.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)