:orphan:
# DMGetAuxiliaryVec
Get the auxiliary vector for region specified by the given label and value, and equation part 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetAuxiliaryVec(DM dm, DMLabel label, PetscInt value, PetscInt part, Vec *aux)
```
Not Collective


## Input Parameters

- ***dm     -*** The `DM`
- ***label  -*** The `DMLabel`
- ***value  -*** The label value indicating the region
- ***part   -*** The equation part, or 0 if unused



## Output Parameter

- ***aux    -*** The `Vec` holding auxiliary field data





## Note
If no auxiliary vector is found for this (label, value), (NULL, 0, 0) is checked as well.


## See Also
 [](ch_dmbase), `DM`, `DMSetAuxiliaryVec()`, `DMGetNumAuxiliaryVec()`, `DMGetAuxiliaryLabels()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/interface/dm.c.html#DMGetAuxiliaryVec">src/dm/interface/dm.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex12.c.html">src/snes/tutorials/ex12.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex7.c.html">src/snes/tutorials/ex7.c</A><BR>


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


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