:orphan:
# DMGetRegionNumDS
Get the `PetscDS` for a given mesh region, defined by the region number 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetRegionNumDS(DM dm, PetscInt num, DMLabel *label, IS *fields, PetscDS *ds, PetscDS *dsIn)
```
Not Collective


## Input Parameters

- ***dm  -*** The `DM`
- ***num -*** The region number, in [0, Nds)



## Output Parameters

- ***label  -*** The region label, or `NULL`
- ***fields -*** The `IS` containing the `DM` field numbers for the fields in this `PetscDS`, or `NULL`
- ***ds     -*** The `PetscDS` defined on the given region, or `NULL`
- ***dsIn   -*** The `PetscDS` for input in the given region, or `NULL`





## See Also
 [](ch_dmbase), `DM`, `DMGetRegionDS()`, `DMSetRegionDS()`, `DMGetDS()`, `DMGetCellDS()`

## Level
advanced

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex23.c.html">src/snes/tutorials/ex23.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex53.c.html">src/ts/tutorials/ex53.c</A><BR>


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


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