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


## Input Parameters

- ***dm    -*** The `DM`
- ***label -*** The `DMLabel` defining the mesh region, or `NULL` for the entire mesh



## Output Parameters

- ***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`





## Note
If a non-`NULL` label is given, but there is no `PetscDS` on that specific label,
the `PetscDS` for the full domain (if present) is returned. Returns with
fields = `NULL` and ds = `NULL` if there is no `PetscDS` for the full domain.


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

## Level
advanced

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


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