# DMSetRegionDS
Set the `PetscDS` for a given mesh region, defined by a `DMLabel` 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMSetRegionDS(DM dm, DMLabel label, IS fields, PetscDS ds)
```
Collective on dm


## Input Parameters

- ***dm     -*** The `DM`
- ***label  -*** The `DMLabel` defining the mesh region, or NULL for the entire mesh
- ***fields -*** The IS containing the `DM` field numbers for the fields in this `PetscDS`, or NULL for all fields
- ***prob   -*** The `PetscDS` defined on the given region



## Note
If the label has a `PetscDS` defined, it will be replaced. Otherwise, it will be added to the `DM`. If the `PetscDS` is replaced,
the fields argument is ignored.




## See Also
 `DMGetRegionDS()`, `DMSetRegionNumDS()`, `DMGetDS()`, `DMGetCellDS()`

## Level
advanced

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


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