:orphan:
# DMGetNumDS
Get the number of discrete systems in the `DM`
## Synopsis
```
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
PetscErrorCode DMGetNumDS(DM dm, PetscInt *Nds)
```
Not Collective
## Input Parameter
- ***dm -*** The `DM`
## Output Parameter
- ***Nds -*** The number of `PetscDS` objects
## See Also
[](ch_dmbase), `DM`, `DMGetDS()`, `DMGetCellDS()`
## Level
intermediate
## Location
src/dm/interface/dm.c
## Examples
src/ts/tutorials/ex53.c
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[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)