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# DMPlexGetSubpointIS
Returns an `IS` covering the entire subdm chart with the original points as data 
## Synopsis
```
#include "petscdmplex.h"    
#include "petscdmlabel.h"   
PetscErrorCode DMPlexGetSubpointIS(DM dm, IS *subpointIS)
```

## Input Parameter

- ***dm -*** The submesh `DM`



## Output Parameter

- ***subpointIS -*** The `IS` of all the points from the original mesh in this submesh, or `NULL` if this is not a submesh





## Note
This `IS` is guaranteed to be sorted by the construction of the submesh


## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMPlexCreateSubmesh()`, `DMPlexGetSubpointMap()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexsubmesh.c.html#DMPlexGetSubpointIS">src/dm/impls/plex/plexsubmesh.c</A>


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


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