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# DMPlexGetTransitiveClosure
Return the points on the transitive closure of the in-edges or out-edges for this point in the DAG 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexGetTransitiveClosure(DM dm, PetscInt p, PetscBool useCone, PetscInt *numPoints, PetscInt *points[])
```
Not Collective


## Input Parameters

- ***dm      -*** The `DMPLEX`
- ***p       -*** The mesh point
- ***useCone -*** `PETSC_TRUE` for the closure, otherwise return the star



## Input/Output Parameter

- ***points -*** The points and point orientations, interleaved as pairs [p0, o0, p1, o1, ...];
if `NULL` on input, internal storage will be returned, otherwise the provided array is used



## Output Parameter

- ***numPoints -*** The number of points in the closure, so points[] is of size 2*`numPoints`





## Note
If using internal storage (points is `NULL` on input), each call overwrites the last output.


## Fortran Note
The `numPoints` argument is not present in the Fortran binding since it is internal to the array.


## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMPlexRestoreTransitiveClosure()`, `DMPlexCreate()`, `DMPlexSetCone()`, `DMPlexSetChart()`, `DMPlexGetCone()`

## Level
beginner

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex11.c.html">src/dm/impls/plex/tutorials/ex11.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plex.c.html#DMPlexGetTransitiveClosure_Internal">DMPlexGetTransitiveClosure_Internal in src/dm/impls/plex/plex.c</A><BR>


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