:orphan:
# DMPlexCreateOverlapLabelFromLabels
Compute a label indicating what overlap points should be sent to new processes 
## Synopsis
```
#include "petscdmplex.h"   
#include "petscdmlabel.h"  
PetscErrorCode DMPlexCreateOverlapLabelFromLabels(DM dm, PetscInt numLabels, const DMLabel label[], const PetscInt value[], PetscInt numExLabels, const DMLabel exLabel[], const PetscInt exValue[], PetscSection rootSection, IS rootrank, PetscSection leafSection, IS leafrank, DMLabel *ovLabel)
```
Collective


## Input Parameters

- ***dm          -*** The `DM`
- ***numLabels   -*** The number of labels to draw candidate points from
- ***label       -*** An array of labels containing candidate points
- ***value       -*** An array of label values marking the candidate points
- ***numExLabels -*** The number of labels to use for exclusion
- ***exLabel     -*** An array of labels indicating points to be excluded, or `NULL`
- ***exValue     -*** An array of label values to be excluded, or `NULL`
- ***rootSection -*** The number of leaves for a given root point
- ***rootrank    -*** The rank of each edge into the root point
- ***leafSection -*** The number of processes sharing a given leaf point
- ***leafrank    -*** The rank of each process sharing a leaf point



## Output Parameter

- ***ovLabel     -*** `DMLabel` containing remote overlap contributions as point/rank pairings





## Note
The candidate points are only added to the overlap if they are adjacent to a shared point


## See Also
 `DMPLEX`, `DMPlexCreateOverlapLabel()`, `DMPlexGetAdjacency()`, `DMPlexDistributeOwnership()`, `DMPlexDistribute()`

## Level
developer

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


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