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# DMLabelPropagateBegin
Setup a cycle of label propagation 
## Synopsis
```
#include "petscdmlabel.h"   
#include "petscsection.h"   
PetscErrorCode DMLabelPropagateBegin(DMLabel label, PetscSF sf)
```
Collective


## Input Parameters

- ***label -*** The `DMLabel` to propagate across processes
- ***sf    -*** The `PetscSF` describing parallel layout of the label points





## See Also
 `DMLabel`, `DM`, `DMLabelPropagateEnd()`, `DMLabelPropagatePush()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/dmlabel.c.html#DMLabelPropagateBegin">src/dm/label/dmlabel.c</A>


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


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