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# DMPlexStratifyMigrationSF
Rearrange the leaves of a migration sf for stratification. 
## Synopsis
```
#include "petscdmplex.h"   
#include "petscdmlabel.h"  
PetscErrorCode DMPlexStratifyMigrationSF(DM dm, PetscSF sf, PetscSF *migrationSF)
```

## Input Parameters

- ***dm          -*** The DM
- ***sf          -*** A star forest with non-ordered leaves, usually defining a DM point migration



## Output Parameter

- ***migrationSF -*** A star forest with added leaf indirection that ensures the resulting DM is stratified





## Note
This lexicographically sorts by (depth, cellType)


## See Also
 `DMPLEX`, `DMPlexPartitionLabelCreateSF()`, `DMPlexDistribute()`, `DMPlexDistributeOverlap()`

## Level
developer

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