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# PetscSectionSetClosurePermutation
Set the dof permutation for the closure of each cell in the section, meaning clPerm[newIndex] = oldIndex. 
## Synopsis
```
#include "petscsection.h"   
PetscErrorCode PetscSectionSetClosurePermutation(PetscSection section, PetscObject obj, PetscInt depth, IS perm)
```
Not Collective


## Input Parameters

- ***section -*** The `PetscSection`
- ***obj     -*** A `PetscObject` which serves as the key for this index (usually a `DM`)
- ***depth   -*** Depth of points on which to apply the given permutation
- ***perm    -*** Permutation of the cell dof closure





## Notes
The specified permutation will only be applied to points at depth whose closure size matches the length of perm.  In a
mixed-topology or variable-degree finite element space, this function can be called multiple times at each depth for
each topology and degree.

This approach assumes that (depth, len(perm)) uniquely identifies the desired permutation; this might not be true for
exotic/enriched spaces on mixed topology meshes.


## See Also
 [PetscSection](sec_petscsection), `PetscSection`, `IS`, `PetscSectionGetClosurePermutation()`, `PetscSectionGetClosureIndex()`, `DMPlexCreateClosureIndex()`, `PetscCopyMode`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/section/interface/section.c.html#PetscSectionSetClosurePermutation">src/vec/is/section/interface/section.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex6.c.html">src/dm/impls/plex/tutorials/ex6.c</A><BR>


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