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# PetscSectionSetUp
Calculate offsets based upon the number of degrees of freedom for each point in preparation for use of the `PetscSection` 
## Synopsis
```
#include "petscsection.h"   
PetscErrorCode PetscSectionSetUp(PetscSection s)
```
Not Collective


## Input Parameter

- ***s -*** the `PetscSection`





## Notes
If used, `PetscSectionSetPermutation()` must be called before this routine.

`PetscSectionSetPointMajor()`, cannot be called after this routine.


## See Also
 [PetscSection](sec_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionSetPermutation()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex7.c.html">src/dm/impls/plex/tutorials/ex7.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex7.c.html">src/snes/tutorials/ex7.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11.c.html">src/ts/tutorials/ex11.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11_sa.c.html">src/ts/tutorials/ex11_sa.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/section/interface/section.c)


[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)