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# PetscSectionGetMaxDof
Return the maximum number of degrees of freedom on any point in the `PetscSection` 
## Synopsis
```
#include "petscsection.h"   
PetscErrorCode PetscSectionGetMaxDof(PetscSection s, PetscInt *maxDof)
```
Not Collective


## Input Parameter

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



## Output Parameter

- ***maxDof -*** the maximum dof





## Notes
The returned number is up-to-date without need for `PetscSectionSetUp()`.

This is the maximum over all points of the sum of the number of dof in the unnamed default field plus all named fields. This is equivalent to
the maximum over all points of the value returned by `PetscSectionGetDof()` on this MPI process


## Developer Notes
The returned number is calculated lazily and stashed.

A call to `PetscSectionInvalidateMaxDof_Internal()` invalidates the stashed value.

`PetscSectionInvalidateMaxDof_Internal()` is called in `PetscSectionSetDof()`, `PetscSectionAddDof()` and `PetscSectionReset()`

It should also be called every time `atlasDof` is modified directly.


## See Also
 [PetscSection](sec_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionSetDof()`, `PetscSectionAddDof()`, `PetscSectionCreate()`

## Level
intermediate

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


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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)