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# PetscSectionCreate
Allocates a `PetscSection` and sets the map contents to the default. 
## Synopsis
```
#include "petscsection.h"   
PetscErrorCode PetscSectionCreate(MPI_Comm comm, PetscSection *s)
```
Collective


## Input Parameters

- ***comm -*** the MPI communicator
- ***s    -*** pointer to the section





## Notes
Typical calling sequence
```none
       PetscSectionCreate(MPI_Comm,PetscSection *);!
       PetscSectionSetNumFields(PetscSection, numFields);
       PetscSectionSetChart(PetscSection,low,high);
       PetscSectionSetDof(PetscSection,point,numdof);
       PetscSectionSetUp(PetscSection);
       PetscSectionGetOffset(PetscSection,point,PetscInt *);
       PetscSectionDestroy(PetscSection);
```


The `PetscSection` object and methods are intended to be used in the PETSc `Vec` and `Mat` implementations. The indices returned by the `PetscSection` are appropriate for the kind of `Vec` it is associated with. For example, if the vector being indexed is a local vector, we call the section a local section. If the section indexes a global vector, we call it a global section. For parallel vectors, like global vectors, we use negative indices to indicate dofs owned by other processes.


## See Also
 [PetscSection](sec_petscsection), `PetscSection`, `PetscSectionSetChart()`, `PetscSectionDestroy()`, `PetscSectionCreateGlobalSection()`

## Level
beginner

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