# PCBDDCGetDirichletBoundaries
Get parallel `IS` for Dirichlet boundaries 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCBDDCGetDirichletBoundaries(PC pc, IS *DirichletBoundaries)
```
Collective


## Input Parameter

- ***pc -*** the preconditioning context



## Output Parameter

- ***DirichletBoundaries -*** index set defining the Dirichlet boundaries





## Note
The `IS` returned (if any) is the same passed in earlier by the user with `PCBDDCSetDirichletBoundaries()`


## See Also
 `PCBDDC`, `PCBDDCSetDirichletBoundaries()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/bddc/bddc.c.html#PCBDDCGetDirichletBoundaries">src/ksp/pc/impls/bddc/bddc.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/bddc/bddc.c.html#PCBDDCGetDirichletBoundaries_BDDC">PCBDDCGetDirichletBoundaries_BDDC in src/ksp/pc/impls/bddc/bddc.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/bddc/bddc.c)


[Index of all PC routines](index.md)  
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[Index of all manual pages](/docs/manualpages/singleindex.md)  
