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# PCBDDCSetLocalAdjacencyGraph
Set adjacency structure (CSR graph) of the local degrees of freedom.
## Synopsis
```
#include "petscpc.h"
PetscErrorCode PCBDDCSetLocalAdjacencyGraph(PC pc, PetscInt nvtxs, const PetscInt xadj[], const PetscInt adjncy[], PetscCopyMode copymode)
```
Not collective
## Input Parameters
- ***pc -*** the preconditioning context.
- ***nvtxs -*** number of local vertices of the graph (i.e., the number of local dofs).
- ***xadj, adjncy -*** the connectivity of the dofs in CSR format.
- ***copymode -*** supported modes are `PETSC_COPY_VALUES`, `PETSC_USE_POINTER` or `PETSC_OWN_POINTER`.
## Note
A dof is considered connected with all local dofs if xadj[dof+1]-xadj[dof] == 1 and adjncy[xadj[dof]] is negative.
## See Also
`PCBDDC`, `PetscCopyMode`
## Level
intermediate
## Location
src/ksp/pc/impls/bddc/bddc.c
## Examples
src/ksp/ksp/tutorials/ex59.c
## Implementations
PCBDDCSetLocalAdjacencyGraph_BDDC in src/ksp/pc/impls/bddc/bddc.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/bddc/bddc.c)
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