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 - CSR format row pointers for the connectivity of the dofs

• adjncy - CSR format column pointers for the connectivity of the dofs

• 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

KSP: Linear System Solvers, 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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