create the same MPIAdj matrix on a subcommunicator containing only processes owning a positive number of rows
PetscErrorCode MatMPIAdjCreateNonemptySubcommMat(Mat A,Mat *B)
|A ||- original MPIAdj matrix
|B ||- matrix on subcommunicator, NULL on ranks that owned zero rows of A
This function is mostly useful for internal use by mesh partitioning packages that require that every process owns at least one row.
The matrix B should be destroyed with MatDestroy(). The arrays are not copied, so B should be destroyed before A is destroyed.
ImplementationsMatMPIAdjCreateNonemptySubcommMat_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c
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