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.
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