petsc-3.11.4 2019-09-28
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MatMPIAdjCreateNonemptySubcommMat

 create the same MPIAdj matrix on a subcommunicator containing only processes owning a positive number of rows

Synopsis

#include "petscmat.h" 
PetscErrorCode MatMPIAdjCreateNonemptySubcommMat(Mat A,Mat *B)
Collective

Input Arguments

A -original MPIAdj matrix

Output Arguments

B -matrix on subcommunicator, NULL on ranks that owned zero rows of A

Note

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.

See Also

MatCreateMPIAdj()

Level

developer

Location

src/mat/impls/adj/mpi/mpiadj.c

Implementations

MatMPIAdjCreateNonemptySubcommMat_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c

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