petsc-3.4.4 2014-03-13

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
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages