MatMPIAdjCreateNonemptySubcommMat#
create the same MATMPIADJ 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 Parameter#
A - original
MATMPIADJmatrix
Output Parameter#
B - matrix on subcommunicator,
NULLon MPI processes that own zero rows ofA
Note#
The matrix B should be destroyed with MatDestroy(). The arrays are not copied, so B should be destroyed before A is destroyed.
Developer Note#
This function is mostly useful for internal use by mesh partitioning packages, such as ParMETIS that require that every process owns at least one row.
See Also#
Level#
developer
Location#
Implementations#
MatMPIAdjCreateNonemptySubcommMat_MPIAdj() in src/mat/impls/adj/mpi/mpiadj.c
Index of all Mat routines
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Index of all manual pages