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#

Output Parameter#

  • 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#

Matrices, Mat, MATMPIADJ, MatCreateMPIAdj()

Level#

developer

Location#

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

Implementations#

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

Edit on GitLab

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