petsc3.13.4 20200801
MatCreateMPIAdj
Creates a sparse matrix representing an adjacency list. The matrix does not have numerical values associated with it, but is intended for ordering (to reduce bandwidth etc) and partitioning.
Synopsis
#include "petscmat.h"
PetscErrorCode MatCreateMPIAdj(MPI_Comm comm,PetscInt m,PetscInt N,PetscInt *i,PetscInt *j,PetscInt *values,Mat *A)
Collective
Input Parameters
 comm   MPI communicator

 m   number of local rows

 N   number of global columns

 i   the indices into j for the start of each row

 j   the column indices for each row (sorted for each row).
The indices in i and j start with zero (NOT with one).

 values   [optional] edge weights

Output Parameter
A the matrix
Notes
This matrix object does not support most matrix operations, include
MatSetValues().
You must NOT free the ii, values and jj arrays yourself. PETSc will free them
when the matrix is destroyed; you must allocate them with PetscMalloc(). If you
call from Fortran you need not create the arrays with PetscMalloc().
Should not include the matrix diagonals.
If you already have a matrix, you can create its adjacency matrix by a call
to MatConvert, specifying a type of MATMPIADJ.
Possible values for MatSetOption()  MAT_STRUCTURALLY_SYMMETRIC
See Also
MatCreate(), MatConvert(), MatGetOrdering()
Level
intermediate
Location
src/mat/impls/adj/mpi/mpiadj.c
Examples
src/mat/tutorials/ex11.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages