7   Mat         C, A;  in main()  local
22   PetscCall(MatCreate(PETSC_COMM_WORLD, &C));  in main()
23   PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));  in main()
24   PetscCall(MatSetFromOptions(C));  in main()
25   PetscCall(MatSetUp(C));  in main()
31   PetscCall(MatGetOwnershipRange(C, &rstart, &rend));  in main()
35       PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES));  in main()
39   PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));  in main()
40   PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));  in main()
42   PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));  in main()
48   PetscCall(MatGetOwnershipRange(C, &rstart, &rend));  in main()
54   PetscCall(MatCreateSubMatrix(C, isrow, iscol, MAT_INITIAL_MATRIX, &A));  in main()
55   PetscCall(MatCreateSubMatrix(C, isrow, iscol, MAT_REUSE_MATRIX, &A));  in main()
59     PetscCall(MatDestroy(&C));  in main()
60     PetscCall(MatMatMult(A, A, MAT_INITIAL_MATRIX, PETSC_DETERMINE, &C));  in main()
61     PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));  in main()
67   PetscCall(MatDestroy(&C));  in main()