7   Mat         C, C1, C2, CU;  in main()  local
75   PetscCall(MatCreate(PETSC_COMM_WORLD, &C1));  in main()
76   PetscCall(MatSetSizes(C1, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));  in main()
77   PetscCall(MatSetFromOptions(C1));  in main()
78   PetscCall(MatSeqAIJSetPreallocation(C1, 1, NULL));  in main()
79   PetscCall(MatMPIAIJSetPreallocation(C1, 1, NULL, 1, NULL));  in main()
84     PetscCall(MatSetValues(C1, 1, &i, 1, &j, &v, ADD_VALUES));  in main()
86   PetscCall(MatAssemblyBegin(C1, MAT_FINAL_ASSEMBLY));  in main()
87   PetscCall(MatAssemblyEnd(C1, MAT_FINAL_ASSEMBLY));  in main()
88   PetscCall(PetscObjectSetName((PetscObject)C1, "C1"));  in main()
89   PetscCall(MatViewFromOptions(C1, NULL, "-view"));  in main()
90   PetscCall(MatDuplicate(C1, MAT_COPY_VALUES, &CU));  in main()
93   PetscCall(MatAXPY(C1, 2.0, C, DIFFERENT_NONZERO_PATTERN));  in main()
95   PetscCall(MatGetInfo(C1, MAT_GLOBAL_SUM, &info));  in main()
97   PetscCall(MatViewFromOptions(C1, NULL, "-view"));  in main()
98   PetscCall(MatMultEqual(CU, C1, 10, &flg));  in main()
107   PetscCall(MatDuplicate(C1, MAT_COPY_VALUES, &CU));  in main()
118   PetscCall(MatAXPY(C1, 2.0, C2, SUBSET_NONZERO_PATTERN));  in main()
120   PetscCall(MatGetInfo(C1, MAT_GLOBAL_SUM, &info));  in main()
122   PetscCall(MatViewFromOptions(C1, NULL, "-view"));  in main()
123   PetscCall(MatMultEqual(CU, C1, 10, &flg));  in main()
145   PetscCall(MatDestroy(&C1));  in main()