10   Mat         A, RHS, C, F, X, AX, spRHST;  in main()  local
113     PetscCall(MatMatMult(A, C, MAT_INITIAL_MATRIX, 2.0, &RHS));  in main()
114     PetscCall(MatMatSolve(F, RHS, X));  in main()
121     PetscCall(MatMatSolve(F, RHS, RHS));  in main()
123     PetscCall(MatAXPY(RHS, -1.0, C, SAME_NONZERO_PATTERN));  in main()
124     PetscCall(MatNorm(RHS, NORM_FROBENIUS, &norm));  in main()
130     PetscCall(MatZeroEntries(RHS));  in main()
133       PetscCall(MatSetValues(RHS, 1, &i, 1, &i, &v, INSERT_VALUES));  in main()
135     PetscCall(MatAssemblyBegin(RHS, MAT_FINAL_ASSEMBLY));  in main()
136     PetscCall(MatAssemblyEnd(RHS, MAT_FINAL_ASSEMBLY));  in main()
138     PetscCall(MatMatSolve(F, RHS, X));  in main()
146     PetscCall(MatAXPY(AX, -1.0, RHS, SAME_NONZERO_PATTERN));  in main()
183     PetscCall(MatAXPY(AX, -1.0, RHS, SAME_NONZERO_PATTERN));  in main()
208     PetscCall(MatDestroy(&RHS));  in main()