48   Vec             x, v1, v2, v3, v4;  in main()  local
143   PetscCall(VecCreate(PETSC_COMM_WORLD, &v1));  in main()
145   PetscCall(VecSetSizes(v1, m, PETSC_DECIDE));  in main()
146   PetscCall(VecSetFromOptions(v1));  in main()
147   PetscCall(VecDuplicate(v1, &v2));  in main()
183       PetscCall(MatMult(P, x, v1));  in main()
184       PetscCall(MatMult(A_tmp, v1, v2)); /* v2 = A*P*x */  in main()
185       PetscCall(MatMult(C, x, v1));      /* v1 = C*x   */  in main()
186       PetscCall(VecAXPY(v1, none, v2));  in main()
187       PetscCall(VecNorm(v1, NORM_1, &norm_tmp));  in main()
237       PetscCall(MatMult(P, x, v1));  in main()
238       PetscCall(MatMult(A, v1, v2)); /* v2 = A*P*x */  in main()
259   PetscCall(VecDestroy(&v1));  in main()