10   Vec         x, y, z, input, output;  in main()  local
26   PetscCall(VecCreate(PETSC_COMM_WORLD, &input));  in main()
27   PetscCall(VecSetSizes(input, PETSC_DECIDE, N));  in main()
28   PetscCall(VecSetFromOptions(input));  in main()
33   PetscCall(VecSetRandom(input, rdm));  in main()
36   PetscCall(VecDuplicate(input, &output));  in main()
55   PetscCall(InputTransformFFT(A, input, x));  in main()
68   PetscCall(VecAssemblyBegin(input));  in main()
69   PetscCall(VecAssemblyEnd(input));  in main()
76   PetscCall(VecAXPY(output, -1.0, input));  in main()
83   PetscCall(VecDestroy(&input));  in main()