14   Vec         x, y, z, input, output;  in main()  local
30   PetscCall(VecCreate(PETSC_COMM_WORLD, &input));  in main()
31   PetscCall(VecSetSizes(input, PETSC_DECIDE, N));  in main()
32   PetscCall(VecSetFromOptions(input));  in main()
33   PetscCall(VecSetRandom(input, rdm));  in main()
34   PetscCall(VecDuplicate(input, &output));  in main()
49   PetscCall(InputTransformFFT(A, input, x));  in main()
57   PetscCall(VecAssemblyBegin(input));  in main()
58   PetscCall(VecAssemblyEnd(input));  in main()
62   PetscCall(VecView(input, PETSC_VIEWER_STDOUT_WORLD));  in main()
65   PetscCall(VecAXPY(output, -1.0, input));  in main()