Hi friends, I think I have not explained my problem properly in my last email. Actually, I am doing biGlobal linear stability analysis with HalfMode, which yields eigenmode on a 2D plane. Now I want to reconstruct the eigenmode in 3D, which will require inverse Fourier transform. I have check one of the examples in the manual for the Floquet analysis of a of flow past a cylinder. There is a plot for the eigenmode at z=2 [Figure 10.25 of the manual]. Thus, I want to know which module is used to convert the eigenmode in 3D. I would be highly thankful for the comments on this issue. With regards Abhishek Kumar --------------------------------------------------------------------------------------- Abhishek Kumar Research Associate Applied Mathematics Research Centre Coventry University, Coventry CV1 5FB The United Kingdom Email # ac7600@coventry.ac.uk, abhishek.kir@gmail.com ---------------------------------------------------------------------------------------