/*---------------------------------------------------------------------------------
  Title: UserFs.txt
  Purpose: Define F(s)
  Author: P. Kano, M. Brio
  Date: May 9, 2011
  
  Comment: 
  User defines the function Fs to invert here.
  F(s) Must be written in a way that it can be implemented in C/C++ or CUDA-C.
  This may require explicit definition of functions of complex variables.
  
  This function is included directly into the CUDA kernal wfnsampleFS.cu
  A device function for F(s) could also be used.
 ----------------------------------------------------------------------------------*/
  
  /*Example A:
   F(s) = 1/(s*s)
   f(t) = t
  ----------------------------------------*/
  Fs = make_cuDoubleComplex(1.0,0.0);
  Fs = cuCdiv(Fs,s);
  Fs = cuCdiv(Fs,s);
  
  