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FFT for one 1*N Green function in MATLAB

  1. Aug 8, 2015 #1
    I have a 1×N Green function in energy domain. I want to use the FFT (fast fourier transform) for this Green function in MATLAB. But this function is non-periodic. Could you help me about this? How can I change the energy interval to convert Green function as a periodic function?
     
  2. jcsd
  3. Aug 11, 2015 #2

    f95toli

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    I am not sure I understand what you are trying to do. Could you use zero-padding?
     
  4. Aug 11, 2015 #3
    I defined zero matrix with zeros command in the binging of the program and calculate the Green function in energy domain then I converted the Green function to periodic function using for loop. Is it true=?
     
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