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Need help understanding FFT

  1. Aug 23, 2008 #1
    I got some data which is in equal time stamps. When I do the Fast Fourier Transform for the data using matlab I get the graph below. Now I understand how to do the fast fourier transform but I have no idea what information the FFT graph gives.

    I am confused as to what the peak at 1 represents and what else I can gather from the FFT?

    Attached Files:

  2. jcsd
  3. May 13, 2009 #2
    I would be so grateful if you could help me with
    numerical fourier of bessel function using FFT (with c if possible )or just the idea
    also why we should replaced f0 by 1/2(f0 +fn) before calculatin DFT
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