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Computing a power spectrum

  1. Dec 9, 2008 #1
    This is more of a data analysis question than a mathematics question so feel free to move it to wherever you think it is most likely to be answered.

    I have some time series data that looks (just by eye) like it should have several peaks in its power spectrum.

    However, when I compute the power spectrum, the function I get is nearly identically zero. It has a very large power value for the first frequency point and then 0 everywhere else.

    Has anyone else encountered this problem? Any ideas what could be happening? I'm pretty sure that the method I am using to calculate the power spectrum is (nearly) good since I can get good results on sine waves and the like. It just doesn't seem to work on any actual data.
  2. jcsd
  3. Dec 9, 2008 #2
    oh, nevermind I figured it out!
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