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Matlab-Plot Power Spectrum of time series

  1. Aug 18, 2010 #1
    Hi all,

    and thank you for reading/responding to my thread.I have a problem which involves time series and its power spectra.

    Some background:
    I have an 10.000xN matrix(called matr) whose columns are individual time series with real data values and I want to plot their power spectra against frequency.These time series where generated by an iterative map which involved a sin function with omega=0.1. Plotting freq versus power I might be able to see if any harmonics are present.

    Below are the steps I take in Matlab:

    y=fft(matr) % get the fourier transform of the matrix
    y=(abs(y)).^2 %this is the power spectra

    Is the above right?

    Also I'm puzzled as to what frequency range I should use.
    seems right?

    Any suggestions?
    Thank you all
  2. jcsd
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