how to use fourier transform to analyze time series data?

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I have an time series signal.I want to calculate first,second,third harmonic curves according to the following research paper, using fourier transform.how to do it?please help me.thanks!

Answers (1)

Henric Rydén
Henric Rydén on 19 May 2014
Edited: Henric Rydén on 21 May 2014
Hi,
your question is not very clear but look up the fft command

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