How can I compute fourier coefficient?

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Ghazal Hnr
Ghazal Hnr 2017-3-10
评论： Ghazal Hnr 2017-3-10
Hi I have a pulse and I want to compute the first 20 fourier coefficient of it. Would anyone help me to do this?

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Image Analyst
Image Analyst 2017-3-10
f = fft(yourSignal);
f20 = f(1:20); % Extract first 20 coefficients.

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