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Question about Fourier transformation in Matlab
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[QUOTE="vela, post: 5650316, member: 221963"] You're selecting the wrong part of the DFT. You don't want coefficients 36 through 84. You have 660 months worth of samples, so ##X_k## (for ##k=0, 1, \dots, 330##) corresponds to a cycle that has an angular frequency of ##k\omega_0## where ##\omega_0=2\pi/660\text{ rad/month}##. What you want to do is determine the range of ##k## that corresponds to angular frequencies between ##2\pi/36\text{ rad/month}## and ##2\pi/84\text{ rad/month}##. [/QUOTE]
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Question about Fourier transformation in Matlab
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