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Multi-Component or Single-Component: Are there more than one type of signal within your recording multiple tones at multiple frequencies moving in different directions? This technique allows you to get the instantaneous phase lag between two signals.

From what I've read, it seems you want the amplitude and phase of this function in the frequency domain.

For this example, load invertedPendulumArray.

For most signals that I have tried, a supper signal with 1000000 samples has the best output.

You should compute the FFT of the full signal, not of the first 256 samples.

how often the signal repeats itself every second.

Then do an circular fftshift before the FFT.

The desired outcome should show a phase shift at 10 and 15 for waves 2 and 3 respectively.

Metrology and Measurement Systems, Vol.

Frequency Domain: Here you convert your signals into the frequency domain using fft or cpsd or whatever.

You converted some input value to radians according to your comments, so the radius of each polar plot represents radians for something.