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Is R's fft() output normalized or not? In other words, do I have to normalize the output first before computing the phase angle using atan2()?

On a related point, does does anyone know what phase shift is used in R's fft() function?

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Normalization is multiplication of the whole output by a real number. Multiplying a complex number by a real number has no effect on the phase of the complex number. You don't need to normalize if all you need is the phase.

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  • $\begingroup$ Oh my goodness. Of course. I am a freaking idiot. $\endgroup$ – Brash Equilibrium Dec 5 '11 at 21:05

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