# In "Analyzing Cyclical Data with FFT" example, how the frequency was calculated?

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Muhamed Sewidan
on 4 Dec 2020

Commented: Paul Hoffrichter
on 4 Dec 2020

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### Accepted Answer

Paul Hoffrichter
on 4 Dec 2020

If n is even, the following is equivalent to your code:

f = linspace(2/n, 1, n/2) * maxfreq;

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Paul Hoffrichter
on 4 Dec 2020

The frequency (in Hz, cycles per second) is very arbitrary depending upon the applications. If talking about radio frequencies, both the min and max frequencies are regulated in every country so that in a small geographical region, two radio stations will not collide with each other.

Although a radio station's frequency is a specific number, there is also a frequency region surrounding this central frequency. For example, if the station's carrier frequency, Fc, is is playing music whose frequecies can go up to 20KHz, then there will be a band of frequencies often from Fc - 20KHz ... Fc + 20KHz, which is a 40KHz bandwidth. So that station will be assigned at least that 40KHz (and probably more) centered on Fc.

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