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Hi, I suggest to try to understand the basics of the Fourier transform.
Anyway, from a signal of N samples, you'll get a Fourier transform of N samples.
The first component is the constant component (signal offset). The second component is the sinusoidal function which has a frequency of 1/N, or a period of N. The middle component (at N/2) denotes the frequency of 1/2, or a periode of 2. After, you'll get the mirror of the spectrum.
Note that the Fourier spectrum is complex.
