Fourier Transform, Fft, Fast Fourier Transform, Algorithms, Mathematics.
the size of our data which is 288 in this example. Mathematically: Where the last reduction follows from the fact that: If we take the absolute values of both F(v) and F(T-v), they will be equal although the imaginary parts differ by a negative sign. i.e. abs(F(v)) = abs(F(T-v)) Thus the plot is