FFTShiftF shifts a buffer of floats.

MinMaxFloat returns the smallest and biggest samples in the buffer.

NewDFT returns the FFT result wrapped in a DFT struct.

TotalEnergy is the the sum of squared moduli See https://www.dsprelated.com/freebooks/mdft/Signal_Metrics.html.

DFT is the Discrete Fourier Transform representation of a signal https://en.wikipedia.org/wiki/Discrete_Fourier_transform.