The function extracts features from functional data based on the fast fourier
transform. For more details refer to stats::fft.
extractFDAFourier(trafo.coeff = "phase")
Specifies which transformation of the complex frequency domain
representation should be calculated as a feature representation.
Must be one of “amplitude” or “phase”.
Default is “phase”.
Other fda_featextractor: extractFDAFPCA,