add_cplx                Add Additional Representations to Fourier
                        Coefficients
add_l2nm                Add L2 Norm and Squared L2 Norm of Frequency
                        Dimensions
can_repr                Manage Representations of a 'fftab' Object
cross_spec              Compute the Cross-Spectrum (Cross FFT)
fftab                   Perform FFT and IFFT with Tidy Results
fourier_frequencies     Compute Fourier Frequencies
get_fx                  Extract Fourier Coefficients and Components
get_rect                Extract Rectangular or Polar Components
has_cplx                Check Representations of a 'fftab' Object
phase_diff              Compute Phase Difference and Maximum
                        Correlation Between Two Signals
plot.fftab              Plot the modulus of FFT results
to_cplx                 Convert a 'fftab' Object Between
                        Representations
