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opDFT
 opDFT  Fast Fourier transform (DFT).
 
    opDFT(M) create a unitary one-dimensional discrete Fourier
    transform (DFT) for vectors of length M.
 
    opDFT(M,CENTERED), with the CENTERED flag set to true, creates a
    unitary DFT that shifts the zero-frequency component to the center
    of the spectrum.