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opDFT2
 opDFT2  Two-dimensional fast Fourier transform (DFT).
 
    opDFT2(M,N) creates a two-dimensional normalized Fourier transform
    operator for matrices of size M by N. Input and output of the
    matrices is done in vectorized form.
 
    opDFT2(M,N,CENTERED) just like opDFT2(M,N), but with components
    shifted to have to zero-frequency component in the center of the
    spectrum, if the CENTERED flag is set to true.