COMPUTE FFT

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COMPUTE FFT

            [SIC\]COMPUTE OutVar FFT+|FFT- InVar [REAL]

        FFT+ performs Direct Fast Fourier Transform, while FFT- performs Inverse
        Fast Fourier Transform.

        Command  accepts  REAL  or COMPLEX variables. OutVar is a 2-D array with
        second dimension equals 2, storing respectively the Real  and  Imaginary
        part  of  the  (complex)  output Fourier transform. By default, InVar is
        like OutVar, but if parameter REAL is specified InVar is a 1-D array.