Computes a complex-to-complex fast Fourier transform. Transforms a 1-D input array cx[2 nfft] of nfft complex numbers to a 1-D output array cy[2 nfft] of nfft complex numbers. @param sign the sign (1 or -1) of the exponent used in the FFT. @param cx the input array. @param cy the output array.
(int sign, float[] cx, float[] cy)
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