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