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