Computes a real-to-complex dimension-1 fast Fourier transform. Transforms a 2-D input array rx[n2][nfft] of n2 nfft real numbers to a 2-D output array cy[n2][nfft+2] of n2 (nfft/2+1) complex numbers. @param sign the sign (1 or -1) of the exponent used in the FFT. @param n2 the 2nd dimension of array
(int sign, int n2, float[][] rx, float[][] cy)
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