Computes a real-to-complex dimension-2 fast Fourier transform. Transforms a 2-D input array rx[nfft][n1] of nfft n1 real numbers to a 2-D output array cy[nfft/2+1][2 n1] of (nfft/2+1) n1 complex numbers. @param sign the sign (1 or -1) of the exponent used in the FFT. @param n1 the 1st dimension of a
(int sign, int n1, float[][] rx, float[][] cy)
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