Computes a complex-to-real dimension-2 fast Fourier transform. Transforms a 2-D input array cx[nfft/2+1][2 n1] of (nfft/2+1) n1 complex numbers to a 2-D output array ry[nfft][n1] of nfft n1 real 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[][] cx, float[][] ry)
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