Prime-factor complex-to-complex multiple FFT. Performs multiple transforms across the 2nd (slowest) dimension of a 2-D array. In this version, z[0:nfft-1][0,2,4,...] contains the real parts, and z[0:nfft-1][1,3,5,...] contains the imaginary parts. @param sign the sign of the exponent in the Fourier
(int sign, int n1, int nfft, float[][] z)
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