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Genetic Fourier Transform Update Link / Bad Link? 
GFT (Generic Fourier Transform) is a Fortran 95 interface which defines a set of only four generic routines to compute 1D, 2D, 3D and multiple 1D forward/backward complex and real FFTs.
Submitted Jul 19, 2002
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netlib/FFTPACK Update Link / Bad Link? 
FFTPACK is a package of Fortran subprograms for the fast Fourier transform of periodic and other symmetric sequences. It includes complex, real, sine, cosine, and quarter-wave transforms. Reference P.N. Swarztrauber, Vectorizing the FFTs, in Parallel Computations (G. Rodrigue, ed.), Academic Press, 1982, pp. 51--83. Developer Paul N. Swarztrauber, National Center for Atmospheric Research, Boulder, CO.
Submitted Jul 07, 1999
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ECMFFT Update Link / Bad Link? 
ECMFFT is a library purchased from the European Centre for Medium-Range Weather Forcasting (ECMWF), for computing the fast Fourier transform of real periodic sequences. Its primary user entries SET99 and FFT991 are Fortran-callable and figure heavily in NCAR's Community Climate Models. Routine SET99 is a setup routine, and routine FFT991 is referred to as a "multiple transform" because it transforms multiple sequences within a single array, and the operative vector length is the number of sequences transformed by a given call.
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GPFA Update Link / Bad Link? 
GPFA is a library purchased from the European Centre for Medium-Range Weather Forcasting (ECMWF), for computing the fast Fourier transform of complex periodic sequences. Its primary user entries SETGPFA and GPFA are Fortran-callable. Routine SETGPFA is a setup routine, and routine GPFA is referred to as a "multiple transform" because it transforms multiple sequences within a single array, and the operative vector length is the number of sequences transformed by a given call.
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