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Fast Fourier Transforms

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	Fast Fourier Transform code - http://home.comcast.net/~kmbtib/index.html By James Van Buskirk.
	Jörgs Useful and Ugly FFT page - http://www.jjj.de/fft/fftpage.html Code and links in Fortran and C for the Fast Fourier Transform.
	Pipelined phase-rotation FFT - http://www.cs.cmu.edu/afs/cs.cmu.edu/project/iwarp/member/fx/public/www/phase1.html By David O'Halloran. The Welchel phase-rotation FFT is a new form of the fast Fourier transform (FFT) that replaces data movement at runtime with equivalent multiplications by precomputed constants. The result is an FFT that is easy to pipeline.
	Ernst Mayer - http://hogranch.com/mayer/resume.html Fortran 90 codes for Fast Fourier Transforms and Discrete Weighted Transforms, for use in number theory research.
	A Short Demonstration Version of the FFT - http://members.tripod.com/michaelgellis/dsp/pgm05.html Source code of a subroutine to transform (forward or inverse) a one-dimensional complex array in place.

Romo's Free Software - http://romo661.free.fr/ OFFT, "Outrageously Fast Fortran Transpose", and BFFFT, "Blazingly Fast FFT, 2-Dimensional Vectorized Fast Fourier Transform" written in Fortran 90.

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