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freeware
 FFTW (Fastest Fourier Transform in the West) Home Page
FFTW is a C subroutine library, available for FREE, for computing the Discrete Fourier Transform (DFT) in one or more dimensions, of both real and complex data, and of arbitrary input size.
The web site includes download information, documentation, upgrade information, and related links.
Further, the authors provide benchmark results of their routines.
preview:
http://www.fftw.org/
4/20/1999
Tags: fft
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