Using the FFT
The FFT in MSP
FFTW is a free, open-source library that provides a set of fast C routines for computing the DFT using a common programming API across a wide variety of computer platforms and operating systems.
is a C language interface but a Fortran interface is provided as well (and perhaps other ``ports'' have been made).
library implementation is optimized for each specific computer architecture and/or processor.
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Gary P. Scavone