C

FFTW

"FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data (as well as of even/odd data, i.e. the discrete cosine/sine transforms or DCT/DST)."

Synopsis: 
C library for computing the discrete Fourier transform
Author(s): 
Frigo, Matteo and Johnson, Steven G.
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