Aspects


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Fftw

FFTW, "The Fastest Fourier Transform in The West", is a C library which implements discrete Fourier Transforms

Gsl

The GNU Scientific Library (GSL) is a numerical library for C and C++ programmers.



Others

Example

You can have a look at this speed performance benchmark from fftw which suggests that gsl is about 3-4 times slower than fftw 3

from question  

Is FFTW significantly better than GSL for real transform calculations?

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