This is the home page of libkww, a small numeric library that provides the cosine and sine Fourier transform of Kohlrausch's stretched exponential function exp(-t^beta).

This Fourier transform is also known as the Kohlrausch-Williams-Watts function. In condensed-matter physics, it is often used to describe frequency-domain measurements of relaxation processes.

Joachim Wuttke:
Laplace–Fourier Transform of the Stretched Exponential Function: Analytic Error Bounds, Double Exponential Transform, and Open-Source Implementation “libkww”.
Algorithms 5, 604-628 (2012)

Author: Joachim Wuttke, Jülich Centre for Neutron Science (2009-12).
Citation: Please cite the Algorithms paper indicated above.
Download: http://apps.jcns.fz-juelich.de/src/kww/
License: GNU General Public License (GPL) version 3 or higher
Manual: kww(3)

Python:: see bindings/python/README in the source distribution.