fftpack4_test, a C code which calls fftpack4() to compute Fast Fourier Transforms.
All the changes made by Andrew Fernandes from the original FFTPACK fall under the following BSD-style open-source license:
Copyright (c) 2005, Andrew Fernandes (andrew@fernandes.org);
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fftpack4, a C code which implements the Fast Fourier Transform (FFT) by Paul Swarztrauber and Dick Valent, translated by Andrew Fernandes;