fftpack51_test, a FORTRAN90 code which calls fftpack51(), which computes the Fast Fourier Transform, using double precision arithmetic.
Licensed under the GNU General Public License (GPL).
Copyright (C) 1995-2004, Scientific Computing Division,
University Corporation for Atmospheric Research.
fftpack51, a FORTRAN90 code which computes Fast Fourier Transforms (FFTs), using double precision arithmetic, by Paul Swarztrauber and Dick Valent;