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## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2005, 2006, 2007
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## This file is part of Octave.
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## Octave is free software; you can redistribute it and/or modify it
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## under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 3 of the License, or (at
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## your option) any later version.
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## Octave is distributed in the hope that it will be useful, but
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## WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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## General Public License for more details.
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## You should have received a copy of the GNU General Public License
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## along with Octave; see the file COPYING. If not, see
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## <http://www.gnu.org/licenses/>.
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## @deftypefn {Function File} {} hanning (@var{m})
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## Return the filter coefficients of a Hanning window of length @var{m}.
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## For a definition of this window type, see e.g. A. V. Oppenheim &
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## R. W. Schafer, "Discrete-Time Signal Processing".
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## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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## Description: Coefficients of the Hanning window
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function c = hanning (m)
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if (! (isscalar (m) && (m == round (m)) && (m > 0)))
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error ("hanning: m has to be an integer > 0");
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c = 0.5 - 0.5 * cos (2 * pi * (0 : m)' / m);