--- /dev/null
+## Copyright (C) 1995-2012 Friedrich Leisch
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} rectangle_sw (@var{n}, @var{b})
+## Rectangular spectral window. Subfunction used for spectral density
+## estimation.
+## @end deftypefn
+
+## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
+## Description: Rectangular spectral window
+
+function retval = rectangle_sw (n, b)
+
+ if (nargin != 2)
+ print_usage ();
+ endif
+
+ retval = zeros (n, 1);
+ retval(1) = 2 / b + 1;
+
+ l = (2:n)' - 1;
+ l = 2 * pi * l / n;
+
+ retval(2:n) = sin ((2/b + 1) * l / 2) ./ sin (l / 2);
+
+endfunction
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