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annotate scripts/signal/rectangle_sw.m @ 7125:f084ba47812b

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[project @ 2007-11-08 02:29:23 by jwe]
author jwe
date Thu, 08 Nov 2007 02:29:24 +0000
parents a1dbe9d80eee
children fd0a3ac60b0e
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2005, 2007
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2 ## Friedrich Leisch
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} rectangle_sw (@var{n}, @var{b})
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22 ## Rectangular spectral window. Subfunction used for spectral density
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23 ## estimation.
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24 ## @end deftypefn
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26 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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27 ## Description: Rectangular spectral window
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29 function retval = rectangle_sw (n, b)
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31 if (nargin != 2)
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32 print_usage ();
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33 endif
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34
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35 retval = zeros (n, 1);
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36 retval(1) = 2 / b + 1;
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37
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38 l = (2:n)' - 1;
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39 l = 2 * pi * l / n;
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40
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41 retval(2:n) = sin ((2/b + 1) * l / 2) ./ sin (l / 2);
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42
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43 endfunction
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