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annotate scripts/signal/triangle_sw.m @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 4c8a2e4e0717
children a1dbe9d80eee
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1 ## Copyright (C) 1995, 1996, 1997 Friedrich Leisch
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} triangle_sw (@var{n}, @var{b})
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21 ## Triangular spectral window. Subfunction used for spectral density
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22 ## estimation.
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23 ## @end deftypefn
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25 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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26 ## Description: Triangular spectral window
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28 function retval = triangle_sw (n, b)
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30 retval = zeros(n,1);
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31 retval(1) = 1 / b;
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33 l = (2:n)' - 1;
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34 l = 2 * pi * l / n;
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36 retval(2:n) = b * (sin (l / (2*b)) ./ sin (l / 2)).^2;
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38 endfunction
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