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annotate scripts/signal/triangle_sw.m @ 4019:c6d7ae9fcdb9

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[project @ 2002-08-05 16:42:36 by jwe]
author jwe
date Mon, 05 Aug 2002 16:42:36 +0000
parents 38c61cbf086c
children 4c8a2e4e0717
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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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} triangle_sw (@var{n}, @var{b})
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22 ## Triangular 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: Triangular spectral window
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29 function retval = triangle_sw (n, b)
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31 retval = zeros(n,1);
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32 retval(1) = 1 / b;
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34 l = (2:n)' - 1;
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35 l = 2 * pi * l / n;
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37 retval(2:n) = b * (sin (l / (2*b)) ./ sin (l / 2)).^2;
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39 endfunction
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