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annotate scripts/signal/bartlett.m @ 13818:a05e5db7b94e

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have some fun with waitbar demo #2
author John W. Eaton <jwe@octave.org>
date Fri, 04 Nov 2011 14:33:44 -0400
parents 984359717d71
children 72c96de7a403
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fd0a3ac60b0e update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1995-2011 Andreas Weingessel
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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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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} bartlett (@var{m})
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21 ## Return the filter coefficients of a Bartlett (triangular) window of
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22 ## length @var{m}.
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23 ##
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24 ## For a definition of the Bartlett window, see e.g., A. V. Oppenheim &
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895d49a7e36a [docs] "Discrete-Time Signal Processing" => @cite{Discrete-Time Signal Processing}
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25 ## R. W. Schafer, @cite{Discrete-Time Signal Processing}.
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26 ## @end deftypefn
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27
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28 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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29 ## Description: Coefficients of the Bartlett (triangular) window
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31 function c = bartlett (m)
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32
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33 if (nargin != 1)
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34 print_usage ();
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35 endif
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36
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37 if (! (isscalar (m) && (m == fix (m)) && (m > 0)))
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38 error ("bartlett: M has to be an integer > 0");
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39 endif
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40
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41 if (m == 1)
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42 c = 1;
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43 else
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44 m = m - 1;
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45 n = fix (m / 2);
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46 c = [2*(0:n)/m, 2-2*(n+1:m)/m]';
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47 endif
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48
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49 endfunction
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51 %!assert (bartlett (1), 1);
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52 %!assert (bartlett (2), zeros (2,1));
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53 %!assert (bartlett (16), fliplr (bartlett (16)));
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54 %!assert (bartlett (15), fliplr (bartlett (15)));
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55 %!test
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56 %! N = 9;
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57 %! A = bartlett (N);
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58 %! assert (A (ceil (N/2)), 1);
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60 %!error bartlett ();
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61 %!error bartlett (0.5);
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62 %!error bartlett (-1);
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63 %!error bartlett (ones(1,4));