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annotate scripts/plot/sombrero.m @ 16491:b10a23fe80bb

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doc: Tweak docstrings of functions changed for Texinfo 5.0 compatibility. * scripts/audio/wavread.m, scripts/miscellaneous/getappdata.m, scripts/miscellaneous/license.m, scripts/miscellaneous/ver.m, scripts/plot/daspect.m, scripts/plot/graphics_toolkit.m, scripts/plot/pbaspect.m, scripts/polynomial/splinefit.m, scripts/set/union.m, scripts/signal/freqz.m: Improve docstring wording.
author Rik <rik@octave.org>
date Wed, 10 Apr 2013 22:43:30 -0700
parents befb99c0c72f
children 64e7bb01fce2
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1993-2012 John W. Eaton
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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} {} sombrero (@var{n})
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21 ## Produce the familiar three-dimensional sombrero plot using @var{n}
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22 ## grid lines. If @var{n} is omitted, a value of 41 is assumed.
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23 ##
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24 ## The function plotted is
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25 ##
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26 ## @example
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27 ## z = sin (sqrt (x^2 + y^2)) / (sqrt (x^2 + y^2))
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28 ## @end example
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29 ## @seealso{surf, meshgrid, mesh}
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30 ## @end deftypefn
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32 ## Author: jwe
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34 function [x, y, z] = sombrero (n = 41)
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36 if (nargin > 2)
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37 print_usage ();
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38 elseif (n <= 1)
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39 error ("sombrero: number of grid lines N must be greater than 1");
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40 endif
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42 tx = linspace (-8, 8, n)';
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43 ty = tx;
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44 [xx, yy] = meshgrid (tx, ty);
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45 r = sqrt (xx .^ 2 + yy .^ 2) + eps;
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46 tz = sin (r) ./ r;
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47 if (nargout == 0)
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48 surf (tx, ty, tz);
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49 box ("off");
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50 else
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51 x = tx;
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52 y = ty;
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53 z = tz;
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54 endif
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55
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56 endfunction
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59 %!demo
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60 %! clf;
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61 %! colormap ('default');
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62 %! sombrero ();
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64 ## Test input validation
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65 %!error sombrero (1,2,3)
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66 %!error <N must be greater than 1> sombrero (1)
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