annotate scripts/plot/mesh.m @ 16985:c9346014fed2

Validate inputs are real for mesh, meshc, meshz functions. Rename internal helper variables for greater clarity. * scripts/plot/mesh.m: Validate inputs are real. Use htmp for temporary handle. * scripts/plot/meshc.m: Validate inputs are real. Use htmp for temporary handle. * scripts/plot/meshz.m: Validate inputs are real. Use htmp for temporary handle. Use cellfun to replace for loop in input validation. Use oldax for saved axes handle.
author Rik <rik@octave.org>
date Sun, 14 Jul 2013 14:12:33 -0700
parents ddac88d32d6a
children 328b579e08e9
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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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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} mesh (@var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} mesh (@var{z})
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22 ## @deftypefnx {Function File} {} mesh (@dots{}, @var{c})
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23 ## @deftypefnx {Function File} {} mesh (@var{hax}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} mesh (@dots{})
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25 ## Plot a mesh given matrices @var{x}, and @var{y} from @code{meshgrid} and
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26 ## a matrix @var{z} corresponding to the @var{x} and @var{y} coordinates of
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27 ## the mesh. If @var{x} and @var{y} are vectors, then a typical vertex
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28 ## is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns of @var{z}
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29 ## correspond to different @var{x} values and rows of @var{z} correspond
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30 ## to different @var{y} values.
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31 ##
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32 ## The color of the mesh is derived from the @code{colormap}
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33 ## and the value of @var{z}. Optionally the color of the mesh can be
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34 ## specified independent of @var{z}, by adding a fourth matrix, @var{c}.
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35 ##
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36 ## The optional return value @var{h} is a graphics handle to the created
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37 ## surface object.
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38 ## @seealso{colormap, contour, meshgrid, surf}
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39 ## @end deftypefn
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41 ## Author: jwe
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42
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43 function h = mesh (varargin)
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45 if (! all (cellfun ("isreal", varargin)))
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46 error ("mesh: X, Y, Z, C arguments must be real");
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47 endif
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48
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49 newplot ();
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50
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51 htmp = surface (varargin{:});
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53 ax = get (htmp, "parent");
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55 set (htmp, "facecolor", "w");
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56 set (htmp, "edgecolor", "flat");
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58 if (! ishold ())
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59 set (ax, "view", [-37.5, 30],
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60 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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61 endif
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63 if (nargout > 0)
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64 h = htmp;
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65 endif
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66
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67 endfunction
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70 %!demo
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71 %! clf;
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72 %! x = logspace (0,1,11);
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73 %! z = x'*x;
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74 %! mesh (x, x, z, z.^2);
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75 %! xlabel 'X-axis';
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76 %! ylabel 'Y-axis';
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77 %! zlabel 'linear scale';
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79 %!demo
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80 %! clf;
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81 %! x = logspace (0,1,11);
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82 %! z = x'*x;
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83 %! mesh (x, x, z, z.^2);
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84 %! set (gca, 'zscale', 'log');
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85 %! xlabel 'X-axis';
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86 %! ylabel 'Y-axis';
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87 %! zlabel 'log scale';
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88 %! if (strcmp (get (gcf, '__graphics_toolkit__'), 'gnuplot'))
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89 %! title ({'Gnuplot: mesh color is wrong', 'This a Gnuplot bug'});
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90 %! endif
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91