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doc: Clarify description of plot format. * scripts/plot/plot.m: Clarify description of plot format.
author Rik <rik@octave.org>
date Tue, 06 Aug 2013 21:23:38 -0700
parents df4c4b7708a4
children 87ba70043bfc
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2012 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} {} meshc (@var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} meshc (@var{z})
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22 ## @deftypefnx {Function File} {} meshc (@dots{}, @var{c})
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23 ## @deftypefnx {Function File} {} meshc (@dots{}, @var{prop}, @var{val}, @dots{})
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24 ## @deftypefnx {Function File} {} meshc (@var{hax}, @dots{})
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25 ## @deftypefnx {Function File} {@var{h} =} meshc (@dots{})
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26 ## Plot a 3-D wireframe mesh with underlying contour lines.
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27 ##
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28 ## The wireframe mesh is plotted using rectangles. The vertices of the
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29 ## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
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30 ## over a 2-D rectangular region in the x-y plane. @var{z} determines the
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31 ## height above the plane of each vertex. If only a single @var{z} matrix is
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32 ## given, then it is plotted over the meshgrid
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33 ## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
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34 ## Thus, columns of @var{z} correspond to different @var{x} values and rows
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35 ## of @var{z} correspond to different @var{y} values.
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36 ##
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37 ## The color of the mesh is computed by linearly scaling the @var{Z} values
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38 ## to fit the range of the current colormap. Use @code{caxis} and/or
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39 ## change the colormap to control the appearance.
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40 ##
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41 ## Optionally the color of the mesh can be specified independently of @var{z}
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42 ## by supplying a color matrix, @var{c}.
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43 ##
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44 ## Any property/value pairs are passed directly to the underlying surface
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45 ## object.
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46 ##
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47 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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48 ## rather than the current axes returned by @code{gca}.
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49 ##
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50 ## The optional return value @var{h} is a 2-element vector with a graphics
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51 ## handle to the created surface object and to the created contour plot.
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52 ##
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53 ## @seealso{ezmeshc, mesh, meshz, contour, surfc, surface, meshgrid, hidden, shading, colormap, caxis}
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54 ## @end deftypefn
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55
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56 function h = meshc (varargin)
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57
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58 if (! all (cellfun ("isreal", varargin)))
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59 error ("meshc: X, Y, Z, C arguments must be real");
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60 endif
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61
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62 [hax, varargin, nargin] = __plt_get_axis_arg__ ("meshc", varargin{:});
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63
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64 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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65 unwind_protect
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66 hax = newplot (hax);
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67
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68 htmp = surface (varargin{:});
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69
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70 ## FIXME - gnuplot does not support a filled surface and a
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71 ## non-filled contour. 3D filled patches are also not supported.
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72 ## Thus, the facecolor will be transparent for the gnuplot backend.
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73 set (htmp, "facecolor", "w");
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74 set (htmp, "edgecolor", "flat");
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75 if (! ishold ())
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76 set (hax, "view", [-37.5, 30],
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77 "xgrid", "on", "ygrid", "on", "zgrid", "on",
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78 "xlimmode", "manual", "ylimmode", "manual");
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79 endif
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80
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81 drawnow ();
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82
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83 zmin = get (hax, "zlim")(1);
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84 [~, htmp2] = __contour__ (hax, zmin, varargin{:});
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85
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86 htmp = [htmp; htmp2];
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87
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88 unwind_protect_cleanup
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89 if (! isempty (oldfig))
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90 set (0, "currentfigure", oldfig);
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91 endif
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92 end_unwind_protect
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93
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94 if (nargout > 0)
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95 h = htmp;
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96 endif
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97
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98 endfunction
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99
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100
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101 %!demo
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102 %! clf;
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103 %! colormap ('default');
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104 %! [X, Y] = meshgrid (linspace (-3, 3, 40));
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105 %! Z = sqrt (abs (X .* Y)) ./ (1 + X.^2 + Y.^2);
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106 %! meshc (X, Y, Z);
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107 %! title ('meshc() combines mesh/contour plots');
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108