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doc: Rewrite docstrings for most plot functions. Emphasize clarity, use common "voice", and increase density of seealso links. * doc/interpreter/plot.txi: Add @findex entries that were in xlim.m * scripts/miscellaneous/getappdata.m scripts/miscellaneous/setappdata.m, scripts/plot/allchild.m, scripts/plot/ancestor.m, scripts/plot/area.m, scripts/plot/axes.m, scripts/plot/axis.m, scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/box.m, scripts/plot/caxis.m, scripts/plot/cla.m, scripts/plot/clabel.m, scripts/plot/clf.m, scripts/plot/close.m, scripts/plot/closereq.m, scripts/plot/colorbar.m, scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/compass.m, scripts/plot/contour.m, scripts/plot/contour3.m, scripts/plot/contourc.m, scripts/plot/contourf.m, scripts/plot/copyobj.m, scripts/plot/cylinder.m, scripts/plot/daspect.m, scripts/plot/diffuse.m, scripts/plot/ellipsoid.m, scripts/plot/errorbar.m, scripts/plot/ezcontour.m, scripts/plot/ezcontourf.m, scripts/plot/ezmesh.m, scripts/plot/ezmeshc.m, scripts/plot/ezplot.m, scripts/plot/ezplot3.m, scripts/plot/ezpolar.m, scripts/plot/ezsurf.m, scripts/plot/ezsurfc.m, scripts/plot/feather.m, scripts/plot/figure.m, scripts/plot/fill.m, scripts/plot/findall.m, scripts/plot/findobj.m, scripts/plot/fplot.m, scripts/plot/gca.m, scripts/plot/gcbf.m, scripts/plot/gcbo.m, scripts/plot/gcf.m, scripts/plot/gco.m, scripts/plot/ginput.m, scripts/plot/graphics_toolkit.m, scripts/plot/grid.m, scripts/plot/gtext.m, scripts/plot/guidata.m, scripts/plot/guihandles.m, scripts/plot/hdl2struct.m, scripts/plot/hggroup.m, scripts/plot/hidden.m, scripts/plot/hist.m, scripts/plot/hold.m, scripts/plot/ishghandle.m, scripts/plot/ishold.m, scripts/plot/isocolors.m, scripts/plot/isprop.m, scripts/plot/legend.m, scripts/plot/line.m, scripts/plot/linkprop.m, scripts/plot/loglog.m, scripts/plot/loglogerr.m, scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshgrid.m, scripts/plot/meshz.m, scripts/plot/newplot.m, scripts/plot/orient.m, scripts/plot/pareto.m, scripts/plot/patch.m, scripts/plot/pcolor.m, scripts/plot/peaks.m, scripts/plot/pie.m, scripts/plot/pie3.m, scripts/plot/plot.m, scripts/plot/plot3.m, scripts/plot/plotmatrix.m, scripts/plot/plotyy.m, scripts/plot/polar.m, scripts/plot/print.m, scripts/plot/quiver.m, scripts/plot/quiver3.m, scripts/plot/rectangle.m, scripts/plot/refresh.m, scripts/plot/refreshdata.m, scripts/plot/ribbon.m, scripts/plot/rose.m, scripts/plot/saveas.m, scripts/plot/scatter.m, scripts/plot/scatter3.m, scripts/plot/semilogx.m, scripts/plot/semilogxerr.m, scripts/plot/semilogy.m, scripts/plot/semilogyerr.m, scripts/plot/shading.m, scripts/plot/shg.m, scripts/plot/shrinkfaces.m, scripts/plot/slice.m, scripts/plot/specular.m, scripts/plot/sphere.m, scripts/plot/stairs.m, scripts/plot/stem.m, scripts/plot/stem3.m, scripts/plot/struct2hdl.m, scripts/plot/subplot.m, scripts/plot/surf.m, scripts/plot/surface.m, scripts/plot/surfc.m, scripts/plot/surfl.m, scripts/plot/tetramesh.m, scripts/plot/text.m, scripts/plot/title.m, scripts/plot/trimesh.m, scripts/plot/triplot.m, scripts/plot/trisurf.m, scripts/plot/view.m, scripts/plot/waitbar.m, scripts/plot/waitforbuttonpress.m, scripts/plot/waterfall.m, scripts/plot/whitebg.m, scripts/plot/xlabel.m, scripts/plot/xlim.m, scripts/plot/ylabel.m, scripts/plot/ylim.m, scripts/plot/zlabel.m, scripts/plot/zlim.m: Rewrite docstrings for most plot functions. Emphasize clarity, use common "voice", and increase density of seealso links.
author Rik <rik@octave.org>
date Wed, 31 Jul 2013 13:53:30 -0700
parents 9ff7d4849f03
children 26589abbc78d
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 1993-2012 Shai Ayal
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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} {} contour (@var{z})
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21 ## @deftypefnx {Function File} {} contour (@var{z}, @var{vn})
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22 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z})
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23 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z}, @var{vn})
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24 ## @deftypefnx {Function File} {} contour (@dots{}, @var{style})
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25 ## @deftypefnx {Function File} {} contour (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour (@dots{})
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27 ## Create a 2-D contour plot.
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28 ##
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29 ## Plot level curves (contour lines) of the matrix @var{z}, using the
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30 ## contour matrix @var{c} computed by @code{contourc} from the same
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31 ## arguments; see the latter for their interpretation.
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32 ##
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33 ## The appearance of contour lines can be defined with a line style @var{style}
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34 ## in the same manner as @code{plot}. Only line style and color are used;
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35 ## Any markers defined by @var{style} are ignored.
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36 ##
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37 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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38 ## rather than the current axes returned by @code{gca}.
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39 ##
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40 ## The optional output @var{c} are the contour levels in @code{contourc} format.
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41 ##
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42 ## The optional return value @var{h} is a graphics handle to the hggroup
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43 ## comprising the contour lines.
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44 ##
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45 ## Example:
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46 ##
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47 ## @example
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48 ## @group
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49 ## x = 0:2;
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50 ## y = x;
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51 ## z = x' * y;
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52 ## contour (x, y, z, 2:3)
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53 ## @end group
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54 ## @end example
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55 ##
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56 ## @seealso{ezcontour, contourc, contourf, contour3, clabel, meshc, surfc, caxis, colormap, plot}
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57 ##
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58 ## @end deftypefn
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60 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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61
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62 function [c, h] = contour (varargin)
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63
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64 [hax, varargin] = __plt_get_axis_arg__ ("contour", varargin{:});
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66 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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67 unwind_protect
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68 hax = newplot (hax);
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70 [ctmp, htmp] = __contour__ (hax, "none", varargin{:});
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71
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72 unwind_protect_cleanup
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73 if (! isempty (oldfig))
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74 set (0, "currentfigure", oldfig);
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75 endif
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76 end_unwind_protect
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77
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78 if (nargout > 0)
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79 c = ctmp;
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80 h = htmp;
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81 endif
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82
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83 endfunction
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84
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85
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86 %!demo
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87 %! clf;
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88 %! colormap ('default');
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89 %! [x, y, z] = peaks ();
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90 %! contour (x, y, z);
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91
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92 %!demo
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93 %! clf;
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94 %! colormap ('default');
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95 %! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64));
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96 %! [X, Y] = pol2cart (theta, r);
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97 %! Z = sin (2*theta) .* (1-r);
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98 %! contour (X, Y, abs (Z), 10);
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99
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100 %!demo
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101 %! clf;
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102 %! colormap ('default');
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103 %! x = linspace (-2, 2);
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104 %! [x, y] = meshgrid (x);
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105 %! z = sqrt (x.^2 + y.^2) ./ (x.^2 + y.^2 + 1);
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106 %! contourf (x, y, z, [0.4, 0.4]);
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107 %! title ('The hole should be filled with the background color');
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108
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109 %!test
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110 %! hf = figure ("visible", "off");
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111 %! clf (hf);
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112 %! unwind_protect
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113 %! [x, y, z] = peaks ();
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114 %! [c, h] = contour (x, y, z);
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115 %! levellist = (-6):6;
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116 %! set (h, "levellist", levellist);
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117 %! assert (get (h, "levellist"), levellist)
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118 %! assert (get (h, "levellistmode"), "manual")
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119 %! unwind_protect_cleanup
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120 %! close (hf);
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121 %! end_unwind_protect
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122
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123 %!test
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124 %! hf = figure ("visible", "off");
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125 %! clf (hf);
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126 %! unwind_protect
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127 %! [x, y, z] = peaks ();
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128 %! [c, h] = contour (x, y, z);
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129 %! levelstep = 3;
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130 %! set (h, "levelstep", levelstep);
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131 %! assert (get (h, "levelstep"), levelstep)
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132 %! assert (get (h, "levelstepmode"), "manual")
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133 %! assert (get (h, "levellist"), (-6):levelstep:6)
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134 %! assert (get (h, "levellistmode"), "auto")
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135 %! unwind_protect_cleanup
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136 %! close (hf);
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Ben Abbott <bpabbott@mac.com>
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137 %! end_unwind_protect
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138