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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 f17d9a574645
children 26589abbc78d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 David Bateman
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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} {} compass (@var{u}, @var{v})
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21 ## @deftypefnx {Function File} {} compass (@var{z})
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22 ## @deftypefnx {Function File} {} compass (@dots{}, @var{style})
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23 ## @deftypefnx {Function File} {} compass (@var{hax}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} compass (@dots{})
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25 ##
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26 ## Plot the @code{(@var{u}, @var{v})} components of a vector field emanating
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27 ## from the origin of a polar plot.
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28 ##
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29 ## The arrow representing each vector has one end at the origin and the tip at
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30 ## [@var{u}(i), @var{v}(i)]. If a single complex argument @var{z} is given,
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31 ## then @code{@var{u} = real (@var{z})} and @code{@var{v} = imag (@var{z})}.
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32 ##
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33 ## The style to use for the plot can be defined with a line style @var{style}
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34 ## of the same format as the @code{plot} command.
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35 ##
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36 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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37 ## rather than the current axes returned by @code{gca}.
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38 ##
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39 ## The optional return value @var{h} is a vector of graphics handles to the
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40 ## line objects representing the drawn vectors.
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41 ##
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42 ## @example
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43 ## @group
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44 ## a = toeplitz ([1;randn(9,1)], [1,randn(1,9)]);
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45 ## compass (eig (a));
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46 ## @end group
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47 ## @end example
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48 ##
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49 ## @seealso{polar, quiver, feather, plot}
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50 ## @end deftypefn
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51
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52 function h = compass (varargin)
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53
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54 [hax, varargin, nargin] = __plt_get_axis_arg__ ("compass", varargin{:});
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55
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56 if (nargin == 0)
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57 print_usage ();
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58 elseif (nargin == 1 || (nargin == 2 && ! isnumeric (varargin{2})))
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59 ioff = 2;
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60 z = varargin{1}(:).';
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61 u = real (z);
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62 v = imag (z);
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63 elseif (nargin > 1 && isnumeric (varargin{2}))
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64 ioff = 3;
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65 u = varargin{1}(:).';
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66 v = varargin{2}(:).';
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67 endif
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68
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69 arrowsize = 0.25;
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70 line_spec = "b-";
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71 have_line_spec = false;
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72 while (ioff <= nargin)
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73 arg = varargin{ioff++};
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74 if ((ischar (arg) || iscell (arg)) && ! have_line_spec)
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75 [linespec, valid] = __pltopt__ ("compass", arg, false);
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76 if (valid)
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77 line_spec = arg;
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78 have_line_spec = true;
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79 break;
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80 else
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81 error ("compass: invalid linespec");
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82 endif
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83 else
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84 error ("compass: unrecognized argument");
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85 endif
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86 endwhile
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87
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88 ## Matlab draws compass plots, with the arrow head as one continous
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89 ## line, and each arrow separately. This is completely different than
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90 ## quiver and quite ugly.
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91 n = length (u);
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92 xend = u;
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93 xtmp = u .* (1 - arrowsize);
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94 yend = v;
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95 ytmp = v .* (1 - arrowsize);
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96 x = [zeros(1, n); xend; xtmp - v * arrowsize / 3; xend; ...
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97 xtmp + v * arrowsize / 3];
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98 y = [zeros(1, n); yend; ytmp + u * arrowsize / 3; yend; ...
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99 ytmp - u * arrowsize / 3];
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100 [r, p] = cart2pol (x, y);
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101
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102 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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103 unwind_protect
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104 hax = newplot (hax);
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105 hlist = polar (hax, r, p, line_spec);
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106 unwind_protect_cleanup
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107 if (! isempty (oldfig))
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108 set (0, "currentfigure", oldfig);
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109 endif
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110 end_unwind_protect
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111
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112 if (nargout > 0)
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113 h = hlist;
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114 endif
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115
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116 endfunction
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117
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118
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119 %!demo
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120 %! clf;
11363
a0dfd7e8e3e2 Assign data used in demo plots for reproducibility between runs
Rik <octave@nomad.inbox5.com>
parents: 10793
diff changeset
121 %! randn_9x1_data = [-2.555884; 0.394974; -0.191871; -1.147024; 1.355425; -0.437335; -0.014370; -0.941312; 1.240300];
a0dfd7e8e3e2 Assign data used in demo plots for reproducibility between runs
Rik <octave@nomad.inbox5.com>
parents: 10793
diff changeset
122 %! randn_1x9_data = [1.42934, -1.10821, -1.70404, 0.63357, -0.68337, -1.19771, -0.96502, -1.12810, 0.22457];
a0dfd7e8e3e2 Assign data used in demo plots for reproducibility between runs
Rik <octave@nomad.inbox5.com>
parents: 10793
diff changeset
123 %! a = toeplitz ([1;randn_9x1_data], [1,randn_1x9_data]);
a0dfd7e8e3e2 Assign data used in demo plots for reproducibility between runs
Rik <octave@nomad.inbox5.com>
parents: 10793
diff changeset
124 %! compass (eig (a));
a0dfd7e8e3e2 Assign data used in demo plots for reproducibility between runs
Rik <octave@nomad.inbox5.com>
parents: 10793
diff changeset
125