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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 3e1b24a2454a
children 26589abbc78d
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2007-2012 Michael Goffioul and Kai Habel
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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 {Command} {} cylinder
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21 ## @deftypefnx {Function File} {} cylinder (@var{r})
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22 ## @deftypefnx {Function File} {} cylinder (@var{r}, @var{n})
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23 ## @deftypefnx {Function File} {} cylinder (@var{hax}, @dots{})
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24 ## @deftypefnx {Function File} {[@var{x}, @var{y}, @var{z}] =} cylinder (@dots{})
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25 ## Plot a 3-D unit cylinder.
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26 ##
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27 ## The optional input @var{r} is a vector specifying the radius along the
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28 ## unit z-axis. The default is [1 1] indicating radius 1 at @code{Z == 0}
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29 ## and at @code{Z == 1}.
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30 ##
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31 ## The optional input @var{n} determines the number of faces around the
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32 ## the circumference of the cylinder. The default value is 20.
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33 ##
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34 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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35 ## rather than the current axes returned by @code{gca}.
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36 ##
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37 ## If outputs are requested @code{cylinder} returns three matrices in
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38 ## @code{meshgrid} format, such that @code{surf (@var{x}, @var{y}, @var{z})}
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39 ## generates a unit cylinder.
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40 ##
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41 ## Example:
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42 ##
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43 ## @example
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44 ## @group
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45 ## [x, y, z] = cylinder (10:-1:0, 50);
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46 ## surf (x, y, z);
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47 ## title ("a cone");
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48 ## @end group
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49 ## @end example
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50 ## @seealso{ellipsoid, rectangle, sphere}
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51 ## @end deftypefn
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52
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53 function [xx, yy, zz] = cylinder (varargin)
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54
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55 [hax, args, nargs] = __plt_get_axis_arg__ ("cylinder", varargin{:});
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56
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57 if (nargs == 0)
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58 n = 20;
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59 r = [1, 1];
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60 elseif (nargs == 1)
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61 n = 20;
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62 r = args{1};
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63 elseif (nargs == 2)
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64 r = args{1};
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65 n = args{2};
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66 else
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67 print_usage ();
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68 endif
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69
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70 if (length (r) < 2)
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71 error ("cylinder: length (R) must be larger than 2");
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72 endif
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73
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74 phi = linspace (0, 2*pi, n+1);
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75 idx = 1:length (r);
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76 [phi, idx] = meshgrid (phi, idx);
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77 z = (idx - 1) / (length (r) - 1);
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78 r = r(idx);
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79 [x, y] = pol2cart (phi, r);
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80
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81 if (nargout > 0)
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82 xx = x;
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83 yy = y;
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84 zz = z;
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85 else
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86 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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87 unwind_protect
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88 hax = newplot (hax);
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89
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90 surf (hax, x, y, z);
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91
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92 unwind_protect_cleanup
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93 if (! isempty (oldfig))
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94 set (0, "currentfigure", oldfig);
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95 endif
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96 end_unwind_protect
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97 endif
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98
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99 endfunction
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100
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101
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102 %!demo
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103 %! clf;
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104 %! colormap ('default');
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105 %! [x, y, z] = cylinder (10:-1:0,50);
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106 %! surf (x, y, z);
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107 %! title ('a cone');
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108