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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents 22c50cbad2ce
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14138
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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} {} quiver3 (@var{u}, @var{v}, @var{w})
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21 ## @deftypefnx {Function File} {} quiver3 (@var{x}, @var{y}, @var{z}, @var{u}, @var{v}, @var{w})
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22 ## @deftypefnx {Function File} {} quiver3 (@dots{}, @var{s})
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23 ## @deftypefnx {Function File} {} quiver3 (@dots{}, @var{style})
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24 ## @deftypefnx {Function File} {} quiver3 (@dots{}, 'filled')
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25 ## @deftypefnx {Function File} {} quiver3 (@var{h}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} quiver3 (@dots{})
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27 ##
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28 ## Plot the @code{(@var{u}, @var{v}, @var{w})} components of a vector field in
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29 ## an @code{(@var{x}, @var{y}), @var{z}} meshgrid. If the grid is uniform, you
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30 ## can specify @var{x}, @var{y} @var{z} as vectors.
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31 ##
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32 ## If @var{x}, @var{y} and @var{z} are undefined they are assumed to be
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33 ## @code{(1:@var{m}, 1:@var{n}, 1:@var{p})} where @code{[@var{m}, @var{n}] =
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34 ## size(@var{u})} and @code{@var{p} = max (size (@var{w}))}.
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35 ##
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36 ## The variable @var{s} is a scalar defining a scaling factor to use for
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37 ## the arrows of the field relative to the mesh spacing. A value of 0
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38 ## disables all scaling. The default value is 1.
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39 ##
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40 ## The style to use for the plot can be defined with a line style @var{style}
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41 ## in a similar manner to the line styles used with the @code{plot} command.
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42 ## If a marker is specified then markers at the grid points of the vectors are
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43 ## printed rather than arrows. If the argument 'filled' is given then the
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44 ## markers as filled.
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45 ##
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46 ## The optional return value @var{h} is a graphics handle to a quiver object.
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47 ## A quiver object regroups the components of the quiver plot (body, arrow,
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48 ## and marker), and allows them to be changed together.
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49 ##
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50 ## @example
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51 ## @group
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52 ## [x, y, z] = peaks (25);
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53 ## surf (x, y, z);
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54 ## hold on;
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55 ## [u, v, w] = surfnorm (x, y, z / 10);
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56 ## h = quiver3 (x, y, z, u, v, w);
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57 ## set (h, "maxheadsize", 0.33);
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58 ## @end group
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59 ## @end example
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60 ##
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61 ## @seealso{plot}
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62 ## @end deftypefn
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63
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64 function retval = quiver3 (varargin)
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65
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66 [h, varargin, nargin] = __plt_get_axis_arg__ ("quiver3", varargin{:});
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67
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68 if (nargin < 2)
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69 print_usage ();
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70 else
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71 oldh = gca ();
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72 unwind_protect
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73 axes (h);
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74 newplot ();
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75 tmp = __quiver__ (h, 1, varargin{:});
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76 unwind_protect_cleanup
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77 axes (oldh);
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78 end_unwind_protect
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79 endif
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80
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81 if (nargout > 0)
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82 retval = tmp;
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83 endif
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84
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85 endfunction
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86
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87 %!demo
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88 %! clf
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89 %! colormap (jet (64));
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90 %! [x,y] = meshgrid (-1:0.1:1);
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91 %! z = sin (2*pi * sqrt (x.^2+y.^2));
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92 %! theta = 2*pi * sqrt (x.^2+y.^2) + pi/2;
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93 %! quiver3 (x, y, z, sin (theta), cos (theta), ones (size (z)));
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94 %! hold on;
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95 %! mesh (x,y,z);
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96 %! hold off;
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97
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98 %!demo
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99 %! clf
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100 %! [x, y, z] = peaks (25);
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101 %! surf (x, y, z);
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102 %! hold on;
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103 %! [u, v, w] = surfnorm (x, y, z / 10);
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104 %! h = quiver3 (x, y, z, u, v, w);
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105 %! set (h, "maxheadsize", 0.33);
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106 %! hold off;
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107
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108 %!demo
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109 %! clf
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110 %! [x, y, z] = peaks (25);
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111 %! surf (x, y, z);
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112 %! hold on;
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113 %! [u, v, w] = surfnorm (x, y, z / 10);
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114 %! h = quiver3 (x, y, z, u, v, w);
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115 %! set (h, "maxheadsize", 0.33);
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116 %! hold off;
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117 %! shading interp
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118