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Don't use ifelse in plot fcns to avoid unnecessary fcn evaluations. * scripts/plot/area.m, scripts/plot/axis.m, scripts/plot/caxis.m, scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/compass.m, scripts/plot/contour.m, scripts/plot/contour3.m, scripts/plot/contourf.m, scripts/plot/cylinder.m, scripts/plot/ellipsoid.m, scripts/plot/errorbar.m, scripts/plot/feather.m, scripts/plot/fill.m, scripts/plot/loglog.m, scripts/plot/loglogerr.m, scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshz.m, scripts/plot/pcolor.m, scripts/plot/pie.m, scripts/plot/pie3.m, scripts/plot/plot.m, scripts/plot/plot3.m, scripts/plot/polar.m, scripts/plot/private/__bar__.m, scripts/plot/private/__ezplot__.m, scripts/plot/private/__stem__.m, scripts/plot/quiver.m, scripts/plot/quiver3.m, scripts/plot/rectangle.m, scripts/plot/ribbon.m, scripts/plot/rose.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/slice.m, scripts/plot/sphere.m, scripts/plot/stairs.m, scripts/plot/surf.m, scripts/plot/surfc.m, scripts/plot/surfl.m, scripts/plot/surfnorm.m, scripts/time/datetick.m: Don't use ifelse in plot fcns to avoid unnecessary fcn evaluations.
author Rik <rik@octave.org>
date Fri, 09 Aug 2013 19:26:55 -0700
parents 52931d71400f
children bc924baa2c4e
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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} {} quiver (@var{u}, @var{v})
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21 ## @deftypefnx {Function File} {} quiver (@var{x}, @var{y}, @var{u}, @var{v})
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22 ## @deftypefnx {Function File} {} quiver (@dots{}, @var{s})
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23 ## @deftypefnx {Function File} {} quiver (@dots{}, @var{style})
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24 ## @deftypefnx {Function File} {} quiver (@dots{}, "filled")
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25 ## @deftypefnx {Function File} {} quiver (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} quiver (@dots{})
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27 ##
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28 ## Plot the (@var{u}, @var{v}) components of a vector field in
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29 ## an (@var{x}, @var{y}) meshgrid. If the grid is uniform, you can
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30 ## specify @var{x} and @var{y} as vectors.
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31 ##
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32 ## If @var{x} and @var{y} are undefined they are assumed to be
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33 ## @code{(1:@var{m}, 1:@var{n})} where
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34 ## @code{[@var{m}, @var{n}] = size (@var{u})}.
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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 ## of the same format as 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 ## drawn rather than arrows. If the argument "filled" is given then the
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44 ## markers are filled.
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45 ##
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46 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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47 ## rather than the current axes returned by @code{gca}.
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48 ##
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49 ## The optional return value @var{h} is a graphics handle to a quiver object.
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50 ## A quiver object regroups the components of the quiver plot (body, arrow,
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51 ## and marker), and allows them to be changed together.
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52 ##
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53 ## @example
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54 ## @group
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55 ## [x, y] = meshgrid (1:2:20);
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56 ## h = quiver (x, y, sin (2*pi*x/10), sin (2*pi*y/10));
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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{quiver3, compass, feather, plot}
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62 ## @end deftypefn
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63
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64 function retval = quiver (varargin)
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65
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66 [hax, varargin, nargin] = __plt_get_axis_arg__ ("quiver", 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 oldfig = [];
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72 if (isempty (hax))
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73 oldfig = get (0, "currentfigure");
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74 endif
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75 unwind_protect
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76 hax = newplot (hax);
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77 htmp = __quiver__ (hax, false, varargin{:});
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78 unwind_protect_cleanup
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79 if (! isempty (oldfig))
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80 set (0, "currentfigure", oldfig);
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81 endif
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82 end_unwind_protect
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83 endif
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84
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85 if (nargout > 0)
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86 retval = htmp;
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87 endif
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88
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89 endfunction
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90
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91
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92 %!demo
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93 %! clf;
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94 %! [x,y] = meshgrid (1:2:20);
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95 %! h = quiver (x,y, sin (2*pi*x/10), sin (2*pi*y/10));
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96 %! set (h, 'maxheadsize', 0.33);
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97
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98 %!demo
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99 %! clf;
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100 %! axis ('equal');
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101 %! x = linspace (0, 3, 80);
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102 %! y = sin (2*pi*x);
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103 %! theta = 2*pi*x + pi/2;
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104 %! quiver (x, y, sin (theta)/10, cos (theta)/10);
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105 %! hold on; plot (x,y,'r'); hold off;
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106