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+## Copyright (C) 2007 David Bateman
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} quiver3 (@var{u}, @var{v}, @var{w})
+## @deftypefnx {Function File} {} quiver3 (@var{x}, @var{y}, @var{z}, @var{u}, @var{v}, @var{w})
+## @deftypefnx {Function File} {} quiver3 (@dots{}, @var{s})
+## @deftypefnx {Function File} {} quiver3 (@dots{}, @var{style})
+## @deftypefnx {Function File} {} quiver3 (@dots{}, 'filled')
+## @deftypefnx {Function File} {} quiver3 (@var{h}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} quiver3 (@dots{})
+##
+## Plot the @code{(@var{u}, @var{v}, @var{w})} components of a vector field in 
+## an @code{(@var{x}, @var{y}), @var{z}} meshgrid. If the grid is uniform, you 
+## can specify @var{x}, @var{y} @var{z} as vectors.
+##
+## If @var{x}, @var{y} and @var{z} are undefined they are assumed to be
+## @code{(1:@var{m}, 1:@var{n}, 1:@var{p})} where @code{[@var{m}, @var{n}] = 
+## size(@var{u})} and @code{@var{p} = max (size (@var{w}))}.
+##
+## The variable @var{s} is a scalar defining a scaling factor to use for
+##  the arrows of the field relative to the mesh spacing. A value of 0 
+## disables all scaling. The default value is 1.
+##
+## The style to use for the plot can be defined with a line style @var{style}
+## in a similar manner to the line styles used with the @code{plot} command.
+## If a marker is specified then markers at the grid points of the vectors are
+## printed rather than arrows. If the argument 'filled' is given then the
+## markers as filled.
+##
+## The optional return value @var{h} provides a list of handles to the 
+## the parts of the vector field (body, arrow and marker).
+##
+## @example
+## @group
+## [x, y, z] = peaks (25);
+## surf (x, y, z);
+## hold on;
+## [u, v, w] = surfnorm (x, y, z / 10);
+## quiver3 (x, y, z, u, v, w);
+## @end group
+## @end example
+##
+## @seealso{plot}
+## @end deftypefn
+
+function retval = quiver3 (varargin)
+
+  if (nargin < 2)
+    print_usage ();
+  elseif (isscalar (varargin{1}) && ishandle (varargin{1}))
+    h = varargin {1};
+    if (! strcmp (get (h, "type"), "axes"))
+      error ("quiver: expecting first argument to be an axes object");
+    endif
+    oldh = gca ();
+    unwind_protect
+      axes (h);
+      newplot ();
+      tmp = __quiver__ (h, 1, varargin{2:end});
+    unwind_protect_cleanup
+      axes (oldh);
+    end_unwind_protect
+  else
+    newplot ();
+    tmp = __quiver__ (gca (), 1, varargin{:});
+  endif
+
+  if (nargout > 0)
+    retval = tmp;
+  endif
+
+endfunction
+
+%!demo
+%! [x,y]=meshgrid (-1:0.1:1); 
+%! z=sin(2*pi*sqrt(x.^2+y.^2)); 
+%! theta=2*pi*sqrt(x.^2+y.^2)+pi/2;
+%! quiver3(x,y,z,sin(theta),cos(theta),ones(size(z)));
+%! hold on; 
+%! mesh(x,y,z); 
+%! hold off;