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+## Copyright (C) 2007-2012 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} {@var{h} =} stem3 (@var{x}, @var{y}, @var{z}, @var{linespec})
+## Plot a three-dimensional stem graph and return the handles of the line
+## and marker objects used to draw the stems as "stem series" object.
+## The default color is @code{"r"} (red).  The default line style is
+## @code{"-"} and the default marker is @code{"o"}.
+##
+## For example,
+##
+## @example
+## @group
+## theta = 0:0.2:6;
+## stem3 (cos (theta), sin (theta), theta)
+## @end group
+## @end example
+##
+## @noindent
+## plots 31 stems with heights from 0 to 6 lying on a circle.  Color
+## definitions with RGB-triples are not valid!
+## @seealso{bar, barh, stem, plot}
+## @end deftypefn
+
+function h = stem3 (varargin)
+
+  if (nargin < 1 || nargin > 4)
+    print_usage ();
+  endif
+
+  tmp = __stem__ (true, varargin{:});
+
+  if (nargout > 0)
+    h = tmp;
+  endif
+
+endfunction
+
+%!demo
+%! clf
+%! theta = 0:0.2:6;
+%! stem3 (cos (theta), sin (theta), theta)