--- /dev/null
+## Copyright (C) 2010-2012 Ben Abbott
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+##
+## This program 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} {} setappdata (@var{h}, @var{name}, @var{value})
+## Set the named application data to @var{value} for the object(s) with
+## handle(s) @var{h}. If the application data with the specified name does
+## not exist, it is created.
+## @end deftypefn
+
+## Author: Ben Abbott <bpabbott@mac.com>
+## Created: 2010-07-15
+
+function setappdata (h, varargin)
+
+ if (! (all (ishandle (h)) && mod (numel (varargin), 2) == 0))
+ error ("setappdata: invalid input");
+ endif
+
+ for nh = 1:numel(h)
+ if (! isfield (get (h(nh)), "__appdata__"))
+ addproperty ("__appdata__", h(nh), "any", struct ());
+ endif
+ appdata = get (h(nh), "__appdata__");
+ for narg = 1:2:numel(varargin)
+ if (iscellstr (varargin{narg}))
+ ## Handle cell arrays like set() does.
+ set (h(nh), "__appdata__", appdata);
+ setappdata (h(nh), vertcat (varargin{narg}', varargin{narg+1}'){:});
+ appdata = get (h(nh), "__appdata__");
+ elseif (ischar (varargin{narg}))
+ appdata.(varargin{narg}) = varargin{narg+1};
+ else
+ error ("setappdata: invalid input");
+ endif
+ endfor
+ set (h(nh), "__appdata__", appdata);
+ endfor
+
+endfunction
+
+%!test
+%! setappdata (0, "hello", "world")
+%! assert (isappdata (0, "hello"), true)
+%!assert (getappdata (0, "hello"), "world")
+