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diff --git a/octave_packages/m/miscellaneous/setappdata.m b/octave_packages/m/miscellaneous/setappdata.m
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+## 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")
+