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diff --git a/octave_packages/m/plot/isprop.m b/octave_packages/m/plot/isprop.m
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+++ b/octave_packages/m/plot/isprop.m
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+## Copyright (C) 2010-2012 Ben Abbott
+##
+## 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{res} =} isprop (@var{h}, @var{prop})
+## Return true if @var{prop} is a property of the object with handle @var{h}.
+## @seealso{get, set}
+## @end deftypefn
+
+## Author: Ben Abbott  <bpabbott@mac.com>
+
+function res = isprop (h, prop)
+  ## Check input
+  if (nargin < 1 || nargin > 2)
+    print_usage ();
+  endif
+
+  if (! all (ishandle (h)))
+    error ("isprop: first input argument must be a handle");
+  elseif (! ischar (prop))
+    error ("isprop: second input argument must be string");
+  endif
+
+  res = false (size (h));
+  for n = 1:numel(res)
+    res(n) = true;
+    try
+      v = get (h(n), prop);
+    catch
+      res(n) = false;
+    end_try_catch
+  endfor
+endfunction
+
+%!assert (isprop (0, "foobar"), false)
+
+%!assert (isprop (0, "screenpixelsperinch"), true)
+
+%!assert (isprop (zeros (2, 3), "visible"), true (2, 3))
+