--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/deprecated/complement.m	Thu Jun 09 13:35:10 2011 -0400
@@ -0,0 +1,78 @@
+## Copyright (C) 1994-2011 John W. Eaton
+##
+## 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} {} complement (@var{x}, @var{y})
+## Return the elements of set @var{y} that are not in set @var{x}.  For
+## example:
+##
+## @example
+## @group
+## complement ([ 1, 2, 3 ], [ 2, 3, 5 ])
+##      @result{} 5
+## @end group
+## @end example
+## @seealso{union, intersect, unique}
+## @end deftypefn
+
+## Author: jwe
+
+## Deprecated in version 3.2
+
+function y = complement (a, b)
+
+  persistent warned = false;
+  if (! warned)
+    warned = true;
+    warning ("Octave:deprecated-function",
+             "complement is obsolete and will be removed from a future version of Octave, please use setdiff instead");
+  endif
+
+  if (nargin != 2)
+    print_usage ();
+  endif
+
+  if (isempty (a))
+    y = unique (b);
+  elseif (isempty (b))
+    y = [];
+  else
+    a = unique (a);
+    b = unique (b);
+    yindex = 1;
+    y = zeros (1, length (b));
+    for index = 1:length (b)
+      if (all (a != b (index)))
+        y(yindex++) = b(index);
+      endif
+    endfor
+    y = y(1:(yindex-1));
+  endif
+
+endfunction
+
+%!assert(all (all (complement ([1, 2, 3], [3; 4; 5; 6]) == [4, 5, 6])));
+
+%!assert(all (all (complement ([1, 2, 3], [3, 4, 5, 6]) == [4, 5, 6])));
+
+%!assert(isempty (complement ([1, 2, 3], [3, 2, 1])));
+
+%!error complement (1);
+
+%!error complement (1, 2, 3);
+