--- a/scripts/ChangeLog	Mon Dec 28 10:11:20 2009 -0600
+++ b/scripts/ChangeLog	Tue Dec 29 21:42:41 2009 +0100
@@ -1,3 +1,7 @@
+2009-12-29  Jaroslav Hajek  <highegg@gmail.com>
+
+	* set/complement.m: Deprecate.
+
 2009-12-28  Jaroslav Hajek  <highegg@gmail.com>
 
 	* strings/strcat.m: Further simplify.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/deprecated/complement.m	Tue Dec 29 21:42:41 2009 +0100
@@ -0,0 +1,79 @@
+## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2004, 2005, 2006, 2007,
+##               2008, 2009 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+             "complement is obsolete and will be removed from a future version of Octave, please use setdiff instead");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);
+

--- a/scripts/set/complement.m	Mon Dec 28 10:11:20 2009 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,70 +0,0 @@
-## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2004, 2005, 2006, 2007,
-##               2008, 2009 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
-
-function y = complement (a, b)
-
-  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);
-