```--- a
+++ b/isequal.m
@@ -0,0 +1,45 @@
+## Copyright (C) 2000 Paul Kienzle
+##
+## This program is free software; you can redistribute it and/or modify
+## 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 this program; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+## isequal(x1, x2, ...)
+##    true if all parts of x1, x2, ... are equal
+
+##TODO: list comparison
+function t = isequal(x,y,...)
+  if is_struct(x)
+    if (!is_struct (y))
+      t = 0;
+    else
+      xel = struct_elements (x);
+      yel = struct_elements (y);
+      if (any (any (xel != yel)))
+	t = 0;
+      else
+	for i=1:length (xel)
+      	  t = eval (["isequal(x.", xel(i), ", y.", yel(i), ");"]);
+	  if t == 0, break; endif
+	endfor
+      endif
+    endif
+  elseif any (size (x) != size (y))
+    t = 0;
+  else
+    t = all(all(x==y));
+  endif
+  if nargin > 2 && t == 1
+     t = isequal(x, all_va_args);
+  endif
+endfunction
```