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+## Copyright (C) 1995, 1996, 1997  Kurt Hornik
+## 
+## 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, 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 file.  If not, write to the Free Software Foundation,
+## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+## usage:  values (x)
+##
+## Return the different values in a column vector, arranged in ascending
+## order.
+  
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  Extract unique elements
+
+function v = values (x)
+  
+  if (nargin != 1)
+    usage ("values (x)");
+  endif
+  
+  if !(is_vector (x))
+    error ("values:  x must be a vector");
+  endif
+
+  i = any (isnan (x));
+  x = x(find(!isnan (x)));	# HACK!
+  n = length (x);
+  x = reshape (x, n, 1);
+  s = sort (x);
+  v = s([1; find (s(2:n) > s(1:n-1)) + 1]);
+  if (i)
+    v = [v; NaN];
+  endif
+
+endfunction