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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
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