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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children bc982528de11
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2005, 2006,
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2 ## 2007 Kurt Hornik
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} values (@var{x})
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22 ## Return the different values in a column vector, arranged in ascending
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23 ## order.
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24 ##
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25 ## As an example, @code{values([1, 2, 3, 1])} returns the vector
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26 ## @code{[1, 2, 3]}.
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27 ## @end deftypefn
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28
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29 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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30 ## Description: Extract unique elements
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31
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32 function v = values (x)
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33
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34 if (nargin != 1)
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35 print_usage ();
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36 endif
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37
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38 if (! (isvector (x)))
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39 error ("values: x must be a vector");
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40 endif
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41
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42 i = any (isnan (x));
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43 x = x(find(!isnan (x))); # HACK!
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44 n = length (x);
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45 x = reshape (x, n, 1);
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46 s = sort (x);
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47 v = s([1; (find (s(2:n) > s(1:n-1)) + 1)]);
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48 if (i)
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49 v = [v; NaN];
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50 endif
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51
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52 endfunction