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annotate scripts/statistics/base/values.m @ 6754:451b346d8c2f

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[project @ 2007-06-25 17:31:46 by jwe]
author jwe
date Mon, 25 Jun 2007 17:31:47 +0000
parents 34f96dd5441b
children 93c65f2a5668
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 2, or (at your option)
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8 ## any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, write to the Free
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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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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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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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