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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 3 of the License, or (at |
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8 ## your option) 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, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} values (@var{x}) |
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21 ## Return the different values in a column vector, arranged in ascending |
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22 ## order. |
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23 ## |
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24 ## As an example, @code{values([1, 2, 3, 1])} returns the vector |
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25 ## @code{[1, 2, 3]}. |
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26 ## @end deftypefn |
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27 |
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28 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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29 ## Description: Extract unique elements |
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30 |
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31 function v = values (x) |
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32 |
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33 if (nargin != 1) |
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34 print_usage (); |
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35 endif |
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36 |
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37 if (! (isvector (x))) |
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38 error ("values: x must be a vector"); |
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39 endif |
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40 |
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41 i = any (isnan (x)); |
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42 x = x(find(!isnan (x))); # HACK! |
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43 n = length (x); |
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44 x = reshape (x, n, 1); |
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45 s = sort (x); |
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46 v = s([1; (find (s(2:n) > s(1:n-1)) + 1)]); |
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47 if (i) |
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48 v = [v; NaN]; |
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49 endif |
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50 |
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51 endfunction |
