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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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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, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} create_set (@var{x}) |
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22 ## Return a row vector containing the unique values in @var{x}, sorted in |
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23 ## ascending order. For example, |
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24 ## |
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25 ## @example |
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26 ## @group |
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27 ## create_set ([ 1, 2; 3, 4; 4, 2 ]) |
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28 ## @result{} [ 1, 2, 3, 4 ] |
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29 ## @end group |
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30 ## @end example |
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31 ## @end deftypefn |
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32 ## |
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33 ## @seealso{union, intersection, and complement} |
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34 |
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35 ## Author: jwe |
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36 |
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37 function y = create_set(x) |
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38 |
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39 if (nargin != 1) |
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40 usage ("create_set(x)"); |
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41 endif |
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42 |
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43 if (isempty(x)) |
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44 y = []; |
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45 else |
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46 nel = numel (x); |
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47 y = sort (reshape (x, 1, nel)); |
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48 els = find (y(1:nel-1) != y(2:nel)); |
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49 if (isempty (els)); |
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50 y = y(1); |
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51 else |
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52 y = y([1, els+1]); |
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53 endif |
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54 endif |
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55 |
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56 endfunction |
