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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 ## @seealso{union, intersection, and complement} |
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33 |
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34 ## Author: jwe |
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35 |
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36 function y = create_set(x) |
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37 |
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38 if ( nargin != 1) |
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39 usage ("create_set(x)"); |
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40 endif |
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41 |
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42 if(isempty(x)) |
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43 y = []; |
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44 else |
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45 [nrx, ncx] = size(x); |
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46 nelx = nrx*ncx; |
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47 x = reshape(x,1,nelx); |
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48 y = zeros(1,nelx); |
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49 |
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50 x = sort(x); |
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51 cur_val = y(1) = x(1); |
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52 yindex = xindex = 2; |
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53 |
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54 while (xindex <= nelx) |
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55 if(cur_val != x(xindex)) |
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56 cur_val = x(xindex); |
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57 y(yindex++) = cur_val; |
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58 endif |
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59 xindex++; |
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60 endwhile |
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61 y = y(1:(yindex-1)); |
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62 endif |
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63 |
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64 endfunction |
