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1 ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2004, 2005, 2006, 2007, 2008 |
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2 ## John W. Eaton |
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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} {} create_set (@var{x}) |
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22 ## @deftypefnx{Function File} {} create_set (@var{x}, "rows") |
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23 ## Return a row vector containing the unique values in @var{x}, sorted in |
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24 ## ascending order. For example, |
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25 ## |
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26 ## @example |
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27 ## @group |
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28 ## create_set ([ 1, 2; 3, 4; 4, 2; 1, 2 ]) |
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29 ## @result{} [ 1, 2, 3, 4 ] |
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30 ## @end group |
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31 ## @end example |
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32 ## |
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33 ## If the optional second input argument is the string "rows" each row of |
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34 ## the matrix @var{x} will be considered an element of set. For example, |
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35 ## @example |
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36 ## @group |
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37 ## create_set ([ 1, 2; 3, 4; 4, 2; 1, 2 ], "rows") |
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38 ## @result{} 1 2 |
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39 ## 3 4 |
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40 ## 4 2 |
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41 ## @end group |
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42 ## @end example |
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43 ## @seealso{union, intersection, complement, unique} |
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44 ## @end deftypefn |
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45 |
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46 ## Author: jwe |
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47 |
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48 function y = create_set (x, rows_opt) |
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49 |
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50 if (nargin < 1 || nargin > 2) |
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51 print_usage (); |
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52 endif |
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53 |
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54 if (nargin == 1) |
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55 y = unique (x).'; |
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56 elseif (strcmpi (rows_opt, "rows")) |
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57 y = unique (x, "rows"); |
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58 else |
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59 error ("create_set: expecting \"rows\" as second argument"); |
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60 endif |
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61 |
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62 endfunction |
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63 |
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64 %!assert(all (all (create_set ([1, 2; 3, 4; 2, 4]) == [1, 2, 3, 4]))); |
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65 |
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66 %!assert(all (all (create_set ([1; 2; 3; 4; 2; 4]) == [1, 2, 3, 4]))); |
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67 |
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68 %!assert(isempty (create_set ([]))); |
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69 |
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70 %!error create_set (1, 2); |
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71 |
