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1 ## Copyright (C) 2000 Paul Kienzle |
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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} {} setdiff (@var{a}, @var{b}) |
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22 ## Return the elements in @var{a} but not in @var{b}, sorted in |
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23 ## ascending order. If @var{a} and @var{b} are both column vectors |
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24 ## return a column vector, otherwise return a row vector. |
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25 ## @end deftypefn |
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26 ## @seealso{unique, union, intersect, setxor, ismember} |
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27 |
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28 ## Author: Paul Kienzle |
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29 ## Adapted-by: jwe |
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30 |
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31 function c = setdiff (a, b) |
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32 |
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33 if (nargin != 2) |
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34 usage ("setdiff (a, b)"); |
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35 endif |
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36 |
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37 c = unique (a); |
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38 if (! isempty (c) && ! isempty (b)) |
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39 ## Form a and b into combined set. |
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40 b = unique (b); |
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41 [dummy, idx] = sort ([c(:); b(:)]); |
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42 ## Eliminate those elements of a that are the same as in b. |
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43 n = length (dummy); |
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44 c(idx(find (dummy(1:n-1) == dummy(2:n)))) = []; |
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45 ## Reshape if necessary. |
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46 if (size (c, 1) != 1 && size (b, 1) == 1) |
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47 c = c.'; |
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48 endif |
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49 endif |
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50 |
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51 endfunction |
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52 |
