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1 ## Copyright (C) 1995, 1996, 1997, 1999, 2000, 2002, 2005, 2006, 2007 |
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2 ## Kurt Hornik |
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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 {Mapping Function} {} xor (@var{x}, @var{y}) |
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22 ## Return the `exclusive or' of the entries of @var{x} and @var{y}. |
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23 ## For boolean expressions @var{x} and @var{y}, |
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24 ## @code{xor (@var{x}, @var{y})} is true if and only if @var{x} or @var{y} |
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25 ## is true, but not if both @var{x} and @var{y} are true. |
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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 ## Created: 16 September 1994 |
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30 ## Adapted-By: jwe |
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31 |
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32 function z = xor (x, y) |
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33 |
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34 if (nargin == 2) |
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35 if (isscalar (x) || isscalar (y) || size_equal (x, y)) |
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36 z = logical ((x | y) - (x & y)); |
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37 else |
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38 error ("xor: x and y must be of common size or scalars"); |
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39 endif |
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40 else |
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41 print_usage (); |
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42 endif |
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43 |
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44 endfunction |
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45 |
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46 %!assert((xor ([1, 1, 0, 0], [0, 1, 0, 1]) == [1, 0, 0, 1] |
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47 %! && xor ([i, i, 0, 0], [1, 0, 1, 0]) == [0, 1, 1, 0])); |
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48 |
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49 %!assert(all (all (xor (eye (2), fliplr (eye (2))) == ones (2)))); |
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50 |
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51 %!error xor (); |
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52 |
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53 %!error xor (1, 2, 3); |
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54 |
