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annotate scripts/miscellaneous/xor.m @ 16207:0467d68ca891

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move current_input_line to lexical_feedback class * input.h, input.cc, lex.h, lex.ll (current_input_line): Declare as member of lexical_feedback class. (octave_base_reader::octave_gets, octave_terminal_reader::get_input, octave_file_reader::get_input, octave_eval_string_reader::get_input): Don't set current_input_line. (octave_lexer::read): Set current_input_line. * oct-parse.in.yy (octave_parser::bison_error): Use curr_lexer->current_input_line.
author John W. Eaton <jwe@octave.org>
date Wed, 06 Mar 2013 19:39:48 -0500
parents f3d52523cde1
children 7268845c0a1e
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 1995-2012 Kurt Hornik
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Mapping Function} {@var{z} =} xor (@var{x}, @var{y})
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21 ## Return the `exclusive or' of the entries of @var{x} and @var{y}.
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22 ## For boolean expressions @var{x} and @var{y},
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23 ## @code{xor (@var{x}, @var{y})} is true if and only if one of @var{x} or
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24 ## @var{y} is true. Otherwise, for @var{x} and @var{y} both true or both
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25 ## false, @code{xor} returns false.
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26 ##
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27 ## The truth table for the xor operation is
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28 ##
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29 ## @multitable @columnfractions 0.44 .03 .05 .03 0.44
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30 ## @item @tab @var{x} @tab @var{y} @tab @var{z} @tab
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31 ## @item @tab 0 @tab 0 @tab 0 @tab
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32 ## @item @tab 1 @tab 0 @tab 1 @tab
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33 ## @item @tab 0 @tab 1 @tab 1 @tab
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34 ## @item @tab 1 @tab 1 @tab 0 @tab
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35 ## @end multitable
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36 ##
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37 ## @seealso{and, or, not}
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38 ## @end deftypefn
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40 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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41 ## Created: 16 September 1994
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42 ## Adapted-By: jwe
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43
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44 function z = xor (x, y)
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45
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46 if (nargin == 2)
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47 if (isscalar (x) || isscalar (y) || size_equal (x, y))
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48 ## Typecast to logicals is necessary for other numeric types.
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49 z = logical (x) != logical (y);
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50 else
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51 try
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52 z = bsxfun (@xor, x, y);
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53 catch
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54 error ("xor: X and Y must be of compatible size or scalars");
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55 end_try_catch
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56 endif
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57 else
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58 print_usage ();
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59 endif
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60
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61 endfunction
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63
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64 %!assert (xor ([1, 1, 0, 0], [0, 1, 0, 1]), logical ([1, 0, 0, 1]))
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65 %!assert (xor ([i, i, 0, 0], [1, 0, 1, 0]), logical ([0, 1, 1, 0]))
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67 %!assert (xor (eye (2), fliplr (eye (2))), logical (ones (2)))
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69 %!error xor ()
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70 %!error xor (1, 2, 3)
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