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update copyright notices
author John W. Eaton <jwe@octave.org>
date Sat, 07 Mar 2009 10:41:27 -0500
parents 935be827eaf8
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1 ## Copyright (C) 1996, 1997, 1998, 2000, 2005, 2006, 2007, 2008 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 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 {Function File} {} logical (@var{arg})
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21 ## Convert @var{arg} to a logical value. For example,
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22 ##
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23 ## @example
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24 ## logical ([-1, 0, 1])
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25 ## @end example
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26 ##
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27 ## @noindent
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28 ## is equivalent to
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29 ##
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30 ## @example
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31 ## [-1, 0, 1] != 0
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32 ## @end example
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33 ## @end deftypefn
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34
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35 ## Author: jwe
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36
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37 function y = logical (x)
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38
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39 if (nargin == 1)
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40 if (islogical (x))
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41 y = x;
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42 elseif (isempty (x))
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43 y = zeros (size (x), "logical");
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44 elseif (isnumeric (x))
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45 if (any (isnan (x(:))))
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46 error ("invalid conversion from NaN to logical");
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47 else
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48 y = x != 0;
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49 endif
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50 else
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51 error ("logical not defined for type `%s'", typeinfo (x));
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52 endif
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53 else
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54 print_usage ();
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55 endif
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56
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57 endfunction
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58
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59 %!assert (logical ([]), zeros ([0, 0], "logical"));
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60 %!assert (logical (zeros (2, 0)), zeros ([2, 0], "logical"));
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61 %!assert (logical (0), false);
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62 %!assert (logical (13), true);
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63 %!assert (logical (-13), true);
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64 %!assert (logical (int8 (13)), true);
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65 %!assert (logical (int8 (-13)), true);
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66 %!assert (logical ([-1, 0, 1, Inf]), [-1, 0, 1, Inf] != 0);
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67 %!error (logical ([-1, 0, 1, NaN, Inf]))
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68 %!error (logical (NaN))