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1 ## Copyright (C) 1996, 1997 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 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} logical (@var{arg}) |
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22 ## Convert @var{arg} to a logical value. For example, |
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23 ## |
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24 ## @example |
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25 ## logical ([-1, 0, 1]) |
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26 ## @end example |
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27 ## |
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28 ## @noindent |
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29 ## is equivalent to |
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30 ## |
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31 ## @example |
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32 ## [-1, 0, 1] != 0 |
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33 ## @end example |
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34 ## @end deftypefn |
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35 |
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36 ## Author: jwe |
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37 |
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38 function y = logical (x) |
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39 |
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40 if (nargin == 1) |
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41 if (islogical (x) || isempty (x)) |
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42 y = x; |
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43 elseif (isnumeric (x)) |
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44 y = x != 0; |
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45 else |
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46 error ("logical not defined for type `%s'", typeinfo (x)); |
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47 endif |
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48 else |
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49 print_usage (); |
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50 endif |
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51 |
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52 endfunction |
