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logical.m
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1998-11-20
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## Copyright (C) 1996, 1997 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: logical (arg)
##
## Convert ARG to a logical value. For example,
##
## logical ([-1, 0, 1])
##
## is equivalent to
##
## [-1, 0, 1] != 0
## Author: jwe
function y = logical (x)
if (nargin == 1)
if (! islogical (x))
y = x != 0;
else
y = x;
endif
else
usage ("logical (x)");
endif
endfunction