Mercurial > octave-nkf
view scripts/specfun/reallog.m @ 16033:23a7661e529a ss-3-7-2
snapshot version 3.7.2
* configure.ac (AC_INIT): Set version to 3.7.2.
(OCTAVE_RELEASE_DATE): Set to 2013-02-09.
(OCTAVE_COPYRIGHT): Update year.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Sun, 10 Feb 2013 00:59:19 -0500 |
parents | f3d52523cde1 |
children | d63878346099 |
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## Copyright (C) 2008-2012 David Bateman ## ## 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 3 of the License, 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, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} reallog (@var{x}) ## Return the real-valued natural logarithm of each element of @var{x}. Report ## an error if any element results in a complex return value. ## @seealso{log, realpow, realsqrt} ## @end deftypefn function y = reallog (x) if (nargin != 1) print_usage (); elseif (iscomplex (x) || any (x(:) < 0)) error ("reallog: produced complex result"); else y = log (x); endif endfunction %!assert (log (1:5), reallog (1:5)) %!test %! x = rand (10,10); %! assert (log (x),reallog (x)); %!error <produced complex result> reallog (-1)