diff options
Diffstat (limited to 'src/elementaryFunctions/atanh/datanhs.c')
| -rw-r--r-- | src/elementaryFunctions/atanh/datanhs.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/src/elementaryFunctions/atanh/datanhs.c b/src/elementaryFunctions/atanh/datanhs.c index c6d80c77..e5eddf39 100644 --- a/src/elementaryFunctions/atanh/datanhs.c +++ b/src/elementaryFunctions/atanh/datanhs.c @@ -1,18 +1,23 @@ /* -** -*- C -*- -** -** datanhs.c -** Made by Bruno JOFRET <bruno.jofret@inria.fr> -** -** Started on Thu Dec 7 12:02:41 2006 jofret -** Last update Thu Sep 6 15:12:05 2007 bruno -** -** Copyright INRIA 2006 -*/ + * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab + * Copyright (C) 2006-2008 - INRIA - Bruno JOFRET + * + * This file must be used under the terms of the CeCILL. + * This source file is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at + * http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt + * + */ -#include <math.h> #include "atanh.h" - +#include "atan.h" +/* +// METHOD +// based on the formula atanh(z) = i atan(-i z) +// +// Real case : atanh(x) = -imag(atan(-i x)) +*/ double datanhs(double x) { - return (atanh(x)); + return (-zimags(zatans(DoubleComplex(0.0, -x)))); } |