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/*
* 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 "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 (-zimags(zatans(DoubleComplex(0.0, -x))));
}
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