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/*
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2008-2008 - 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
*
*/
/*
// cosh(z) = 0.5 (exp(|z|) + exp(-|z|))
// = 0.5 ( y + 1/y ) with y = exp(|z|)
*/
#include <math.h>
#include "cosh.h"
#include "exp.h"
#include "abs.h"
#include "types.h"
float i8coshs(int8 x) {
double y = i8exps(i8abss(x));
return (0.5 * (y + 1.0/y));
}
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