Here you can find the source of tanht(double temp)
public static double tanht(double temp)
//package com.java2s; /*/* w w w. j ava2 s .c o m*/ * * *** BEGIN LICENSE * Copyright (C) 2012 Spyridon Samothrakis spyridon.samothrakis@gmail.com * This program is free software: you can redistribute it and/or modify it * under the terms of the GNU General Public License version 3, as published * by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranties of * MERCHANTABILITY, SATISFACTORY QUALITY, 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 this program. If not, see <http://www.gnu.org/licenses/>. * *** END LICENSE * */ public class Main { private static double TANH[]; public static double tanht(double temp) { if (temp < -10) return TANH[0]; else if (temp >= 10) return TANH[9999]; else return TANH[(int) (temp * 500) + 5000]; // return Math.tanh(temp); } }