Java examples for java.lang:Math Calculation
Calculates e^x, faster but less accurate than MathUtil#exp(double)
/*//from ww w . j av a 2 s .c o m * Created on 02-May-2006 at 17:31:01. * * Copyright (c) 2010 Robert Virkus / Enough Software * * This file is part of J2ME Polish. * * J2ME Polish 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 2 of the License, or * (at your option) any later version. * * J2ME Polish 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 J2ME Polish; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Commercial licenses are also available, please * refer to the accompanying LICENSE.txt or visit * http://www.j2mepolish.org for details. */ //package com.java2s; public class Main { /** * Calculates e^x, faster but less accurate than {@link MathUtil#exp(double)} * @param x x * @return e^x */ public static double fastexp(double x) { return (362880 + x * (362880 + x * (181440 + x * (60480 + x * (15120 + x * (3024 + x * (504 + x * (72 + x * (9 + x))))))))) * 2.75573192e-6; } }