package ac.essex.graphing.charts.continuous; 
 
import ac.essex.graphing.plotting.ContinuousFunctionPlotter; 
 
/** 
 *  
 * <p/> 
 * This program 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, 
 * provided that any use properly credits the author. 
 * This program 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 at http://www.gnu.org 
 * </p> 
 * 
 * @author Olly Oechsle, University of Essex, Date: 05-Jun-2007 
 * @version 1.0 
 */ 
public class SigmoidFunction extends ContinuousFunctionPlotter { 
 
    public double getY(double x) { 
 
        return 1 / (1 + Math.exp(-x)); 
 
    } 
 
    public String getName() { 
        return "Sigmoid Function"; 
    } 
 
 
}