1   /*
2    * @(#) Function.java Apr 20, 2004
3    * 
4    * Copyright (c) 2003 Delft University of Technology Jaffalaan 5, 2628 BX Delft,
5    * the Netherlands All rights reserved.
6    * 
7    * This software is proprietary information of Delft University of Technology
8    * The code is published under the General Public License
9    */
10  package nl.tudelft.simulation.jstats.ode;
11  
12  
13  /***
14   * <p>
15   * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
16   * University of Technology </a>, the Netherlands. <br>
17   * See for project information <a
18   * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
19   * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
20   * License (GPL) </a>, no warranty <br>
21   * 
22   * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
23   *         Jacobs </a>
24   * @version 1.2 Apr 20, 2004
25   * @since 1.4
26   */
27  public class Function extends DifferentialEquation
28  {
29  	/***
30  	 * constructs a new Function
31  	 * 
32  	 * @param stepSize the stepSize
33  	 * @param integrationMethod the methodOfIntegration
34  	 */
35  	public Function(final double stepSize, final short integrationMethod)
36  	{
37  		super(stepSize, integrationMethod);
38  		super.initialize(0, new double[]{0.5, 1.5});
39  	}
40  
41  	/***
42  	 * @see nl.tudelft.simulation.jstats.ode.DifferentialEquationInterface#dy(double,
43  	 *      double[])
44  	 */
45  	public double[] dy(final double x, final double[] y)
46  	{
47  		return new double[]{y[1], -0.2 * y[1] - Math.sin(y[0])};
48  	}
49  }