rbfunction.java

This program demonstrates some function approximation capabilities of a Radial Basis Function Networ

// Decompiled by JAD v1.5.4.3. Copyright 1997-98 Pavel Kouznetsov.
// JAD Home Page:      http://web.unicom.com.cy/~kpd/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   RBFunction.java
// Decompiled by S.Baehni in order to be compliant with Java1.2

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class RBFunction extends Applet
{

    public void init()
    {
        net = new Network();
        datadisp = new DataDisp(true, "Data Points", 500, 243);
        centerdisp = new DataDisp(false, "Basis Functions", 500, 81);
        options = new Panel();
        options.setBackground(Color.white);
        GridBagLayout gridbaglayout = new GridBagLayout();
        GridBagConstraints gridbagconstraints = new GridBagConstraints();
        options.setLayout(gridbaglayout);
        gridbagconstraints.fill = 1;
        Label label = new Label("       Number of Centers:");
        Label label1 = new Label("      Standard Deviation:");
        center_field = new TextField(Integer.toString(numcen), 3);
        stddev_field = new TextField(Double.toString(stddev), 5);
        gridbagconstraints.weightx = 1.0D;
        gridbaglayout.setConstraints(label, gridbagconstraints);
        options.add(label);
        gridbaglayout.setConstraints(center_field, gridbagconstraints);
        options.add(center_field);
        gridbaglayout.setConstraints(center_field, gridbagconstraints);
        options.add(label1);
        gridbagconstraints.gridwidth = 0;
        gridbaglayout.setConstraints(stddev_field, gridbagconstraints);
        options.add(stddev_field);
        buttons = new Panel();
        buttons.setBackground(Color.white);
        GridBagLayout gridbaglayout1 = new GridBagLayout();
        GridBagConstraints gridbagconstraints1 = new GridBagConstraints();
        buttons.setLayout(gridbaglayout1);
        gridbagconstraints1.fill = 1;
        clear_button = new Button("Reset");
	ActionListener clearListener = new ActionListener() {
		public void actionPerformed(ActionEvent e) {
		    datadisp.reset();
		}
	};	
	clear_button.addActionListener(clearListener);
        gridbagconstraints1.weightx = 1.0D;
        gridbaglayout1.setConstraints(clear_button, gridbagconstraints1);
        buttons.add(clear_button);
        redraw_button = new Button("Redraw");
	ActionListener redrawListener = new ActionListener() {
		public void actionPerformed(ActionEvent e) {
		    datadisp.redraw();
		    drawbasisfns();
		}
	};
	redraw_button.addActionListener(redrawListener);
        gridbagconstraints1.weightx = 1.0D;
        gridbaglayout1.setConstraints(redraw_button, gridbagconstraints1);
        buttons.add(redraw_button);
        go_button = new Button("Go!");
	ActionListener goListener = new ActionListener() {
		public void actionPerformed(ActionEvent e) {
		    datadisp.redraw();
		    drawbasisfns();
		    double ad[] = new double[numcen];
		    ad = net.trainnet(allcenters, datadisp.trainpoints);
		    if(ad[0] != -1000D)
			{
			    double ad1[] = new double[100];
			    for(int i = 0; i < ad1.length; i++)
				ad1[i] = (10D / ad1.length) * i;
			    
			    net.plotoutput(ad, allcenters, datadisp, ad1);
			}
		}
	};
	go_button.addActionListener(goListener);
        gridbagconstraints1.gridwidth = 0;
        gridbagconstraints1.weightx = 1.0D;
        gridbaglayout1.setConstraints(go_button, gridbagconstraints1);
        buttons.add(go_button);
        status = new Label("RBF Network Applet - (c) 1996 W. Jesse Hong, [e-mail].");
        status.setBackground(Color.white);
        GridBagLayout gridbaglayout2 = new GridBagLayout();
        GridBagConstraints gridbagconstraints2 = new GridBagConstraints();
        setLayout(gridbaglayout2);
        gridbagconstraints2.fill = 1;
        gridbagconstraints2.gridwidth = 0;
        gridbagconstraints2.weightx = 1.0D;
        gridbaglayout2.setConstraints(datadisp, gridbagconstraints2);
        add(datadisp);
        gridbaglayout2.setConstraints(centerdisp, gridbagconstraints2);
        add(centerdisp);
        gridbaglayout2.setConstraints(options, gridbagconstraints2);
        add(options);
        gridbaglayout2.setConstraints(buttons, gridbagconstraints2);
        add(buttons);
        gridbaglayout2.setConstraints(status, gridbagconstraints2);
        add(status);
        drawbasisfns();
    }

    public static void statusMesg(String s)
    {
        status.setText(s);
    }  

    public void drawbasisfns()
    {
        centerdisp.redraw();
        if(center_field.getText() != null)
            try
            {
                numcen = Integer.valueOf(center_field.getText()).intValue();
            }
            catch(NumberFormatException ex)
            {
                numcen = 10;
                center_field.setText(Integer.toString(numcen));
            }
        if(stddev_field.getText() != null)
            try
            {
                stddev = Double.valueOf(stddev_field.getText()).doubleValue();
            }
            catch(NumberFormatException ex)
            {
                stddev = 0.5D;
                stddev_field.setText(Double.toString(stddev));
            }
        double ad[] = new double[100];
        for(int i = 0; i < ad.length; i++)
            ad[i] = (10D / ad.length) * i;

        allcenters = new GaussCenter[numcen];
        double d = 10D / (2D * numcen);
        for(int j = 0; j < numcen; j++)
        {
            allcenters[j] = new GaussCenter(d, stddev);
            allcenters[j].plot(centerdisp, ad);
            d += 10D / numcen;
        }

    }

    public RBFunction()
    {
        numcen = 10;
        stddev = 0.5D;
    }

    private DataDisp datadisp;
    private DataDisp centerdisp;
    private Panel options;
    private TextField center_field;
    private TextField stddev_field;
    private Panel buttons;
    private Button clear_button;
    private Button redraw_button;
    private Button go_button;
    private static Label status;
    public static final int WDTH = 500;
    public static final int HGHT = 400;
    public static final int FOOT = 75;
    private static final int D_CENTERS = 10;
    private static final double D_STDDEV = 0.5D;
    private int numcen;
    private double stddev;
    private GaussCenter allcenters[];
    private Network net;
}