import javax.swing.*;import java.awt.*;/** * Title:        Graph<p> * Description:  Simple program to produce a graph for the book<p> * Copyright:    Copyright (c) Mark Watson<p> * Company:      <p> * @author Mark Watson * @version 1.0 */public class Graph extends JFrame {    GraphPanel jPanel1;    float[] data1;    float[] data2;    public Graph() {        try {            int size = 500;            data1 = new float[size];            data2 = new float[size];            float xmin = -5;            float xmax = 5;            for (int i = 0; i < size; i++) {                float x = i;                x = xmin + x * (xmax - xmin) / (float) size;                data1[i] = sigmoid(x);                data2[i] = sigmoidP(x);            }            jbInit();        } catch (Exception e) {            e.printStackTrace();        }    }    protected float sigmoid(float x) {        return                (float) ((1.0f / (1.0f + Math.exp((double) (-x)))) - 0.5f);    }    protected float sigmoidP(float x) {        double z = sigmoid(x) + 0.5f;        return (float) (z * (1.0f - z));    }    public static void main(String[] args) {        Graph untitled11 = new Graph();    }    private void jbInit() throws Exception {        jPanel1 = new GraphPanel(data1, data2);        jPanel1.setBackground(Color.white);        this.setDefaultCloseOperation(3);        this.getContentPane().add(jPanel1, BorderLayout.CENTER);        setSize(550, 300);        jPanel1.setVisible(true);        setVisible(true);    }}