public ExponentialDistributionDemo() {
super(new BorderLayout());
Hashtable<Integer, JLabel> labelTable = new Hashtable<Integer, JLabel>();
for (int i = 0; i <= 50; i += 10) {
labelTable.put(new Integer(i), new JLabel(String.valueOf(i / 10)));
}
lambdaSlider = new JSlider(0, 50, (int) Math.round(lambda * 10));
lambdaSlider.addChangeListener(this);
lambdaSlider.setLabelTable(labelTable);
lambdaSlider.setMajorTickSpacing(10);
lambdaSlider.setMinorTickSpacing(2);
lambdaSlider.setPaintTicks(true);
lambdaSlider.setPaintLabels(true);
optionPane = new JPanel(new FlowLayout(FlowLayout.LEFT));
optionPane.setBorder(BorderFactory.createRaisedBevelBorder());
optionPane.add(new JLabel("\u03BB:"));
optionPane.add(lambdaSlider);
add(optionPane, BorderLayout.NORTH);
canvas = new JPanel(new GridLayout(2, 2));
add(canvas, BorderLayout.CENTER);
ExponentialDistribution dist = new ExponentialDistribution(lambda);
double[][] p = new double[100][2];
double[][] q = new double[100][2];
for (int i = 0; i < p.length; i++) {
p[i][0] = i / 20.0;
p[i][1] = dist.p(p[i][0]);
q[i][0] = i / 20.0;
q[i][1] = dist.cdf(p[i][0]);
}
pdf = LinePlot.plot(p, Line.Style.SOLID, Color.BLUE);
pdf.setTitle("PDF");
canvas.add(pdf);
cdf = LinePlot.plot(q, Line.Style.SOLID, Color.BLUE);
cdf.setTitle("CDF");
canvas.add(cdf);
double[] data = new double[500];
for (int i = 0; i < data.length; i++) {
data[i] = dist.rand();
}
histogram = Histogram.plot(data, 20);
histogram.setTitle("Histogram");
canvas.add(histogram);
qqplot = QQPlot.plot(data, dist);
qqplot.setTitle("Q-Q Plot");
canvas.add(qqplot);
}
@Override
public void stateChanged(ChangeEvent e) {
if (e.getSource() == lambdaSlider) {
lambda = lambdaSlider.getValue() / 10.0;
if (lambda == 0) lambda = 0.01;
ExponentialDistribution dist = new ExponentialDistribution(lambda);
double[][] p = new double[100][2];
double[][] q = new double[100][2];
for (int i = 0; i < p.length; i++) {
p[i][0] = i / 20.0;
p[i][1] = dist.p(p[i][0]);
q[i][0] = i / 20.0;
q[i][1] = dist.cdf(p[i][0]);
}
pdf.clear();
pdf.line(p, Line.Style.SOLID, Color.BLUE);
cdf.clear();
cdf.line(q, Line.Style.SOLID, Color.BLUE);
double[] data = new double[500];
for (int i = 0; i < data.length; i++) {
data[i] = dist.rand();
}
histogram.clear();
histogram.histogram(data, 20, Color.BLUE);
qqplot.clear();
qqplot.add(new QQPlot(data, dist));
canvas.repaint();
}
}