如何用JFreeChart画正态分布图??

Question

http://www.java2s.com/Code/Java/Chart/JFreeChartNormalDistributionDemo.htm
NormalDistribution就是正太分布的意思建议以后此类问题 都去官网查找demo
一般来说都有完备的例子的

Answer 1

package org.jfree.chart.demo;import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.function.Function2D;
import org.jfree.data.function.NormalDistributionFunction2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;/**
 * This demo shows a normal distribution function.
 */
public class NormalDistributionDemo extends ApplicationFrame {    /**
     * A demonstration application showing a normal distribution.
     *
     * @param title  the frame title.
     */
    public NormalDistributionDemo(final String title) {        super(title);
        Function2D normal = new NormalDistributionFunction2D(0.0, 1.0);
        XYDataset dataset = DatasetUtilities.sampleFunction2D(normal, -5.0, 5.0, 100, "Normal");
        final JFreeChart chart = ChartFactory.createXYLineChart(
            "XY Series Demo",
            "X", 
            "Y", 
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false
        );        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);    }    // ****************************************************************************
    // * JFREECHART DEVELOPER GUIDE                                               *
    // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
    // * to purchase from Object Refinery Limited:                                *
    // *                                                                          *
    // * http://www.object-refinery.com/jfreechart/guide.html                     *
    // *                                                                          *
    // * Sales are used to provide funding for the JFreeChart project - please    * 
    // * support us so that we can continue developing free software.             *
    // ****************************************************************************
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {        final NormalDistributionDemo demo = new NormalDistributionDemo("Normal Distribution Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);    }}