最小二乘法+.docx

1、最小二乘法+ 数据挖掘-最小二乘法预测完成日期 2014年 4月实验一 成绩预测1实验目的：学会使用最小二乘法进行数据预测2实验内容：根据给出的一系列期中期末成绩，使用最小二乘法求由学生期中成绩预测学生期末成绩的方程，并建立应用程序实现：方程的建立算法；绘制X，Y关系曲线图；提供新数据的预测功能。3实验环境：3.1硬件环境CPU:P41.8GHz内存：4G硬盘空间：40GB3.2软件环境操作系统：Windows7旗舰版开发环境配置：Eclipse应用服务器配置：jdk1.6.0_324程序设计思路及代码编程程序设计思路：使用adodc控件连接数据库，在程序运行初始便从表中将原有数据显示在网格中

2、。界面中设置两个文本框，一个用于输入中期成绩后一个用于输出预测期末成绩。代码编程：import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JScrollPane;import javax.swing.JTable;import javax.swing.JTextField;import javax.swing.Swi

3、ngUtilities;import javax.swing.UIManager;import javax.swing.table.DefaultTableModel;import org.dyno.visual.swing.layouts.Constraints;import org.dyno.visual.swing.layouts.GroupLayout;import org.dyno.visual.swing.layouts.Leading;/VS4E - DO NOT REMOVE THIS LINE!public class window extends JFrame privat

4、e static final long serialVersionUID = 1L; private JLabel jLabel0; private JTable jTable0; private JScrollPane jScrollPane0; private JLabel jLabel1; private JLabel jLabel4; private JLabel jLabel3; private JTextField jTextField1; private JTextField jTextField2; private JButton jButton0; private JText

5、Field jTextField0; private JLabel jLabel2; private JButton jButton1; double x = 72, 50, 81, 74, 94, 86, 59, 83, 65, 33, 88, 81 ; double y = 84, 63, 77, 78, 90, 75, 49, 79, 77, 52, 74, 90 ; double z=0; private static final String PREFERRED_LOOK_AND_FEEL = javax.swing.plaf.metal.MetalLookAndFeel; publ

6、ic window() initComponents(); private void initComponents() setLayout(new GroupLayout(); add(getJLabel0(), new Constraints(new Leading(242, 10, 10), new Leading(12, 12, 12); add(getJLabel4(), new Constraints(new Leading(32, 10, 10), new Leading(388, 10, 10); add(getJLabel2(), new Constraints(new Lea

7、ding(26, 12, 12), new Leading(231, 19, 10, 10); add(getJTextField2(), new Constraints(new Leading(234, 131, 12, 12), new Leading(385, 28, 10, 10); add(getJLabel1(), new Constraints(new Leading(26, 168, 12, 12), new Leading(46, 25, 10, 10); add(getJLabel3(), new Constraints(new Leading(30, 10, 10), n

8、ew Leading(326, 12, 12); add(getJButton0(), new Constraints(new Leading(434, 10, 10), new Leading(325, 12, 12); add(getJScrollPane0(), new Constraints(new Leading(238, 200, 10, 10), new Leading(66, 150, 12, 12); add(getJTextField1(), new Constraints(new Leading(234, 130, 12, 12), new Leading(325, 30

9、, 12, 12); add(getJTextField0(), new Constraints(new Leading(234, 130, 12, 12), new Leading(264, 29, 10, 10); add(getJButton1(), new Constraints(new Leading(431, 10, 10), new Leading(262, 12, 12); setSize(641, 459); private JButton getJButton1() if (jButton1 = null) jButton1 = new JButton(); jButton

10、1.setText(确定); jButton1.addActionListener(new ActionListener() public void actionPerformed(ActionEvent event) double a = getA(x, y); double b = getB(x, y, a); String A = String.format(%.2f, a); String B = String.format(%.2f, b); String S = y= + A + * + x + + + B; jTextField0.setText(String.valueOf(S

11、); ); return jButton1; public static double getA( double x , double y ) int n = x.length ; return ( n * pSum( x , y ) - sum( x ) * sum( y ) ) / ( n * sqSum( x ) - Math.pow(sum(x), 2) ) ; /* * 计算常量系数 * param x * param y * param a * return */ public static double getB( double x , double y , double a )

12、 int n = x.length ; return sum( y ) / n - a * sum( x ) / n ; private static double sum(double c ) double s = 0 ; for( int i=0;ic.length;i+ ) s = s + ci ; return s ; private static double sqSum(double c ) double s = 0 ; for( int i=0;ic.length;i+) s = s + Math.pow(ci, 2) ; return s ; private static do

13、uble pSum( double x , double y ) double s = 0 ; for( int i = 0 ; i x.length ; i+ ) s = s + xi * yi ; return s ; private JLabel getJLabel2() if (jLabel2 = null) jLabel2 = new JLabel(); jLabel2.setText(根据最小二乘法计算得到预测方程为：); return jLabel2; private JTextField getJTextField0() if (jTextField0 = null) jTex

14、tField0 = new JTextField(); return jTextField0; private JButton getJButton0() if (jButton0 = null) jButton0 = new JButton(); jButton0.setText(预测); jButton0.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent e) z=Integer.parseInt(jTextField1.g

15、etText(); double a = getA( x , y ) ; double b = getB( x , y , a ) ; String A = String.format(%.2f, a); String B = String.format(%.2f, b); double m= a * z + b ; String M = String.format(%.2f, m); jTextField2.setText(String.valueOf(M); ); return jButton0; private JTextField getJTextField2() if (jTextF

16、ield2 = null) jTextField2 = new JTextField(); return jTextField2; private JTextField getJTextField1() if (jTextField1 = null) jTextField1 = new JTextField(); return jTextField1; private JLabel getJLabel3() if (jLabel3 = null) jLabel3 = new JLabel(); jLabel3.setText(输入某位学生的期中成绩：); return jLabel3; pri

17、vate JLabel getJLabel4() if (jLabel4 = null) jLabel4 = new JLabel(); jLabel4.setText(该学生期末成绩预测值为：); return jLabel4; private JLabel getJLabel1() if (jLabel1 = null) jLabel1 = new JLabel(); jLabel1.setText(课程数据库中的学生成绩：); return jLabel1; private JScrollPane getJScrollPane0() if (jScrollPane0 = null) jS

18、crollPane0 = new JScrollPane(); jScrollPane0.setViewportView(getJTable0(); return jScrollPane0; private JTable getJTable0() if (jTable0 = null) jTable0 = new JTable(); jTable0.setModel(new DefaultTableModel(new Object 72, 84, , 50, 63, , 81, 77, , 74, 78, , 94, 90, , 86, 75, , 59, 49, , 83, 79, , 65

19、, 77, , 33, 52, , 88, 74, , 81, 90, , , new String 期中成绩X, 期末成绩Y, ) private static final long serialVersionUID = 1L; Class types = new Class Object.class, Object.class, ; public Class getColumnClass(int columnIndex) return typescolumnIndex; ); return jTable0; private JLabel getJLabel0() if (jLabel0 =

20、 null) jLabel0 = new JLabel(); jLabel0.setText(最小二乘法预测学生期末成绩); return jLabel0; private static void installLnF() try String lnfClassname = PREFERRED_LOOK_AND_FEEL; if (lnfClassname = null) lnfClassname = UIManager.getCrossPlatformLookAndFeelClassName(); UIManager.setLookAndFeel(lnfClassname); catch (

21、Exception e) System.err.println(Cannot install + PREFERRED_LOOK_AND_FEEL + on this platform: + e.getMessage(); public static void main(String args) installLnF(); SwingUtilities.invokeLater(new Runnable() Override public void run() window frame = new window(); frame.setDefaultCloseOperation(window.EX

22、IT_ON_CLOSE); frame.setTitle(window); frame.getContentPane().setPreferredSize(frame.getSize(); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); );5程序实现初始运行界面：输入一期中成绩，点击预测：如输入期中成绩89，执行为：6实验总结：通过这次实验，我更加深入的了解了最小二乘法的运算过程，结合着java编程语言，把整个最小二乘法表达出来。在实验过程中运用了窗体，使得人机交互变得更加简洁、方便，也顺便复习了一下窗体的相关知识。当然在实验过程中也发现了自己的不足，因为学习的知识有限，没能画出一元线性图形来，不过希望在以后的学习可以更加完善自己，争取把程序做的更加完善。