I have been working on some numerical problems in the last few weeks. Mostly related to curve fitting and interpolation. I am slowly sliding back to Java bit-by-bit though I am not sure if I will give up Python as the syntax is so tight and it is actually very fast.
Anyway, I was looking around for some curve fitting and interpolation code on the Net and found Michael Flannigan’s website which has a great resource of math, stats, optimization and some other more subtle items. His Java code is here.
I can’t even do it justice by showing the list of packages as it is about twice as long as the screen capture shown to the right.
There is a neat way that an application/applet can be written such that it can run as a GUI in a web page or as a GUI application. Create the Test.java code as:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.applet.*; public class Test extends JFrame { public Test() { } public static void main(String args[]) { JFrame jf = new JFrame(); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); TestApplet app = new TestApplet(); app.init(); jf.getContentPane().add("Center", app); jf.setSize(600,600); jf.setVisible(true); jf.repaint(); } } |
and create the TestApplet.java code as:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | import javax.swing.*; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import java.awt.GridLayout; import java.awt.event.*; import java.awt.Font; public class TestApplet extends JApplet implements ActionListener, DocumentListener { JPanel main_panel = null; public TestApplet() { createTestApplet(); } public void init() { } private void createTestApplet() { // Create the two panels, one for input and the other for gradient // table output main_panel = new JPanel(new GridLayout(1,2)); add( main_panel ); } public void insertUpdate(DocumentEvent e ) { changedUpdate(e); } public void removeUpdate(DocumentEvent e ) { changedUpdate(e); } public void changedUpdate(DocumentEvent e) { } public void actionPerformed(ActionEvent e) { } } |
And then to compile it, just do:
1 | $ javac Test.java |
And now to run it
You can either run it from the command line:
1 | $ java Test |
or create a web page:
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