function plot

[Fu-Kwun Hwang]

You can use this applet to draw y(x) or x(t),y(t) function plot
-*-

Embed a running copy of this simulation
<applet code='users.ntnu.fkh.functionplot_pkg.functionplotApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/2/ejs_functionplot.jar' name='functionplot1182' id='functionplot1182' width='640' height='480' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=1182' target='smfejs'>Run simulation</a>

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.

Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

[lookang]

can enable the load ejs applet xml file ?

i trying to learn how to make a quadratic equation 

thanks

[Fu-Kwun Hwang]

Sorry! I forgot to upload the xml file. It is done. You should be able to load it now.
I am working on another EJS web  interface so that it will be easy to read the EJS source (without loading the java and show similar interface). May be add editable function later on. It is a work in progress.

[lookang]

the current system you have is good, i have learned much here.

will give back to the community here 

thanks

[lookang]

strange, is the xml file working ?


Generating simulation file
  D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java ...
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:331: <identifier> expected
  public javax.swing.JPanel Y(x);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:331: ')' expected
  public javax.swing.JPanel Y(x);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:336: <identifier> expected
  public javax.swing.JLabel Y(x)=;
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:336: ')' expected
  public javax.swing.JLabel Y(x)=;
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:349: <identifier> expected
  public javax.swing.JPanel X(t),Y(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:349: ')' expected
  public javax.swing.JPanel X(t),Y(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:355: <identifier> expected
  public javax.swing.JLabel X(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:355: ')' expected
  public javax.swing.JLabel X(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:360: <identifier> expected
  public javax.swing.JLabel Y(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:360: ')' expected
  public javax.swing.JLabel Y(t);
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:558: illegal start of expression
  Y(x)= = (javax.swing.JLabel)
  ^
D:\EasyJavaSimulation\Ejs3.46_070428\Ejs\Simulations\_apps\_examples\functionplot.app\functionplot.java:644: ';' expected
  X(t),Y(t) = (javax.swing.JPanel)
  ^
12 errors
Compilation produced an error!

[lookang]

i did it!!!

need to rename the the "labels" for the panels.

after changing them, it works!!

think it is due to a stricter naming system employed by EJS 3.46 compared to 3.40.

the trick is look out for () =, the new naming convention in EJS 3.46 disallows

yeah!!

[Fu-Kwun Hwang]

Ejs use the label for your element to define variable name for the created code.
So please use old standard name convention (beginning with an alphabetic character. and containing letters or numbers only.)

If you define a label as f(x) for a TextField. EJS will generate something like
TextField f(x);
The java will interprete f(x) as a function need to be called (instead of variable name).
That is why it produce error message when compiling the code.