in ejs how to show to number as a power of 10?

[Fred Chuit]

Dear Sir,

I am just starting to build applets with ejs, it's a wonderful program.
I would like some numbers (double) to be shown on screen as a power of 10.
For instance:
23000 as: 2,3•10^4  (if possible 4 as exponent)
0,00356 as: 3,6•10^-3 (-3 as exponent).

Further, is there a way to have a numberfield also accept(and show) the "," instead of the"."?
So: 34,5 instead of 34.5

It would be great if I could get some simple examples to solve this problems.
Already many thanks for the help.
Greetings,
Fred

[Fu-Kwun Hwang]

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

This is what I will do: define a function to convert your value to a string.

For example: define variables in the model
e (double): 1.602e-19
s (String): d2s(v)  // to be used to show e as a String

public String d2s(double v){
 double a;
 int b;
 String o;
 b=(int)(Math.log(v)/Math.log(10.)); // get the value as power of 10
 if(b<0)b=b-1;
 a=d2v(v/Math.pow(10,b));
 o=a+"";
 return o.replace(".",",")+"*10^{"+b+"}";  // convert "." to ","
}
public double d2v(double v){//  for 3 digits displayed max.
 double dv;
 if(v>0)dv=0.5;
 else if(v<0)dv=-0.5;
 else dv=0;
 return (int)(v*1000+dv)/1000.;
}

Add a Text element into DrawingPanel, and set it's text to %s%
You should be able to find 1.602*10^-19 in the drawingPanel when you run it.

EJS support (^ or _) for  (superscript or subscript) . Try it at title for PlotingPanel, text element. etc.

I also found "." will be switch to "," for value displayed in slider/Bar/...  when you switch locale from en_EN to es_ES. (I think it will work the same if you select the right locale before running EJS).

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

[Fred Chuit]

Dear mr. Fu-Kwun Hwang,

Many thanks for you advice and help!
This really solves the problem, I couldn't fix.

Again, thanks for your fast reply!
Greetings from Holland,
Fred