Equation Parser

[Rafael Afonso]

Hello:
Anyone knows if there is a package (or library, or bean) to parser a mathematical equation? What I want is to do something like this:

 
   String equation = "x^2*sin(y /(2 * Pi))"; // x and y are variables; sin is Sinus and Pi a constant.
   Calculator colculator = new Calculator(); // Object that will do equation.
   calculator.setEquation(equation);
   calculator.setElement("x", 10);
   calculator.setElement("y", 10 * Math.PI);
   double result = calculator.calculate();
 

Thanks,
[ September 11, 2002: Message edited by: Rafael Afonso ]

[Dave Landers]

If you can represent your equation in java syntax, you could try Bean Shell

[Dave Landers]

I was going to post an example from the bean shell docs, but JavaRanch won't accept it - keeps telling me that I have a < or > that I am supposed to use &lt; or &gt; with but I had none of that in there. Aarrrgh!
The example is the one at http://www.beanshell.org/manual/embeddedmode.html#Calling_BeanShell_From_Java
[ September 11, 2002: Message edited by: Dave Landers ]