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Date: Tue, 27 Mar 2012 08:18:04 -0400
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Subject: Re: [math] Improvement: Interpreter for mathematical expressions
From: Gary Gregory <garydgregory@gmail.com>
To: Commons Developers List <dev@commons.apache.org>
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On Tue, Mar 27, 2012 at 5:50 AM, sebb <sebbaz@gmail.com> wrote:

> 2012/3/27 "Detlef G=C3=BCnther" <Detlef.Guenther@gmx.net>:
> > Hello,
> >
> > it would be nice to have an interpreter for mathematical expressions so
> that functions may be defined at runtime.
> >
> > Example for f(x):
> >
> >  ExpInter ei =3D new ExpInter();
> >  ei.setFunction("ln(3*sin(2*x)+3)");
> >  // Plot the function:
> >  for (double x=3D0.0;x<3.0;x+=3D0.1) {
> >    y =3D ei(x);
> >    // ... do something useful with x,y
> >  }
> >
>
> Seems completely out of scope for Math to me.
>
> Besides, there are already scripting languages such as Commons JEXL
> and BeanShell.
>

JavaScript is also baked in Java 6 and you can use any Java scripting
enabled engine.

Gary


> These can call just about any method you want, and BeanShell allows
> one to define functions.
>
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