Finding the single unknown in an equation

Question

I need a library to be able to parse an equation an give me the result giving the inputs.

For example something like this:

String equation = "5 = 6 / z"; 

EquationSolver solver = new EquationSolver(equation); 

double result = solver.getResult(); 

System.out.println("result: " + result);

And evaluates to: 6/5

Is there any kind of library for java that can do that for me? Basically I need the program to isolate the single unknown variable in an arbitrary equation...

Thanks Thomas

score 1 · Answer 1 · answered Aug 04 '11 at 21:32

1

What you're looking for is a computer algebra system.

Wikipedia lists some options. I would check out Java Algebra System

answered Aug 04 '11 at 21:32

wjin

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score 1 · Answer 2 · answered Nov 18 '11 at 05:45

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You need a Java expression Library for this. I found MVEL to be a good Java Expression Library

You can check this link for other java expression libraries. http://java-source.net/open-source/expression-languages

answered Nov 18 '11 at 05:45

ravia

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score 0 · Answer 3 · edited Jun 24 '11 at 06:38

0

Have a look at JPELite.

JEPLite: java expression parser enlited.

edited Jun 24 '11 at 06:38

Gregory Pakosz

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answered Jun 24 '11 at 06:36

alphazero

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score 0 · Answer 4 · answered Jun 24 '11 at 06:39

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Not sure if you'll find one that's as easy to use as you want, but http://jscl-meditor.sourceforge.net/#mozTocId312653 appears to provide polynomial solving: let me know if that works for you (and how!).

Alternatively JScience may do what you want.

answered Jun 24 '11 at 06:39

Femi

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I've tried to figure out JScience but found it very poorly documented...I can't find samples or anything to guide me :( – evildrsauss Jun 24 '11 at 08:56

Finding the single unknown in an equation

4 Answers4