What library can parse & solve a simple math expression in C++ [closed]

Question

I have an arbitrary expression in a string. Let's say: y=12*x+34 I will have x or y and I need to solve for the other. muParser does a brilliant job of solving the first form given x but it and all the other math parsers I've found cannot perform any sort of manipulation to turn the expression into: x=(y-34)/12 so the other could be solved if I had y instead of x.

Is there a C/C++ library out there that isn't GNU encumbered that can be used to solve this?

Fi

You can check the tutorial on how to create an own compiler with LLVM. It basically does just this, iirc. You probably have to extend it a lot, though. See here: llvm.org/docs/tutorial/LangImpl1.html – Vassell

Answer 1

It looks like you want to embed a proper CAS. Try GiNaC, if it is not powerful enough, think of embedding Maxima or Axiom (both are very heavyweight and runs on top of Common Lisp).

Preponderate

Unfortunately GiNaC is GNU encumbered. – Fi

@hsikcah, then probably your best bet is to use a heavyweight CAS (license does not matter) spawned in a separate process, and communicate with it via a socket or a pipe. – Preponderate

I hope to find some simple lightweight CAS to do the job. In my case it's fairly simple algebra - the need for a 100mb math processing package capable of putting a man on Mars sounds like a bit of overkill. – Fi

@hsikcah, GiNaC was the smallest I've ever met. Chances are you've got to write your own library. It is not that complicated. – Preponderate