From: Massimiliano Mirra <list@...>
Date: 2002-01-19T21:33:26+09:00
Subject: Re: Solving equation for a variable

On Sat, Jan 19, 2002 at 01:25:37AM +0900, Akimichi Tatsukawa wrote:
> > > Mupad (www.mupad.com, free for personal use) is a CAS that has many of
> > > its algorithms (including the solver AFAICS) implemented in its own
> > > language, so you could glark some principles from it. Look for lib.tar
> > > in the fileset, it has all the .mu files.
> > > 
> > There is also Ginac (www.ginac.de) and HartMath (www.hartath.com), both
> > with full sources available. Ginac in C++ and HartMath in Java so might
> > need to dig some more before finding the algs you're after (if Mupad is
> > more high-level).
> 
> I found another CAS called PARI-GP (http://www.parigp-home.de/)
> with full of C source codes(if OOP is more high-level).

For now I've solved by just p'opening YACAS and letting it perform the
reduction.  It's production code and I needed it up and working
quickly.

I'd like to end up with a pure Ruby solution, though, and I've
downloaded mupad's lib and will have a look at the others as well.

Thanks a lot to you, Robert and Michel for the pointers.

Massimiliano