It's certainly incomplete, but I started working on a CAS (Computer Algebra System: http://en.wikipedia.org/wiki/Computer_algebra_system) that was "backed" by commons-math: https://github.com/wspeirs/math
The JJT (parser file for JavaCC) file can be found here, and is fairly complete if I remember correctly: https://raw.githubusercontent.com/wspeirs/Math/master/src/main/java/com/educatedsolutions/parser/Math.jjt I'd be happy to help you with it further and/or accept pull requests to improve it :-) Bill- On Mon, Jul 21, 2014 at 1:59 AM, Ted Dunning <ted.dunn...@gmail.com> wrote: > On Sun, Jul 20, 2014 at 9:18 PM, Mansour Al Akeel < > mansour.alak...@gmail.com > > wrote: > > > As Luc said, it will big project to write a parser that takes any > > equation as a string, and generate the matrix (2-dimensional array) to > > feed it into Commons Math. > > > > > It actually isn't a big project. > > See http://www.antlr.org/ > > The simplest example they give there is this one: > > *grammar Expr;* > *prog: (expr NEWLINE)* ; * > *expr: expr ('*'|'/') expr * > * | expr ('+'|'-') expr * > * | INT | '(' expr ')' ; * > *NEWLINE : [\r\n]+ ; INT : [0-9]+ ;* > > This will compile into a java program that parses expressions very much > like what you want. >
