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> From: Mark S. Johnson <mjohnson@calpoly.edu>
> To: oon-list@oonumerics.org
> Subject: OON: Object Oriented Equation Parsing
> Date: Wednesday, April 30, 1997 9:47 PM
>
>
> I would like to write some code to parse mathematical expressions and
> place the results into meaningful objects. Better yet, I'd rather use
> someone else's code to do this! :-)
>
> Sample line to parse: (pseudo-Maple-style syntax)
>
> x * y + exp(x) = 5;
>
We wrote our InC++ interval solvers (for solving optimization problem,
equation sets and interval constraint satisfaction problems) using Lex
(lexical analysis) and Yacc (parser) metacompilers (standard tools
available with C/C++ compilers). This a simple way to extract the structure
of an expression in C++ world, another way would be to overload
operators/function to do parsing based on their arguments. For example, to
create a function to be minimized/maximized or to solve an equation pair
one can create the following objects:
IFunction myFunction("y=x^2+x*y^2-sin(x)");
Ice myEquationSet (2, "a+sin(b)=2", "b^2+a*b<a");
Free evaluation versions and user guides of the InC++ libraries are
available at
Yours
Eero Hyvonen
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