Parser

The Mathematical Expression Parser (a C++ library with full source code and stand alone test app) can parse numerical expressions or functions such as "sqrt( sin( 1.2e-3) - 2*y)", containing variables with arbitrary names. It is written with function plotters, spreadsheets and curve fitters in mind -- programs that need to very quickly evaluate the same function many times, changing the values of variables in between. Evaluation speeds are typically 30-90% as fast as directly compiled code. (The included test application allows you to check this claim for yourself.) Thus, this is among the fastest parsers available, yet safe since it checks for error conditions such as division by zero before conducting these operations. Supports: +, -, *, /, %, ^ (power), -(unary), !, &&, ||, ==, !=, <=, >=, <. >, ?: (for piecewise continuous functions), &, |, !& (XOR), ~, exp, ln, log, abs, sqrt, ceil, floor, rand, sin, cos, tan, sec, csc, cot, asin, acos, atan, asec, acsc, acot, sinh, cosh, tanh, sech, csch, coth, and the following predefined constants: e, pi, true and false. Variables may have any name and are not limited in number. Parenthesis are handled to arbitrary depths. The library also does symbolic math and can take partial derivatives. You can scrap the numerical methods and use this library to directly evaluate derivatives at near compiled speeds! All calculations (except bitwise operations) are done with double precision floating point math. The included project file requires CW Pro 5, but the code base should compile on pretty much anything on any system. This code base is shareware, but is free for deployment in freeware applications. Enjoy, Ian Ollmann iano@cco.caltech.edu