JEP is a Java library for parsing and evaluating mathematical
expressions. With this package you can allow your users to enter an
arbitrary formula as a string, and instantly evaluate it. JEP supports
user defined variables, constants, and functions. A number of common
mathematical functions and constants are included.

Now, JEP 3 has finally been released! A bunch of new long-awaited
features have been implemented. Check it out at:

http://www.singularsys.com/jep

New features:
* New faster evaluator
* New configurable parser
* High precision calculations using BigDecimal
* New component architecture
* and much more...

Complete feature list:
* Small size (only 160KB as jar archive)
* Fast evaluation
* High precision using BigDecimals
* Includes common math functions and operators
* Supports Boolean expressions
* Extendable and configurable architecture
* Support for strings, vectors and complex numbers
* Support for implicit multiplication
* Allows declared or undeclared variables
* Java 1.5 compatible
* Supports Unicode characters
* Extensive documentation