mep4j

Math Expression Parser 4 Java

MEP4J is a high performance math expression strings parser for Java (J2SE >= 5).
Compare its performance against similiar libraries and let me know your experince.

The library manages the 5 operators (+, -, /, %, *) together with the following functions:
- "abs"
- "cos"
- "sin"
- "acos"
- "asin"
- "cosh"
- "sinh"
- "tan",
- "tanh"
- "atan"
- "sqrt"
- "cbrt"
- "root"
- "log"
- "log10"
- "log1p"
- "exp"
- "expm1"
- "atan2"
- "pow"

The library supports variables (case insensitive), custom and pre-loaded ("e" and "pi").

Example:

int num_variations = 100;
int init_value = 10;
MathParser mathParser = new MathParser();
mathParser.putVariable("x", init_value);
mathParser.parse("2 + (7 - 5) * 3.14159 * pow(x, (12-10)) + sin(-3.141)");
for(int i = init_value; i < num_variations; ++i) {
Double result = mathParser.execute();
mathParser.putVariable("x", i);
}