Documentation

A library for evaluating math expressions.

Using the library

fn main() {
  let input = "sin(0.2)^2 + cos(0.2)^2";
  let expr = ShuntingParser::parse_str(input).unwrap();
  let result = MathContext::new().eval(&expr).unwrap();
  println!("{} = {}", expr, result);
}

A MathContext

MathContext allows keeping context across multiple invocations to parse and evaluate. You can do this via the setvar method.

The tool in the crate

The crate also ship with the tox binary with a math repl.

$ tox
>> 4!
24
>> a = sin(0.2)^2 + cos(0.2)^2
>> a
1
>> (-3)!
NaN
>> (84 % (5/2)) !
1.32934
>> pi * 2.1^2 / cbrt(-(6+3))
-6.660512