Mihai Mobile

I just released version 1.3.0 of the Arity library, with a major addition: Complex Numbers. In addition to basic operators on complex numbers (like addition, multiplication, division), all the standard function are supported: trigonometric & hyperbolic, logarithm, exponential & power, factorial (Gamma), and even combinations, permutations and GCD. It is nice that many analytic functions behave better on the complex domain than on the real domain: for example, the logarithm is defined for negative arguments, asin() can take arguments greater than 1, and a negative number can be raised to any power (which results in NaN on reals).

Ever wondered how much is: e^(i*pi), log(-1), i!, i^i, sinh(i*pi)? You can download the arity-1.3.0.jar, and evaluate any expression like this:

java -jar arity-1.3.0.jar "e^(i*pi)"

An essential trait of Arity is that it works on MIDP devices (mobile phones) which have limited RAM & CPU. As such, it has a lightweight and efficient implementation. For example, the Complex class (implementing the complex operations) is done in a way that avoids new object creation, which is different from some other Complex Java libraries I’ve seen.

Enjoy!