ekump / bigdecimalmath-rs

Mathematical functions for BigDecimals

BigDecimalMath-RS

Documentation

A collection of mathematical functions for the BigDecimal type. These functions are Rust implementations of Richard J. Mathar's A Java Math.BigDecimal Implementation of Core Mathematical Functions. Where necessary, some functions from OpenJDK's implementation of BigDecimal have also been reimplemented here.

Note

I write Rust code regularly, but I am not an expert in either Java or numerical analysis. I created this repo because certain mathematical functions are not present in bigdecimal-rs that I need for another side project I'm working on. Contributions, feature requests, and bug reports are welcome, but I have a day job and cannot promise quick turnarounds.

bigdecimalmath-rs's Issues

BigDecimal-RS round function cannot handle values with high precision

While attempting to implement the natural logarithm function I quickly ran into an issue where the round function in BigDecimal-RS panics. This is because it attempts to cast the BigInt component of the BigDecimal to an i128, which has a max value of 170,141,183,460,469,231,731,687,303,715,884,105,727. Before we can move forward with the natural logarithm functionality we are going to have to implement rounding in BigDecimalMath that isn't bound by i128 maximum values.