Java BigDecimal trigonometric methods

Question

I am developing a mathematical parser which is able to evaluate String like \'5+b*sqrt(c^2)\'. I am using ANTLR for the parsing and make good progress. Now I fe

Answer 1

Using an existing feature of Java BigDecimals, namely to allow limited precision arithmetic as described here, I recently implemented sqrt/1, exp/1, tan/1, etc.. for these number objects.

The numeric algorithms themselve use Maclaurin and Taylor series, plus appropriate range reductions to assure enough speed and breadth of the series.

Here is an example calculation, Ramanujan's Constant:

Jekejeke Prolog 2, Runtime Library 1.1.8
(c) 1985-2017, XLOG Technologies GmbH, Switzerland

?- use_module(library(stream/console)).
% 0 consults and 0 unloads in 0 ms.
Yes

?- X is mp(exp(pi*sqrt(163)), 60).
X = 0d262537412640768743.999999999999250072597198185688879353856320

The thingy was written in mixture of Prolog and Java. The speed and accuracy of it is still work in progress. The code is currently open source on GitHub.