It is not a precision issue. R and commons-math use different algorithms with the same underlying numerical implementation.
It is even an open question which result is better. R has lots of credibility, but I have found cases where it lacked precision (and I coded up a patch that was accepted). Unbounded precision integers and rationals are very useful, but not usually for large scale numerical programming. Except in a very few cases, if you need more than 17 digits of precision, you have other very serious problems that precision won't help. On Fri, Feb 12, 2010 at 1:40 AM, Andy Turner <[email protected]>wrote: > Interesting that this is a precision issue. I'm not surprised depending on > what you are doing, double precision may not be enough. It depends a lot on > how the calculations are broken into smaller parts. BigDecimal is > fantastically useful... > -- Ted Dunning, CTO DeepDyve
