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From Ted Dunning <>
Subject Re: Why not BigDecimal?
Date Fri, 12 Feb 2010 20:08:45 GMT
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 <>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

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