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From Ted Dunning <>
Subject Re: [math] StatUtils handling of zero length arrays - MATH-373
Date Thu, 10 Jun 2010 04:29:01 GMT
I would count this as a bug fix rather than a compatibility break.  (my vote
is non-binding, of course)

On Wed, Jun 9, 2010 at 7:08 PM, Bill Barker <> wrote:

> Currently StatUtils.sum(double [])  (as well as most other statistics that
> operate on arrays) returns NaN on a zero length array.  As pointed out in
> the Jira issue, this is not the conventional treatment of a summation over
> the empty set (which would return zero) in the mathematical world.  I would
> definitely want to change this in 3.0.  But I'm on the fence for how much of
> an incompatible change this would be for 2.2.
> The change is simple, and I'm volunteering to do the work.  I just wanted
> to ping the list for opinions on how much breakage we can allow in 2.2.
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