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From: "Gilles Sadowski" <gil...@harfang.homelinux.org>
Sent: Thursday, May 06, 2010 5:09 AM
To: <dev@commons.apache.org>
Subject: [Math] NaN in "equals"
Hello.
In the "MathUtils" class, "equals" methods consider that a NaN is equal to
a
NaN. It seems that the orthodox view is that such a comparison should
return
"false".
Is there a rationale behind the current behaviour (e.g. it is admittedly
more efficient to not call "Double.isNaN")?
Or can I make the changes in order to comply to IEEE?
Well, that is the convention in most of the library, so would be -1 to
changing it only in MathUtils since it would then be inconsistent (e.g.
ArrayRealVector.equals returns "true" if both vectors have a NaN in some
(not necessarily the same) position. I would be -0.5 to changing it in a
point release, since there may be users that are relying on the current
behavior and point releases are supposed to be drop in replacements. I
don't have strong feelings either way for the next major release.
Best,
Gilles
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