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From "Phil Steitz (JIRA)" <>
Subject [jira] Commented: (MATH-370) NaN in "equals" methods
Date Mon, 10 May 2010 10:32:50 GMT


Phil Steitz commented on MATH-370:

I use the equals method and the array version in some of my  code that uses [math] (pretty
much the same basic use case as above) and I suspect it is possible that other users do as
well, so I would prefer to keep a renamed version of it available publicly, if consensus is
we need to rename it.  The fact that it is defined at all should be a flag to users that there
is something different going on, at least in the <double, double> case.  Note that the
<double, double, double> and <double, double, int> versions are also "different"
from the JDK; but there is no possibility for confusion of intent for them.

> NaN in "equals" methods
> -----------------------
>                 Key: MATH-370
>                 URL:
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Priority: Minor
> In "MathUtils", some "equals" methods will return true if both argument are NaN.
> Unless I'm mistaken, this contradicts the IEEE standard.
> If nobody objects, I'm going to make the changes.

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