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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-370) NaN in "equals" methods
Date Fri, 07 May 2010 17:01:48 GMT

    [ https://issues.apache.org/jira/browse/MATH-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865236#action_12865236
] 

Gilles commented on MATH-370:
-----------------------------

The Javadocs for "Float" and "Double" also indicate the special behaviour for NaN in a number
object.  Nevertheless, the _primitive_ types are compliant with IEEE. Hence, there is an inconsistency
between the "equals" methods in "MathUtils" and the behaviour of the JVM.


> NaN in "equals" methods
> -----------------------
>
>                 Key: MATH-370
>                 URL: https://issues.apache.org/jira/browse/MATH-370
>             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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