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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1269) FastMath.exp may return NaN for non-NaN arguments
Date Thu, 10 Sep 2015 00:38:46 GMT

    [ https://issues.apache.org/jira/browse/MATH-1269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737891#comment-14737891
] 

Sebb commented on MATH-1269:
----------------------------

[Didn't you just choose a number above? ...]

But yes, one possible code fix is as you suggest, along with a unit test to show that the
number has been properly determined.

> FastMath.exp may return NaN for non-NaN arguments
> -------------------------------------------------
>
>                 Key: MATH-1269
>                 URL: https://issues.apache.org/jira/browse/MATH-1269
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Otmar Ertl
>         Attachments: MATH-1269.patch
>
>
> I have observed that FastMath.exp(709.8125) returns NaN. However, the exponential function
must never return NaN (if the argument is not NaN). The result must always be non-negative
or positive infinity.



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