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Posted to issues@commons.apache.org by "Thomas Neidhart (JIRA)" <ji...@apache.org> on 2015/11/04 22:52:28 UTC

[jira] [Commented] (MATH-1269) FastMath.exp may return NaN for non-NaN arguments

    [ https://issues.apache.org/jira/browse/MATH-1269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990510#comment-14990510 ] 

Thomas Neidhart commented on MATH-1269:
---------------------------------------

your latest patch should be more performant for the same result, thus I would be in favor to apply it.

> 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-fix-tempC-infinity.patch, MATH-1269.patch, MATH-1269.patch, MATH-1269_fix_z.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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