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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 Wed, 09 Sep 2015 18:26:45 GMT

    [ https://issues.apache.org/jira/browse/MATH-1269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737356#comment-14737356
] 

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

I agree that the solution could be improved, as it artificially restricts the range of possible
values.

If the result of the calculation is NaN (and the input was not NaN) can't you just change
the NaN to Infinity?

> 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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