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https://issues.apache.org/jira/browse/MATH-835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved MATH-835.
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Resolution: Fixed
Fix Version/s: 3.1
Fixed, as suggested, in revision 1367593.
Thanks for the report.
> Fraction percentageValue rare overflow
> --------------------------------------
>
> Key: MATH-835
> URL: https://issues.apache.org/jira/browse/MATH-835
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Baste Nesse Buanes
> Priority: Minor
> Labels: Fraction
> Fix For: 3.1
>
> Attachments: percentageValueOverflow.patch
>
>
> The percentageValue() method of the Fraction class works by first multiplying
> the Fraction by 100, then converting the Fraction to a double. This causes
> overflows when the numerator is greater than Integer.MAX_VALUE/100, even when
> the value of the fraction is far below this value.
> The patch changes the method to first convert to a double value, and then
> multiply this value by 100 - the result should be the same, but with less
> overflows. An addition to the test for the method that covers this bug is
> also included.
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