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https://issues.apache.org/jira/browse/MATH-417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-417.
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Resolution: Fixed
Fixed in subversion repository as of r1006299 for branch 2.x and as of r1006301
for trunk
> improve performance of Percentile
> ---------------------------------
>
> Key: MATH-417
> URL: https://issues.apache.org/jira/browse/MATH-417
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 2.1
> Reporter: Luc Maisonobe
> Fix For: 2.2
>
>
> The 2.1 implementation of Percentile sorts the sample array each time its
> evaluate method is called.
> When a lot of different percentiles are to be computed for the same sample,
> this unduces a lot of sorting work that could be avoided.
> When only one percentile is desired, a complete sort is also a waste of
> efforts as it runs in O(n ln(n)) when only a selection in O(n) would be
> sufficient.
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