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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-417) improve performance of Percentile
Date Sun, 10 Oct 2010 14:51:34 GMT

     [ https://issues.apache.org/jira/browse/MATH-417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-417.
--------------------------------

    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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