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Posted to issues@commons.apache.org by "Thomas Neidhart (JIRA)" <ji...@apache.org> on 2012/07/22 17:02:34 UTC

[jira] [Resolved] (MATH-805) Percentile calculation is very slow when input data are constants

     [ https://issues.apache.org/jira/browse/MATH-805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Neidhart resolved MATH-805.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 3.1

Fixed in r1364318.
                
> Percentile calculation is very slow when input data are constants
> -----------------------------------------------------------------
>
>                 Key: MATH-805
>                 URL: https://issues.apache.org/jira/browse/MATH-805
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Benoit de Rancourt
>            Assignee: Thomas Neidhart
>            Priority: Minor
>              Labels: performance, test
>             Fix For: 3.1
>
>
> I use the Percentile class to calculate quantile on a big array (10^6 entries). When I have to test the performance of my code, I notice that the calculation of quantile is at least 100x slower when my data are constants (10^6 of the same nomber). Maybe the Percentile calculation can be improved for this special case.

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