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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2016/04/23 05:05:12 UTC

[jira] [Resolved] (MATH-473) Frequency: new option: NON-sorted

     [ https://issues.apache.org/jira/browse/MATH-473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-473.
-------------------------
    Resolution: Incomplete

No update in almost 4 years.

> Frequency: new option: NON-sorted
> ---------------------------------
>
>                 Key: MATH-473
>                 URL: https://issues.apache.org/jira/browse/MATH-473
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 1.0, 1.1, 1.2, 2.0, 2.1
>            Reporter: Dan Checkoway
>            Priority: Minor
>         Attachments: MATH-473.patch
>
>
> I have a request for enhancement on org.apache.commons.math.stat.Frequency.  I would like to be able to specify that the the backing map NOT be sorted.  Right now it uses TreeMap.  I would like to have the option of specifying that sorting is not important, and would in fact hinder performance, and a plain old HashMap should be used instead.
> i.e. constructor such as:
> public Frequency(boolean sorted);
> If sorted is true, use a TreeMap.  If sorted is false, use a HashMap.  Is this feasible?  I'd be happy to contribute a patch if that would help.



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