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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COLLECTIONS-479) An Order Statistic Tree
Date Thu, 01 Jan 2015 21:18:14 GMT

     [ https://issues.apache.org/jira/browse/COLLECTIONS-479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Neidhart updated COLLECTIONS-479:
----------------------------------------
    Fix Version/s: 4.x

> An Order Statistic Tree
> -----------------------
>
>                 Key: COLLECTIONS-479
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-479
>             Project: Commons Collections
>          Issue Type: New Feature
>            Reporter: Ajo Fod
>            Priority: Minor
>             Fix For: 4.x
>
>         Attachments: COLLECTIONS-479.patch, NodeExistsException.java, RedBlackBST.java
>
>
> An order statistic tree http://en.wikipedia.org/wiki/Order_statistic_tree provides two
useful properties. The ability to rank arbitrary keys relative to keys existing in the tree
AND the ability to retrieve elements from the tree with the given rank.
> This can be used to find the percentile rank of a key for example.
> This functionality is not yet provided yet by any of the major libraries AFAIK.



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