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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-317) Perf improvement: OpenMapRealVector should iterate over smaller of two OMRVs, and should call ArrayRealVector.getDataRef() when possible
Date Sun, 27 Dec 2009 20:12:29 GMT

     [ https://issues.apache.org/jira/browse/MATH-317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-317.
--------------------------------

    Resolution: Fixed

This was resolved in subversion repository as of r890159 by Bill Barker two weeks ago, using
a slightly modified version of the patch.
Thanks for the patch.

> Perf improvement: OpenMapRealVector should iterate over smaller of two OMRVs, and should
call ArrayRealVector.getDataRef() when possible
> ----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MATH-317
>                 URL: https://issues.apache.org/jira/browse/MATH-317
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.0
>         Environment: all
>            Reporter: Jake Mannix
>            Priority: Minor
>             Fix For: 2.1
>
>         Attachments: MATH-317.patch
>
>
> In RealVector methods which take other RealVector parameters, OpenMapRealVector should
check to see which vector has more entries, and iterate over the smaller of the two, when
possible.  When the other vector is an ArrayRealVector, it should be explicitly cast to this,
and getDataRef() should be called, to avoid an unnecessary and possibly large array copy.

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