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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Closed: (MATH-317) Perf improvement: OpenMapRealVector should iterate over smaller of two OMRVs, and should call ArrayRealVector.getDataRef() when possible
Date Sat, 03 Apr 2010 20:51:29 GMT

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

Phil Steitz closed MATH-317.
----------------------------


> 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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