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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-630) Rank Revealing QR Decomposition missing
Date Sun, 22 Jul 2012 22:53:35 GMT

    [ https://issues.apache.org/jira/browse/MATH-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420357#comment-13420357
] 

Gilles commented on MATH-630:
-----------------------------

No further patch have been submitted.
Is this issue still current?

                
> Rank Revealing QR Decomposition missing
> ---------------------------------------
>
>                 Key: MATH-630
>                 URL: https://issues.apache.org/jira/browse/MATH-630
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.0, 2.1, 2.2
>            Reporter: Christopher Nix
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: QRDecomposition.patch, RRQRDecomposition.patch
>
>
> The current QR decomposition implementation performs no column pivoting and is thus not
rank revealing.
> A rank revealing QR decomposition could determine rank more efficiently, though not always
as reliably, as from the Singular Value Decomposition.  Additionally the rank revealing decomposition
can be used in least-squares algorithms on rank-deficient matrices.

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