You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2012/07/23 00:53:35 UTC

[jira] [Commented] (MATH-630) Rank Revealing QR Decomposition missing

    [ 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira