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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-665) QRDecomposition does not have a singularity threshold
Date Thu, 08 Sep 2011 19:30:09 GMT

    [ https://issues.apache.org/jira/browse/MATH-665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100620#comment-13100620
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Luc Maisonobe commented on MATH-665:
------------------------------------

I guess MathUtils.SAFE_MIN would be an appropriate candidate. It was used in some LAPACK routines
(for SVD if I remember correctly).

> QRDecomposition does not have a singularity threshold
> -----------------------------------------------------
>
>                 Key: MATH-665
>                 URL: https://issues.apache.org/jira/browse/MATH-665
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Phil Steitz
>
> QRDecompositionImpl tests elements of rDiag for exact equality to 0 in checking singularity.
 A singularity threshold should be defined for this class and used in the singularity test.

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