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From S├ębastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Commented] (MATH-665) QRDecomposition does not have a singularity threshold
Date Thu, 08 Sep 2011 14:24:09 GMT

    [ https://issues.apache.org/jira/browse/MATH-665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100350#comment-13100350
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S├ębastien Brisard commented on MATH-665:
----------------------------------------

I've looked into NR and [SLATEC|http://www.netlib.org/slatec/lin/dqrsl.f]. In both cases a
similar test for strict equality is carried out. This is strange indeed; what would be a reasonable
threshold?

> 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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