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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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Sébastien Brisard commented on MATH-665:
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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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