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https://issues.apache.org/jira/browse/MATH-1430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles updated MATH-1430:
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Attachment: MATH-1430.unit_test.diff
Unit tests (see attached patch) suggest that
* the default value of the threshold is dangerous (yielding garbage to an
unsuspecting user),
* the threshold is absolute whereas singularity is independent of the "global
scale".
> Singularity check in QRDecomposition
> ------------------------------------
>
> Key: MATH-1430
> URL: https://issues.apache.org/jira/browse/MATH-1430
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.6.1
> Reporter: Gilles
> Priority: Minor
> Fix For: 4.0
>
> Attachments: MATH-1430.unit_test.diff
>
>
> In class {{o.a.c.m.linear.QRDecomposition}}, the singularity check seems not
> to be robust enough to catch some (numerically) singular matrices.
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