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https://issues.apache.org/jira/browse/MATH-1096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889054#comment-13889054
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Luc Maisonobe commented on MATH-1096:
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Fixed in subversion repository as of r1563712.
> implementation of smallest enclosing ball algorithm sometime fails
> ------------------------------------------------------------------
>
> Key: MATH-1096
> URL: https://issues.apache.org/jira/browse/MATH-1096
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.3
> Reporter: Luc Maisonobe
> Assignee: Luc Maisonobe
> Priority: Blocker
>
> The algorithm for finding the smallest ball is designed in such a way the
> radius should be strictly increasing at each iteration.
> In some cases, it is not true and one iteration has a smaller ball. In most
> cases, there is no consequence, there is just one or two more iterations.
> However, in rare cases discovered while testing 3D, this generates an
> infinite loop.
> Some very short offending cases have already been identified and added to the
> test suite. These cases are currently deactivated in the main repository
> while I am already working on them. The test cases are
> * WelzlEncloser2DTest.testReducingBall
> * WelzlEncloser2DTest.testLargeSamples
> * WelzlEncloser3DTest.testInfiniteLoop
> * WelzlEncloser3DTest.testLargeSamples
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