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https://issues.apache.org/jira/browse/MATH-1556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210471#comment-17210471
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Gilles Sadowski commented on MATH-1556:
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How does the development version behave?
> KolmogorovSmirnovTest broke between 3.5 and 3.6
> -----------------------------------------------
>
> Key: MATH-1556
> URL: https://issues.apache.org/jira/browse/MATH-1556
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6, 3.6.1
> Reporter: Christoph Läubrich
> Priority: Major
>
> I recently changed a dependency of an existing project from commons.math 3.5
> to commons math 3.6 and now getting the following exception:
> {code}Exception in thread "main"
> org.apache.commons.math3.exception.MathInternalError: illegal state: internal
> error, please fill a bug report at https://issues.apache.org/jira/browse/MATH
> at
> org.apache.commons.math3.stat.inference.KolmogorovSmirnovTest.fixTies(KolmogorovSmirnovTest.java:1171)
> at
> org.apache.commons.math3.stat.inference.KolmogorovSmirnovTest.kolmogorovSmirnovTest(KolmogorovSmirnovTest.java:263)
> {code}
> The following code works with 3.5 and fails with 3.6+
> {code}KolmogorovSmirnovTest smirnovTest = new KolmogorovSmirnovTest();
> double[] reference = {2.63880347458968E-4, 1.0,
> 2.638803474589694E-4};
> double[] sample = {0.2979181517268306, 1.0, 0.2979181517268308};
> double test = smirnovTest.kolmogorovSmirnovTest(reference,
> sample, false);
> System.out.println("test=" + test);{code}The data used here are
> just an example, I have tested several datasets of our application have many
> more where it fails so it does not seems to be special to the given input. I
> have shrieked the datasets as much as possible to reproduce the issue.
> If I use a simple example {code}double[] reference = {1, 1, 1};
> double[] sample = {0.9, 0.9, 0.9};{code} it works in both versions but I get
> slightly different results:
> 3.6.1 returns test=0.09999999999999998
> 3.5 returns test=0.1
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