[ https://issues.apache.org/jira/browse/MATH-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phil Steitz reopened MATH-1203: ------------------------------- Thanks for reviewing, Thomas. I did think about checking variance = 0 instead and probably should have done that. In fact, since it is possible that a non-constant user-supplied kernel can have no support in a bin, the 0/0 computation that led to this bug could happen even without variance == 0. So I guess a more robust test is first check if the distribution is variance is 0, then check kB > 0. Thanks again for reviewing. > getKernel fails for buckets with only multiple instances of the same value in > random.EmpiricalDistribution > ---------------------------------------------------------------------------------------------------------- > > Key: MATH-1203 > URL: https://issues.apache.org/jira/browse/MATH-1203 > Project: Commons Math > Issue Type: Bug > Affects Versions: 3.4, 3.4.1 > Reporter: Kyle Kavanagh > > After loading a set of values into an EmpericalDistribution, assume that > there's a case where a single bin ONLY contains multiple instances of the > same value. In this case the standard deviation will equal zero. This will > fail when getKernel attempts to create a NormalDistribution. The other case > where stddev=0 is when there is only a single value in the bin, and this is > handled by returning a ConstantRealDistribution rather than a > NormalDistrbution. > See: https://issues.apache.org/jira/browse/MATH-984 -- This message was sent by Atlassian JIRA (v6.3.4#6332)