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https://issues.apache.org/jira/browse/MATH-703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157961#comment-13157961
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Christian Winter commented on MATH-703:
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Thanks for the comments. I'm going to prepare a new patch based on them. I
appreciate removing the caching support for mean and variance (thanks for the
point with mutable distributions) as well as the method
{{toRealDistribution()}}. When preparing the first version of the patch, I just
wanted to retain the old code/functionality in some form in order to have a
discussion basis which doesn't drop anything tacitly.
I will move "Default" to its children as there are two votes for it. I don't
have a preference on another possibility (keeping "Default" or moving it to the
parents).
> Splitting up the distribution hierarchy
> ---------------------------------------
>
> Key: MATH-703
> URL: https://issues.apache.org/jira/browse/MATH-703
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 2.2
> Reporter: Christian Winter
> Priority: Minor
> Fix For: 3.0
>
> Attachments: MATH-703_patch.zip
>
>
> As discussed on the mailing list
> (http://apache-commons.680414.n4.nabble.com/math-Distributions-over-sample-spaces-other-than-R-tp3931349p3931349.html),
> the distribution interfaces should be restructured.
> The most important point is to create one root interface for each domain.
> There should *not* be a common super-interace because different domains
> require different functionality. Additionally, a super-inferface would
> require to parametrize the domain which makes things more complicated (e.g.,
> "double" would have to be replaced by "Double"). Currently, Commons Math
> supports distributions with real domain and distributions with integer
> domain. Thus there will be the interfaces RealDistribution and
> IntegerDistribution.
> Another point is to drop the special cases of distributions with real domain
> in order to simplify the structure. There won't be an interface for
> absolutely continuous distributions, and there won't be an interface for
> discrete distributions on the real domain. All the functionality required by
> the special cases can be defined in RealDistribution.
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