Splitting up the distribution hierarchy
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Key: MATH-703
URL: https://issues.apache.org/jira/browse/MATH-703
Project: Commons Math
Issue Type: Improvement
Reporter: Christian Winter
Priority: Minor
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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