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From "Mikkel Meyer Andersen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-332) Replacement of the HasDensity<P>-interface with a "double density(double x)"-method on the AbstractContinuousDistribution
Date Fri, 22 Jan 2010 21:46:21 GMT
Replacement of the HasDensity<P>-interface with a "double density(double x)"-method on
the AbstractContinuousDistribution
-------------------------------------------------------------------------------------------------------------------------

                 Key: MATH-332
                 URL: https://issues.apache.org/jira/browse/MATH-332
             Project: Commons Math
          Issue Type: Improvement
            Reporter: Mikkel Meyer Andersen
         Attachments: patch-all

Removed the HasDensity<P>-interface and replaced it with a "public double density(double
x)"-method on the AbstractContinuousDistribution-class (it throws an exception as default
if the classes don't override the method).

Implemented density-functions for the F-distribution, t-distribution, Weibull distribution,
and Cauchy distribution (the only continuous ones without a density implemented).

A side-effect is that ChiSquaredDistributionImpl now uses an internal GammaDistributionImpl
instead of a GammaDistribution. This is the only "major" change.

This improvement replaces https://issues.apache.org/jira/browse/MATH-330 (density implementation
for the F-distribution) and https://issues.apache.org/jira/browse/MATH-331 (density implementation
for the other three distributions).

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