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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-332) Replacement of the HasDensity<P>-interface with a "double density(double x)"-method on the AbstractContinuousDistribution
Date Wed, 17 Mar 2010 16:54:27 GMT

     [ https://issues.apache.org/jira/browse/MATH-332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz resolved MATH-332.
------------------------------

    Resolution: Fixed

Many thanks for the patch.  A slightly modified version has been committed in r924362.  In
addition to adding the missing density functions, this revision extends the continuous distribution
test framework to test density functions.  The HasDensity interface is deprecated, but not
removed.

> 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
>             Fix For: 2.1
>
>         Attachments: patch-all
>
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> 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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