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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Closed: (MATH-332) Replacement of the HasDensity<P>-interface with a "double density(double x)"-method on the AbstractContinuousDistribution
Date Sat, 03 Apr 2010 20:35:27 GMT

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

Phil Steitz closed MATH-332.
----------------------------


> 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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