[MATH-332] Replacement of the HasDensity<P>-interface with a "double density(double x)"-method on the AbstractContinuousDistribution

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1
• Assignee: Unassigned
• Reporter: Mikkel Meyer Andersen
• Created: 22/Jan/10 21:44
• Updated: 03/Apr/10 20:35
• Resolved: 17/Mar/10 16:54

Description

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).