001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.distribution; 018 019 import org.apache.commons.math.MathException; 020 021 /** 022 * Computes the cumulative, inverse cumulative and density functions for the beta distribuiton. 023 * 024 * @see <a href="http://en.wikipedia.org/wiki/Beta_distribution">Beta_distribution</a> 025 * @version $Revision: 705239 $ $Date: 2008-10-16 09:32:32 -0400 (Thu, 16 Oct 2008) $ 026 * @since 2.0 027 */ 028 public interface BetaDistribution extends ContinuousDistribution, HasDensity<Double> { 029 /** 030 * Modify the shape parameter, alpha. 031 * @param alpha the new shape parameter. 032 */ 033 void setAlpha(double alpha); 034 035 /** 036 * Access the shape parameter, alpha 037 * @return alpha. 038 */ 039 double getAlpha(); 040 041 /** 042 * Modify the shape parameter, beta. 043 * @param beta the new scale parameter. 044 */ 045 void setBeta(double beta); 046 047 /** 048 * Access the shape parameter, beta 049 * @return beta. 050 */ 051 double getBeta(); 052 053 /** 054 * Return the probability density for a particular point. 055 * @param x The point at which the density should be computed. 056 * @return The pdf at point x. 057 * @exception MathException if probability density cannot be computed 058 */ 059 double density(Double x) throws MathException; 060 061 }