1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.math.distribution; 18 19 import org.apache.commons.math.MathException; 20 21 /** 22 * Computes the cumulative, inverse cumulative and density functions for the beta distribuiton. 23 * 24 * @see <a href="http://en.wikipedia.org/wiki/Beta_distribution">Beta_distribution</a> 25 * @version $Revision: 705239 $ $Date: 2008-10-16 09:32:32 -0400 (Thu, 16 Oct 2008) $ 26 * @since 2.0 27 */ 28 public interface BetaDistribution extends ContinuousDistribution, HasDensity<Double> { 29 /** 30 * Modify the shape parameter, alpha. 31 * @param alpha the new shape parameter. 32 */ 33 void setAlpha(double alpha); 34 35 /** 36 * Access the shape parameter, alpha 37 * @return alpha. 38 */ 39 double getAlpha(); 40 41 /** 42 * Modify the shape parameter, beta. 43 * @param beta the new scale parameter. 44 */ 45 void setBeta(double beta); 46 47 /** 48 * Access the shape parameter, beta 49 * @return beta. 50 */ 51 double getBeta(); 52 53 /** 54 * Return the probability density for a particular point. 55 * @param x The point at which the density should be computed. 56 * @return The pdf at point x. 57 * @exception MathException if probability density cannot be computed 58 */ 59 double density(Double x) throws MathException; 60 61 }