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 /** 20 * The Gamma Distribution. 21 * 22 * <p> 23 * References: 24 * <ul> 25 * <li><a href="http://mathworld.wolfram.com/GammaDistribution.html"> 26 * Gamma Distribution</a></li> 27 * </ul> 28 * </p> 29 * 30 * @version $Revision: 920852 $ $Date: 2010-03-09 13:53:44 +0100 (mar. 09 mars 2010) $ 31 */ 32 public interface GammaDistribution extends ContinuousDistribution, HasDensity<Double> { 33 /** 34 * Modify the shape parameter, alpha. 35 * @param alpha the new shape parameter. 36 * @deprecated as of v2.1 37 */ 38 @Deprecated 39 void setAlpha(double alpha); 40 41 /** 42 * Access the shape parameter, alpha 43 * @return alpha. 44 */ 45 double getAlpha(); 46 47 /** 48 * Modify the scale parameter, beta. 49 * @param beta the new scale parameter. 50 * @deprecated as of v2.1 51 */ 52 @Deprecated 53 void setBeta(double beta); 54 55 /** 56 * Access the scale parameter, beta 57 * @return beta. 58 */ 59 double getBeta(); 60 61 /** 62 * Return the probability density for a particular point. 63 * @param x The point at which the density should be computed. 64 * @return The pdf at point x. 65 */ 66 double density(Double x); 67 } 68
