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 /** 21 * Base interface for discrete distributions. 22 * 23 * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $ 24 */ 25 public interface DiscreteDistribution extends Distribution { 26 /** 27 * For a random variable X whose values are distributed according 28 * to this distribution, this method returns P(X = x). In other words, this 29 * method represents the probability mass function, or PMF for the distribution. 30 * 31 * @param x the value at which the probability mass function is evaluated. 32 * @return the value of the probability mass function at x 33 */ 34 double probability(double x); 35 } 36
