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 */ 017 018 package org.apache.commons.math.distribution; 019 020 import org.apache.commons.math.MathException; 021 022 /** 023 * Interface that signals that a distribution can compute the probability density function 024 * for a particular point. 025 * @param <P> the type of the point at which density is to be computed, this 026 * may be for example <code>Double</code> 027 * @version $Revision: 705239 $ $Date: 2008-10-16 09:32:32 -0400 (Thu, 16 Oct 2008) $ 028 */ 029 public interface HasDensity<P> { 030 031 /** 032 * Compute the probability density function. 033 * @param x point for which the probability density is requested 034 * @return probability density at point x 035 * @throws MathException if probability density cannot be computed at specifed point 036 */ 037 double density(P x) throws MathException; 038 039 }