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 }