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    }