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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  
18  package org.apache.commons.math.distribution;
19  
20  import org.apache.commons.math.MathException;
21  
22  /**
23   * Interface that signals that a distribution can compute the probability density function
24   * for a particular point.
25   * @param <P> the type of the point at which density is to be computed, this
26   * may be for example <code>Double</code>
27   * @version $Revision: 705239 $ $Date: 2008-10-16 09:32:32 -0400 (Thu, 16 Oct 2008) $
28   */
29  public interface HasDensity<P> {
30  
31      /**
32       * Compute the probability density function.
33       * @param x point for which the probability density is requested
34       * @return probability density at point x
35       * @throws MathException if probability density cannot be computed at specifed point
36       */
37      double density(P x) throws MathException;
38  
39  }