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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  package org.apache.commons.math.distribution;
18  
19  /**
20   * The Exponential Distribution.
21   *
22   * <p>
23   * References:
24   * <ul>
25   * <li><a href="http://mathworld.wolfram.com/ExponentialDistribution.html">
26   * Exponential Distribution</a></li>
27   * </ul>
28   * </p>
29   *
30   * @version $Revision: 693598 $ $Date: 2008-09-09 16:37:08 -0400 (Tue, 09 Sep 2008) $
31   */
32  public interface ExponentialDistribution extends ContinuousDistribution, HasDensity<Double> {
33      /**
34       * Modify the mean.
35       * @param mean the new mean.
36       */
37      void setMean(double mean);
38      
39      /**
40       * Access the mean.
41       * @return the mean.
42       */
43      double getMean();
44  
45      /**
46       * Return the probability density for a particular point.
47       * @param x  The point at which the density should be computed.
48       * @return  The pdf at point x.
49       */
50      double density(Double x);
51  }