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 */
17package 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: 920852 $ $Date: 2010-03-09 13:53:44 +0100 (mar. 09 mars 2010) $
31 */
32public interface ExponentialDistribution extends ContinuousDistribution, HasDensity<Double> {
33    /**
34     * Modify the mean.
35     * @param mean the new mean.
36     * @deprecated as of v2.1
37     */
38    @Deprecated
39    void setMean(double mean);
40
41    /**
42     * Access the mean.
43     * @return the mean.
44     */
45    double getMean();
46
47    /**
48     * Return the probability density for a particular point.
49     * @param x  The point at which the density should be computed.
50     * @return  The pdf at point x.
51     */
52    double density(Double x);
53}
54