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 package org.apache.commons.math.distribution;
018
019 /**
020 * The Exponential Distribution.
021 *
022 * <p>
023 * References:
024 * <ul>
025 * <li><a href="http://mathworld.wolfram.com/ExponentialDistribution.html">
026 * Exponential Distribution</a></li>
027 * </ul>
028 * </p>
029 *
030 * @version $Revision: 920852 $ $Date: 2010-03-09 07:53:44 -0500 (Tue, 09 Mar 2010) $
031 */
032 public interface ExponentialDistribution extends ContinuousDistribution, HasDensity<Double> {
033 /**
034 * Modify the mean.
035 * @param mean the new mean.
036 * @deprecated as of v2.1
037 */
038 @Deprecated
039 void setMean(double mean);
040
041 /**
042 * Access the mean.
043 * @return the mean.
044 */
045 double getMean();
046
047 /**
048 * Return the probability density for a particular point.
049 * @param x The point at which the density should be computed.
050 * @return The pdf at point x.
051 */
052 double density(Double x);
053 }