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Java > Open Source Codes > org > apache > commons > math > distribution > NormalDistribution


1 /*
2  * Copyright 2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.apache.commons.math.distribution;
18
19 /**
20  * Normal (Gauss) Distribution.
21  * Instances of NormalDistribution objects should be created using
22  * {@link DistributionFactory#createNormalDistribution(double, double)}.<p>
23  *
24  * <p>
25  * References:<p>
26  * <ul>
27  * <li><a HREF="http://mathworld.wolfram.com/NormalDistribution.html">
28  * Normal Distribution</a></li>
29  * </ul>
30  * </p>
31  *
32  * @version $Revision$ $Date: 2005-06-26 15:20:57 -0700 (Sun, 26 Jun 2005) $
33  */
34 public interface NormalDistribution extends ContinuousDistribution {
35     /**
36      * Access the mean.
37      * @return mean for this distribution
38      */
39     double getMean();
40     /**
41      * Modify the mean.
42      * @param mean for this distribution
43      */
44     void setMean(double mean);
45     /**
46      * Access the standard deviation.
47      * @return standard deviation for this distribution
48      */
49     double getStandardDeviation();
50     /**
51      * Modify the standard deviation.
52      * @param sd standard deviation for this distribution
53      */
54     void setStandardDeviation(double sd);
55 }
56
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