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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: 1.8 $ $Date: 2004/06/23 16:26:15 $
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  }