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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: 201915 $ $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  }