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


1 /*
2  * Copyright 2005 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  * Weibull Distribution. This interface defines the two parameter form of the
21  * distribution as defined by
22  * <a HREF="http://mathworld.wolfram.com/WeibullDistribution.html">
23  * Weibull Distribution</a>, equations (1) and (2).
24  *
25  * Instances of WeibullDistribution objects should be created using
26  * {@link DistributionFactory#createWeibullDistribution(double, double)}
27  *
28  * <p>
29  * References:
30  * <ul>
31  * <li><a HREF="http://mathworld.wolfram.com/WeibullDistribution.html">
32  * Weibull Distribution</a></li>
33  * </ul>
34  * </p>
35  *
36  * @since 1.1
37  * @version $Revision: 1.12 $ $Date: 2004-06-23 11:26:18 -0500 (Wed, 23 Jun 2004) $
38  */
39 public interface WeibullDistribution extends ContinuousDistribution {
40
41     /**
42      * Access the shape parameter.
43      * @return the shape parameter.
44      */
45     double getShape();
46     
47     /**
48      * Access the scale parameter.
49      * @return the scale parameter.
50      */
51     double getScale();
52     
53     /**
54      * Modify the shape parameter.
55      * @param alpha The new shape parameter value.
56      */
57     void setShape(double alpha);
58     
59     /**
60      * Modify the scale parameter.
61      * @param beta The new scale parameter value.
62      */
63     void setScale(double beta);
64 }
65
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