01: /*
02: * Copyright 2005 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: }
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