01: /*
02: * Copyright 2003-2004 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: package org.apache.commons.math.distribution;
17:
18: /**
19: * The Gamma Distribution.
20: *
21: * Instances of GammaDistribution objects should be created using
22: * {@link DistributionFactory#createGammaDistribution(double,double)}.
23: *
24: * <p>
25: * References:
26: * <ul>
27: * <li><a href="http://mathworld.wolfram.com/GammaDistribution.html">
28: * Gamma Distribution</a></li>
29: * </ul>
30: * </p>
31: *
32: * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
33: */
34: public interface GammaDistribution extends ContinuousDistribution {
35: /**
36: * Modify the shape parameter, alpha.
37: * @param alpha the new shape parameter.
38: */
39: void setAlpha(double alpha);
40:
41: /**
42: * Access the shape parameter, alpha
43: * @return alpha.
44: */
45: double getAlpha();
46:
47: /**
48: * Modify the scale parameter, beta.
49: * @param beta the new scale parameter.
50: */
51: void setBeta(double beta);
52:
53: /**
54: * Access the scale parameter, beta
55: * @return beta.
56: */
57: double getBeta();
58: }
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