1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math.distribution;
18
19 import org.apache.commons.math.MathException;
20
21 /**
22 * Computes the cumulative, inverse cumulative and density functions for the beta distribuiton.
23 *
24 * @see <a href="http://en.wikipedia.org/wiki/Beta_distribution">Beta_distribution</a>
25 * @version $Revision: 705239 $ $Date: 2008-10-16 09:32:32 -0400 (Thu, 16 Oct 2008) $
26 * @since 2.0
27 */
28 public interface BetaDistribution extends ContinuousDistribution, HasDensity<Double> {
29 /**
30 * Modify the shape parameter, alpha.
31 * @param alpha the new shape parameter.
32 */
33 void setAlpha(double alpha);
34
35 /**
36 * Access the shape parameter, alpha
37 * @return alpha.
38 */
39 double getAlpha();
40
41 /**
42 * Modify the shape parameter, beta.
43 * @param beta the new scale parameter.
44 */
45 void setBeta(double beta);
46
47 /**
48 * Access the shape parameter, beta
49 * @return beta.
50 */
51 double getBeta();
52
53 /**
54 * Return the probability density for a particular point.
55 * @param x The point at which the density should be computed.
56 * @return The pdf at point x.
57 * @exception MathException if probability density cannot be computed
58 */
59 double density(Double x) throws MathException;
60
61 }