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1 /*
2  * Copyright 2003-2004 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 package org.apache.commons.math.special;
17
18 import org.apache.commons.math.MathException;
19 import org.apache.commons.math.TestUtils;
20
21 import junit.framework.TestCase;
22
23 /**
24  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
25  */
26 public class BetaTest extends TestCase {
27     /**
28      * Constructor for BetaTest.
29      * @param name
30      */
31     public BetaTest(String JavaDoc name) {
32         super(name);
33     }
34
35     private void testRegularizedBeta(double expected, double x, double a,
36         double b)
37     {
38         try {
39             double actual = Beta.regularizedBeta(x, a, b);
40             TestUtils.assertEquals(expected, actual, 10e-5);
41         } catch(MathException ex){
42             fail(ex.getMessage());
43         }
44     }
45
46     private void testLogBeta(double expected, double a, double b) {
47         double actual = Beta.logBeta(a, b);
48         TestUtils.assertEquals(expected, actual, 10e-5);
49     }
50
51     public void testRegularizedBetaNanPositivePositive() {
52         testRegularizedBeta(Double.NaN, Double.NaN, 1.0, 1.0);
53     }
54
55     public void testRegularizedBetaPositiveNanPositive() {
56         testRegularizedBeta(Double.NaN, 0.5, Double.NaN, 1.0);
57     }
58
59     public void testRegularizedBetaPositivePositiveNan() {
60         testRegularizedBeta(Double.NaN, 0.5, 1.0, Double.NaN);
61     }
62     
63     public void testRegularizedBetaNegativePositivePositive() {
64         testRegularizedBeta(Double.NaN, -0.5, 1.0, 2.0);
65     }
66     
67     public void testRegularizedBetaPositiveNegativePositive() {
68         testRegularizedBeta(Double.NaN, 0.5, -1.0, 2.0);
69     }
70     
71     public void testRegularizedBetaPositivePositiveNegative() {
72         testRegularizedBeta(Double.NaN, 0.5, 1.0, -2.0);
73     }
74     
75     public void testRegularizedBetaZeroPositivePositive() {
76         testRegularizedBeta(0.0, 0.0, 1.0, 2.0);
77     }
78     
79     public void testRegularizedBetaPositiveZeroPositive() {
80         testRegularizedBeta(Double.NaN, 0.5, 0.0, 2.0);
81     }
82     
83     public void testRegularizedBetaPositivePositiveZero() {
84         testRegularizedBeta(Double.NaN, 0.5, 1.0, 0.0);
85     }
86     
87     public void testRegularizedBetaPositivePositivePositive() {
88         testRegularizedBeta(0.75, 0.5, 1.0, 2.0);
89     }
90     
91     public void testLogBetaNanPositive() {
92         testLogBeta(Double.NaN, Double.NaN, 2.0);
93     }
94     
95     public void testLogBetaPositiveNan() {
96         testLogBeta(Double.NaN, 1.0, Double.NaN);
97     }
98     
99     public void testLogBetaNegativePositive() {
100         testLogBeta(Double.NaN, -1.0, 2.0);
101     }
102     
103     public void testLogBetaPositiveNegative() {
104         testLogBeta(Double.NaN, 1.0, -2.0);
105     }
106     
107     public void testLogBetaZeroPositive() {
108         testLogBeta(Double.NaN, 0.0, 2.0);
109     }
110     
111     public void testLogBetaPositiveZero() {
112         testLogBeta(Double.NaN, 1.0, 0.0);
113     }
114     
115     public void testLogBetaPositivePositive() {
116         testLogBeta(-0.693147, 1.0, 2.0);
117     }
118 }
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