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  
18  package org.apache.commons.math.distribution;
19  
20  /**
21   * Test cases for {@link ZipfDistribution}.
22   * Extends IntegerDistributionAbstractTest.  See class javadoc for
23   * IntegerDistributionAbstractTest for details.
24   * 
25   * @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $
26   */
27  public class ZipfDistributionTest extends IntegerDistributionAbstractTest {
28      public ZipfDistributionTest(String name) {
29          super(name);
30      }
31      
32      //-------------- Implementations for abstract methods -----------------------
33      
34      /** Creates the default discrete distribution instance to use in tests. */
35      @Override
36      public IntegerDistribution makeDistribution() {
37          return new ZipfDistributionImpl(10, 1);
38      }
39      
40      /** Creates the default probability density test input values */
41      @Override
42      public int[] makeDensityTestPoints() {
43          return new int[] {-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
44      }
45      
46      /** Creates the default probability density test expected values */
47      @Override
48      public double[] makeDensityTestValues() {
49          return new double[] {0d, 0d, 0.3414d, 0.1707d, 0.1138d, 0.0854d, 0.0683d, 
50                  0.0569d, 0.0488d, 0.0427d, 0.0379d, 0.0341d, 0d};
51      }
52      
53      /** Creates the default cumulative probability density test input values */
54      @Override
55      public int[] makeCumulativeTestPoints() {
56          return makeDensityTestPoints();
57      }
58      
59      /** Creates the default cumulative probability density test expected values */
60      @Override
61      public double[] makeCumulativeTestValues() {
62          return new double[] {0d, 0.0000d, 0.3414d, 0.5121d, 0.6259d, 0.7113d,
63                  0.7796d, 0.8365d, 0.8852d, 0.9279d, 0.9659d, 1d, 1d};
64          }
65      
66      /** Creates the default inverse cumulative probability test input values */
67      @Override
68      public double[] makeInverseCumulativeTestPoints() {
69          return new double[] {0, 0.001d, 0.010d, 0.025d, 0.050d, 0.3414d, 0.3415d, 0.999d,
70                  0.990d, 0.975d, 0.950d, 0.900d, 1}; 
71          }
72      
73      /** Creates the default inverse cumulative probability density test expected values */
74      @Override
75      public int[] makeInverseCumulativeTestValues() {
76          return new int[] {0, 0, 0, 0, 0, 0, 1, 9, 9, 9, 8, 7, 10};
77      }
78  }