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 }