001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.math.distribution;
019    
020    /**
021     * Test cases for {@link ZipfDistribution}.
022     * Extends IntegerDistributionAbstractTest.  See class javadoc for
023     * IntegerDistributionAbstractTest for details.
024     * 
025     * @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $
026     */
027    public class ZipfDistributionTest extends IntegerDistributionAbstractTest {
028        public ZipfDistributionTest(String name) {
029            super(name);
030        }
031        
032        //-------------- Implementations for abstract methods -----------------------
033        
034        /** Creates the default discrete distribution instance to use in tests. */
035        @Override
036        public IntegerDistribution makeDistribution() {
037            return new ZipfDistributionImpl(10, 1);
038        }
039        
040        /** Creates the default probability density test input values */
041        @Override
042        public int[] makeDensityTestPoints() {
043            return new int[] {-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
044        }
045        
046        /** Creates the default probability density test expected values */
047        @Override
048        public double[] makeDensityTestValues() {
049            return new double[] {0d, 0d, 0.3414d, 0.1707d, 0.1138d, 0.0854d, 0.0683d, 
050                    0.0569d, 0.0488d, 0.0427d, 0.0379d, 0.0341d, 0d};
051        }
052        
053        /** Creates the default cumulative probability density test input values */
054        @Override
055        public int[] makeCumulativeTestPoints() {
056            return makeDensityTestPoints();
057        }
058        
059        /** Creates the default cumulative probability density test expected values */
060        @Override
061        public double[] makeCumulativeTestValues() {
062            return new double[] {0d, 0.0000d, 0.3414d, 0.5121d, 0.6259d, 0.7113d,
063                    0.7796d, 0.8365d, 0.8852d, 0.9279d, 0.9659d, 1d, 1d};
064            }
065        
066        /** Creates the default inverse cumulative probability test input values */
067        @Override
068        public double[] makeInverseCumulativeTestPoints() {
069            return new double[] {0, 0.001d, 0.010d, 0.025d, 0.050d, 0.3414d, 0.3415d, 0.999d,
070                    0.990d, 0.975d, 0.950d, 0.900d, 1}; 
071            }
072        
073        /** Creates the default inverse cumulative probability density test expected values */
074        @Override
075        public int[] makeInverseCumulativeTestValues() {
076            return new int[] {0, 0, 0, 0, 0, 0, 1, 9, 9, 9, 8, 7, 10};
077        }
078    }