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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    *      https://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  /*
19   * This is not the original file distributed by the Apache Software Foundation
20   * It has been modified by the Hipparchus project
21   */
22  package org.hipparchus.analysis.integration.gauss;
23  
24  import java.util.ArrayList;
25  import java.util.Collection;
26  
27  import org.hipparchus.util.Binary64;
28  import org.hipparchus.util.Binary64Field;
29  import org.junit.runner.RunWith;
30  import org.junit.runners.Parameterized;
31  import org.junit.runners.Parameterized.Parameters;
32  
33  /**
34   * Test of the {@link FieldLegendreRuleFactory}.
35   * This parameterized test extends the standard test for Gaussian quadrature
36   * rule, where each monomial is tested in turn.
37   * Parametrization allows to test automatically 0, 1, ... , {@link #MAX_NUM_POINTS}
38   * quadrature rules.
39   *
40   */
41  @RunWith(value=Parameterized.class)
42  public class FieldLegendreParametricTest extends FieldGaussianQuadratureAbstractTest {
43      private static final FieldGaussIntegratorFactory<Binary64> factory = new FieldGaussIntegratorFactory<>(Binary64Field.getInstance());
44  
45      /**
46       * The highest order quadrature rule to be tested.
47       */
48      public static final int MAX_NUM_POINTS = 30;
49  
50      /**
51       * Creates a new instance of this test, with the specified number of nodes
52       * for the Gauss-Legendre quadrature rule.
53       *
54       * @param numberOfPoints Order of integration rule.
55       * @param maxDegree Maximum degree of monomials to be tested.
56       * @param eps Value of &epsilon;.
57       * @param numUlps Value of the maximum relative error (in ulps).
58       */
59      public FieldLegendreParametricTest(int numberOfPoints,
60                                    int maxDegree,
61                                    double eps,
62                                    double numUlps) {
63          super(factory.legendre(numberOfPoints),
64                maxDegree, eps, numUlps);
65      }
66  
67      /**
68       * Returns the collection of parameters to be passed to the constructor of
69       * this class.
70       * Gauss-Legendre quadrature rules of order 1, ..., {@link #MAX_NUM_POINTS}
71       * will be constructed.
72       *
73       * @return the collection of parameters for this parameterized test.
74       */
75      @Parameters
76      public static Collection<Object[]> getParameters() {
77          final ArrayList<Object[]> parameters = new ArrayList<Object[]>();
78          for (int k = 1; k <= MAX_NUM_POINTS; k++) {
79              parameters.add(new Object[] { k, 2 * k - 1, Math.ulp(1d), 91d });
80          }
81          return parameters;
82      }
83  
84      @Override
85      public double getExpectedValue(final int n) {
86          if (n % 2 == 1) {
87              return 0;
88          }
89          return 2d / (n + 1);
90      }
91  }