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 ε.
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 }