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 org.hipparchus.special.Gamma;
25 import org.hipparchus.util.Binary64;
26 import org.hipparchus.util.Binary64Field;
27 import org.hipparchus.util.FastMath;
28 import org.junit.jupiter.api.Test;
29
30 import static org.junit.jupiter.api.Assertions.assertEquals;
31
32 /**
33 * Test of the {@link FieldLaguerreRuleFactory}.
34 */
35 class FieldLaguerreTest {
36 private static final FieldGaussIntegratorFactory<Binary64> factory = new FieldGaussIntegratorFactory<>(Binary64Field.getInstance());
37
38 @Test
39 void testGamma() {
40 final double tol = 1e-13;
41
42 for (int i = 2; i < 10; i += 1) {
43 final double t = i;
44 final FieldGaussIntegrator<Binary64> integrator = factory.laguerre(7);
45 final double s = integrator.integrate(x -> FastMath.pow(x, t - 1)).getReal();
46 assertEquals(1d, Gamma.gamma(t) / s, tol);
47 }
48 }
49 }