1 /*
2 * Copyright (C) 2023 Alberto Irurueta Carro (alberto@irurueta.com)
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package com.irurueta.numerical.integration;
17
18 import com.irurueta.numerical.SingleDimensionFunctionEvaluatorListener;
19
20 /**
21 * Computes function integration by using Romberg's method and Infinity mid-point quadrature.
22 * <p>
23 * If you need to integrate from a negative lower limit to positive infinity, you do this by
24 * breaking the integral into two pieces at some positive value:
25 * RombergInfinityMidPointQuadratureIntegrator integrator1 =
26 * new RombergInfinityMidPointQuadratureIntegrator(-5.0, 2.0, listener);
27 * RombergInfinityMidPointQuadratureIntegrator integrator2 =
28 * new RombergInfinityMidPointQuadratureIntegrator(2.0, 1e99, listener);
29 * double integral = integrator1.integrate() + integrator2.integrate();
30 */
31 public class RombergInfinityMidPointQuadratureIntegrator extends RombergIntegrator<InfinityMidPointQuadrature> {
32
33 /**
34 * Constructor.
35 *
36 * @param a Lower limit of integration.
37 * @param b Upper limit of integration.
38 * @param listener listener to evaluate a single dimension function at required points.
39 * @param eps required accuracy.
40 */
41 public RombergInfinityMidPointQuadratureIntegrator(
42 final double a, final double b, final SingleDimensionFunctionEvaluatorListener listener, final double eps) {
43 super(new InfinityMidPointQuadrature(a, b, listener), eps);
44 }
45
46 /**
47 * Constructor.
48 *
49 * @param a Lower limit of integration.
50 * @param b Upper limit of integration.
51 * @param listener listener to evaluate a single dimension function at required points.
52 */
53 public RombergInfinityMidPointQuadratureIntegrator(
54 final double a, final double b, final SingleDimensionFunctionEvaluatorListener listener) {
55 this(a, b, listener, EPS);
56 }
57
58 /**
59 * Gets type of quadrature.
60 *
61 * @return type of quadrature.
62 */
63 @Override
64 public QuadratureType getQuadratureType() {
65 return QuadratureType.INFINITY_MID_POINT;
66 }
67 }