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.algebra.WrongSizeException;
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 * RombergInfinityMidPointQuadratureMatrixIntegrator integrator1 =
26 * new RombergInfinityMidPointQuadratureMatrixIntegrator(-5.0, 2.0, listener);
27 * RombergInfinityMidPointQuadratureMatrixIntegrator integrator2 =
28 * new RombergInfinityMidPointQuadratureMatrixIntegrator(2.0, 1e99, listener);
29 * double integral = integrator1.integrate() + integrator2.integrate();
30 */
31 public class RombergInfinityMidPointQuadratureMatrixIntegrator
32 extends RombergMatrixIntegrator<InfinityMidPointMatrixQuadrature> {
33
34 /**
35 * Constructor.
36 *
37 * @param a Lower limit of integration.
38 * @param b Upper limit of integration.
39 * @param listener listener to evaluate a single dimension function at required points.
40 * @param eps required accuracy.
41 * @throws WrongSizeException if size notified by provided listener is invalid.
42 */
43 public RombergInfinityMidPointQuadratureMatrixIntegrator(
44 final double a, final double b, final MatrixSingleDimensionFunctionEvaluatorListener listener,
45 final double eps) throws WrongSizeException {
46 super(new InfinityMidPointMatrixQuadrature(a, b, listener), eps);
47 }
48
49 /**
50 * Constructor.
51 *
52 * @param a Lower limit of integration.
53 * @param b Upper limit of integration.
54 * @param listener listener to evaluate a single dimension function at required points.
55 * @throws WrongSizeException if size notified by provided listener is invalid.
56 */
57 public RombergInfinityMidPointQuadratureMatrixIntegrator(
58 final double a, final double b, final MatrixSingleDimensionFunctionEvaluatorListener listener)
59 throws WrongSizeException {
60 this(a, b, listener, EPS);
61 }
62
63 /**
64 * Gets type of quadrature.
65 *
66 * @return type of quadrature.
67 */
68 @Override
69 public QuadratureType getQuadratureType() {
70 return QuadratureType.INFINITY_MID_POINT;
71 }
72 }