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 matrix (multivariate) function integration by using an infinity mid-point quadrature.
22 * If you need to integrate from a negative lower limit to positive infinity, you do this by
23 * breaking the integral into two pieces at some positive value:
24 * InfinityMidPointQuadratureMatrixIntegrator integrator1 =
25 * new InfinityMidPointQuadratureMatrixIntegrator(-5.0, 2.0, listener);
26 * InfinityMidPointQuadratureMatrixIntegrator integrator2 =
27 * new InfinityMidPointQuadratureMatrixIntegrator(2.0, 1e99, listener);
28 * double integral = integrator1.integrate() + integrator2.integrate();
29 */
30 public class InfinityMidPointQuadratureMatrixIntegrator
31 extends QuadratureMatrixIntegrator<InfinityMidPointMatrixQuadrature> {
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 matrix (multivariate) function at
39 * required points.
40 * @param eps required accuracy.
41 * @throws WrongSizeException if size notified by provided listener is invalid.
42 */
43 public InfinityMidPointQuadratureMatrixIntegrator(
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 with default accuracy.
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 InfinityMidPointQuadratureMatrixIntegrator(
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 }