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 /**
19 * Indicates type of integrator.
20 */
21 public enum IntegratorType {
22 /**
23 * Quadrature integrator. Suitable for general purpose integrations when no prior knowledge
24 * of the integrand is known or the function is not very smooth (i.e. linearly interpolated).
25 * Has slow convergence and might not converge at all if required accuracy is too stringent.
26 */
27 QUADRATURE,
28
29 /**
30 * Simpson integrator. Suitable when assumptions can be made about integrand smoothness.
31 * In general Simpson method will be more efficient (i.e. requires fewer function evaluations)
32 * when the function to be integrated has a finite fourth derivative (i.e. a continuous third
33 * derivative).
34 */
35 SIMPSON,
36
37 /**
38 * Romberg integrator. Suitable when integrand is sufficiently smooth (e.g. analytic), and
39 * integrated over intervals that contain no singularities, and where the endpoints are also
40 * non-singular. In such circumstances, Romberg method is more efficient than Simpson's one.
41 */
42 ROMBERG
43 }