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
23 package org.hipparchus.ode.nonstiff;
24
25 import org.hipparchus.CalculusFieldElement;
26
27 /** This interface represents an integrator based on Butcher arrays.
28 * @see RungeKuttaFieldIntegrator
29 * @see EmbeddedRungeKuttaFieldIntegrator
30 * @param <T> the type of the field elements
31 */
32
33 public interface FieldButcherArrayProvider<T extends CalculusFieldElement<T>> {
34
35 /** Get the time steps from Butcher array (without the first zero).
36 * @return time steps from Butcher array (without the first zero
37 */
38 T[] getC();
39
40 /** Get the internal weights from Butcher array (without the first empty row).
41 * @return internal weights from Butcher array (without the first empty row)
42 */
43 T[][] getA();
44
45 /** Get the external weights for the high order method from Butcher array.
46 * @return external weights for the high order method from Butcher array
47 */
48 T[] getB();
49
50 }