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1   /*
2    * Licensed to the Hipparchus project 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 Hipparchus project 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  package org.hipparchus.ode.nonstiff;
19  
20  /** This interface represents an integrator  based on Butcher arrays.
21   * @see RungeKuttaIntegrator
22   * @see EmbeddedRungeKuttaIntegrator
23   */
24  public interface ButcherArrayProvider {
25  
26      /** Get the time steps from Butcher array (without the first zero).
27       * @return time steps from Butcher array (without the first zero
28       */
29      double[] getC();
30  
31      /** Get the internal weights from Butcher array (without the first empty row).
32       * @return internal weights from Butcher array (without the first empty row)
33       */
34      double[][] getA();
35  
36      /** Get the external weights for the high order method from Butcher array.
37       * @return external weights for the high order method from Butcher array
38       */
39      double[] getB();
40  
41  }