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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    *      http://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.apache.commons.math4.legacy.ode.nonstiff;
19  
20  
21  import org.apache.commons.math4.legacy.core.Field;
22  import org.apache.commons.math4.legacy.core.RealFieldElement;
23  import org.apache.commons.math4.legacy.ode.FieldEquationsMapper;
24  import org.apache.commons.math4.legacy.ode.FieldODEStateAndDerivative;
25  import org.junit.Test;
26  
27  public class ThreeEighthesFieldStepInterpolatorTest extends RungeKuttaFieldStepInterpolatorAbstractTest {
28  
29      @Override
30      protected <T extends RealFieldElement<T>> RungeKuttaFieldStepInterpolator<T>
31      createInterpolator(Field<T> field, boolean forward, T[][] yDotK,
32                         FieldODEStateAndDerivative<T> globalPreviousState,
33                         FieldODEStateAndDerivative<T> globalCurrentState,
34                         FieldODEStateAndDerivative<T> softPreviousState,
35                         FieldODEStateAndDerivative<T> softCurrentState,
36                         FieldEquationsMapper<T> mapper) {
37          return new ThreeEighthesFieldStepInterpolator<>(field, forward, yDotK,
38                                                           globalPreviousState, globalCurrentState,
39                                                           softPreviousState, softCurrentState,
40                                                           mapper);
41      }
42  
43      @Override
44      protected <T extends RealFieldElement<T>> FieldButcherArrayProvider<T>
45      createButcherArrayProvider(final Field<T> field) {
46          return new ThreeEighthesFieldIntegrator<>(field, field.getOne());
47      }
48  
49      @Override
50      @Test
51      public void interpolationAtBounds() {
52          doInterpolationAtBounds(Decimal64Field.getInstance(), 1.0e-15);
53      }
54  
55      @Override
56      @Test
57      public void interpolationInside() {
58          doInterpolationInside(Decimal64Field.getInstance(), 2.6e-7, 3.6e-6);
59      }
60  
61      @Override
62      @Test
63      public void nonFieldInterpolatorConsistency() {
64          doNonFieldInterpolatorConsistency(Decimal64Field.getInstance(), 1.4e-17, 1.2e-16, 3.4e-16, 1.4e-17);
65      }
66  }