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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 EulerFieldStepInterpolatorTest 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, FieldEquationsMapper<T> mapper) {
36          return new EulerFieldStepInterpolator<>(field, forward, yDotK,
37                                                   globalPreviousState, globalCurrentState,
38                                                   softPreviousState, softCurrentState,
39                                                   mapper);
40      }
41  
42      @Override
43      protected <T extends RealFieldElement<T>> FieldButcherArrayProvider<T>
44      createButcherArrayProvider(final Field<T> field) {
45          return new EulerFieldIntegrator<>(field, field.getOne());
46      }
47  
48      @Override
49      @Test
50      public void interpolationAtBounds() {
51          doInterpolationAtBounds(Decimal64Field.getInstance(), 1.0e-15);
52      }
53  
54      @Override
55      @Test
56      public void interpolationInside() {
57          doInterpolationInside(Decimal64Field.getInstance(), 3.3e-4, 7.9e-3);
58      }
59  
60      @Override
61      @Test
62      public void nonFieldInterpolatorConsistency() {
63          doNonFieldInterpolatorConsistency(Decimal64Field.getInstance(), 7.0e-18, 1.0e-50, 1.0e-50, 1.0e-50);
64      }
65  }