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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.interpolators;
19  
20  import org.hipparchus.CalculusFieldElement;
21  import org.hipparchus.Field;
22  import org.hipparchus.ode.FieldEquationsMapper;
23  import org.hipparchus.ode.FieldODEStateAndDerivative;
24  import org.hipparchus.ode.nonstiff.EulerFieldIntegrator;
25  import org.hipparchus.ode.nonstiff.FieldButcherArrayProvider;
26  import org.hipparchus.util.Binary64Field;
27  import org.junit.jupiter.api.Test;
28  
29  class EulerFieldStateInterpolatorTest extends RungeKuttaFieldStateInterpolatorAbstractTest {
30  
31      protected <T extends CalculusFieldElement<T>> RungeKuttaFieldStateInterpolator<T>
32      createInterpolator(Field<T> field, boolean forward, T[][] yDotK,
33                         FieldODEStateAndDerivative<T> globalPreviousState,
34                         FieldODEStateAndDerivative<T> globalCurrentState,
35                         FieldODEStateAndDerivative<T> softPreviousState,
36                         FieldODEStateAndDerivative<T> softCurrentState, FieldEquationsMapper<T> mapper) {
37          return new EulerFieldStateInterpolator<T>(field, forward, yDotK,
38                                                    globalPreviousState, globalCurrentState,
39                                                    softPreviousState, softCurrentState,
40                                                    mapper);
41      }
42  
43      protected <T extends CalculusFieldElement<T>> FieldButcherArrayProvider<T>
44      createButcherArrayProvider(final Field<T> field) {
45          return new EulerFieldIntegrator<T>(field, field.getOne());
46      }
47  
48      @Test
49      public void interpolationAtBounds() {
50          doInterpolationAtBounds(Binary64Field.getInstance(), 1.0e-15);
51      }
52  
53      @Test
54      public void interpolationInside() {
55          doInterpolationInside(Binary64Field.getInstance(), 3.3e-4, 7.9e-3);
56      }
57  
58      @Test
59      public void nonFieldInterpolatorConsistency() {
60          doNonFieldInterpolatorConsistency(Binary64Field.getInstance(), 7.0e-18, 1.0e-50, 1.0e-50, 1.0e-50);
61      }
62  
63  }