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