1 | /*
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more
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3 | * contributor license agreements. See the NOTICE file distributed with
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4 | * this work for additional information regarding copyright ownership.
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0
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6 | * (the "License"); you may not use this file except in compliance with
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7 | * the License. You may obtain a copy of the License at
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8 | *
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9 | * http://www.apache.org/licenses/LICENSE-2.0
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10 | *
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11 | * Unless required by applicable law or agreed to in writing, software
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12 | * distributed under the License is distributed on an "AS IS" BASIS,
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 | * See the License for the specific language governing permissions and
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15 | * limitations under the License.
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16 | */
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17 |
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18 | package agents.anac.y2019.harddealer.math3.ode;
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19 |
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20 | import agents.anac.y2019.harddealer.math3.RealFieldElement;
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21 |
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22 | /** Container for time, main and secondary state vectors as well as their derivatives.
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23 |
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24 | * @see FirstOrderFieldDifferentialEquations
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25 | * @see FieldSecondaryEquations
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26 | * @see FirstOrderFieldIntegrator
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27 | * @param <T> the type of the field elements
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28 | * @since 3.6
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29 | */
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30 |
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31 | public class FieldODEStateAndDerivative<T extends RealFieldElement<T>> extends FieldODEState<T> {
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32 |
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33 | /** Derivative of the main state at time. */
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34 | private final T[] derivative;
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35 |
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36 | /** Derivative of the secondary state at time. */
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37 | private final T[][] secondaryDerivative;
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38 |
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39 | /** Simple constructor.
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40 | * <p>Calling this constructor is equivalent to call {@link
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41 | * #FieldODEStateAndDerivative(RealFieldElement, RealFieldElement[], RealFieldElement[],
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42 | * RealFieldElement[][], RealFieldElement[][]) FieldODEStateAndDerivative(time, state,
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43 | * derivative, null, null)}.</p>
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44 | * @param time time
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45 | * @param state state at time
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46 | * @param derivative derivative of the state at time
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47 | */
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48 | public FieldODEStateAndDerivative(T time, T[] state, T[] derivative) {
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49 | this(time, state, derivative, null, null);
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50 | }
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51 |
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52 | /** Simple constructor.
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53 | * @param time time
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54 | * @param state state at time
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55 | * @param derivative derivative of the state at time
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56 | * @param secondaryState state at time (may be null)
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57 | * @param secondaryDerivative derivative of the state at time (may be null)
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58 | */
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59 | public FieldODEStateAndDerivative(T time, T[] state, T[] derivative, T[][] secondaryState, T[][] secondaryDerivative) {
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60 | super(time, state, secondaryState);
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61 | this.derivative = derivative.clone();
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62 | this.secondaryDerivative = copy(time.getField(), secondaryDerivative);
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63 | }
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64 |
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65 | /** Get derivative of the main state at time.
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66 | * @return derivative of the main state at time
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67 | */
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68 | public T[] getDerivative() {
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69 | return derivative.clone();
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70 | }
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71 |
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72 | /** Get derivative of the secondary state at time.
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73 | * @param index index of the secondary set as returned
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74 | * by {@link FieldExpandableODE#addSecondaryEquations(FieldSecondaryEquations)}
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75 | * (beware index 0 corresponds to main state, additional states start at 1)
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76 | * @return derivative of the secondary state at time
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77 | */
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78 | public T[] getSecondaryDerivative(final int index) {
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79 | return index == 0 ? derivative.clone() : secondaryDerivative[index - 1].clone();
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80 | }
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81 |
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82 | }
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