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Java example source code file (FieldSecondaryEquations.java)

This example Java source code file (FieldSecondaryEquations.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

dimensionmismatchexception, fieldsecondaryequations, maxcountexceededexception, realfieldelement

The FieldSecondaryEquations.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.math3.ode;

import org.apache.commons.math3.RealFieldElement;
import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MaxCountExceededException;

/**
 * This interface allows users to add secondary differential equations to a primary
 * set of differential equations.
 * <p>
 * In some cases users may need to integrate some problem-specific equations along
 * with a primary set of differential equations. One example is optimal control where
 * adjoined parameters linked to the minimized Hamiltonian must be integrated.
 * </p>
 * <p>
 * This interface allows users to add such equations to a primary set of {@link
 * FirstOrderFieldDifferentialEquations first order differential equations}
 * thanks to the {@link FieldExpandableODE#addSecondaryEquations(FieldSecondaryEquations)}
 * method.
 * </p>
 * @see FirstOrderFieldDifferentialEquations
 * @see FieldExpandableODE
 * @param <T> the type of the field elements
 * @since 3.6
 */
public interface FieldSecondaryEquations<T extends RealFieldElement {

    /** Get the dimension of the secondary state parameters.
     * @return dimension of the secondary state parameters
     */
    int getDimension();

    /** Initialize equations at the start of an ODE integration.
     * <p>
     * This method is called once at the start of the integration. It
     * may be used by the equations to initialize some internal data
     * if needed.
     * </p>
     * @param t0 value of the independent <I>time variable at integration start
     * @param primary0 array containing the value of the primary state vector at integration start
     * @param secondary0 array containing the value of the secondary state vector at integration start
     * @param finalTime target time for the integration
     */
    void init(T t0, T[] primary0, T[] secondary0, T finalTime);

    /** Compute the derivatives related to the secondary state parameters.
     * @param t current value of the independent <I>time variable
     * @param primary array containing the current value of the primary state vector
     * @param primaryDot array containing the derivative of the primary state vector
     * @param secondary array containing the current value of the secondary state vector
     * @return derivative of the secondary state vector
     * @exception MaxCountExceededException if the number of functions evaluations is exceeded
     * @exception DimensionMismatchException if arrays dimensions do not match equations settings
     */
    T[] computeDerivatives(T t, T[] primary, T[] primaryDot, T[] secondary)
        throws MaxCountExceededException, DimensionMismatchException;

}

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