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Java example source code file (FirstOrderDifferentialEquations.java)

This example Java source code file (FirstOrderDifferentialEquations.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.

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Java - Java tags/keywords

dimensionmismatchexception, firstorderdifferentialequations, maxcountexceededexception

The FirstOrderDifferentialEquations.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.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MaxCountExceededException;



/** This interface represents a first order differential equations set.
 *
 * <p>This interface should be implemented by all real first order
 * differential equation problems before they can be handled by the
 * integrators {@link FirstOrderIntegrator#integrate} method.</p>
 *
 * <p>A first order differential equations problem, as seen by an
 * integrator is the time derivative <code>dY/dt of a state
 * vector <code>Y, both being one dimensional arrays. From the
 * integrator point of view, this derivative depends only on the
 * current time <code>t and on the state vector
 * <code>Y.

* * <p>For real problems, the derivative depends also on parameters * that do not belong to the state vector (dynamical model constants * for example). These constants are completely outside of the scope * of this interface, the classes that implement it are allowed to * handle them as they want.</p> * * @see FirstOrderIntegrator * @see FirstOrderConverter * @see SecondOrderDifferentialEquations * * @since 1.2 */ public interface FirstOrderDifferentialEquations { /** Get the dimension of the problem. * @return dimension of the problem */ int getDimension(); /** Get the current time derivative of the state vector. * @param t current value of the independent <I>time variable * @param y array containing the current value of the state vector * @param yDot placeholder array where to put the time derivative of the state vector * @exception MaxCountExceededException if the number of functions evaluations is exceeded * @exception DimensionMismatchException if arrays dimensions do not match equations settings */ void computeDerivatives(double t, double[] y, double[] yDot) throws MaxCountExceededException, DimensionMismatchException; }

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