

Java example source code file (SecondOrderDifferentialEquations.java)
The SecondOrderDifferentialEquations.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/LICENSE2.0 * * 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; /** This interface represents a second order differential equations set. * <p>This interface should be implemented by all real second order * differential equation problems before they can be handled by the * integrators {@link SecondOrderIntegrator#integrate} method.</p> * * <p>A second order differential equations problem, as seen by an * integrator is the second time derivative <code>d2Y/dt^2 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, on the state vector * <code>Y and on the first time derivative of the state * vector.</p> * * <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 SecondOrderIntegrator * @see FirstOrderConverter * @see FirstOrderDifferentialEquations * @since 1.2 */ public interface SecondOrderDifferentialEquations { /** 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 array containing the current value of the first derivative * of the state vector * @param yDDot placeholder array where to put the second time derivative * of the state vector */ void computeSecondDerivatives(double t, double[] y, double[] yDot, double[] yDDot); } Other Java examples (source code examples)Here is a short list of links related to this Java SecondOrderDifferentialEquations.java source code file: 
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