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Commons Math example source code file (ThreeEighthesIntegrator.java)
The Commons Math ThreeEighthesIntegrator.java 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.math.ode.nonstiff; /** * This class implements the 3/8 fourth order Runge-Kutta * integrator for Ordinary Differential Equations. * * <p>This method is an explicit Runge-Kutta method, its Butcher-array * is the following one : * <pre> * 0 | 0 0 0 0 * 1/3 | 1/3 0 0 0 * 2/3 |-1/3 1 0 0 * 1 | 1 -1 1 0 * |-------------------- * | 1/8 3/8 3/8 1/8 * </pre> * </p> * * @see EulerIntegrator * @see ClassicalRungeKuttaIntegrator * @see GillIntegrator * @see MidpointIntegrator * @version $Revision: 810196 $ $Date: 2009-09-01 15:47:46 -0400 (Tue, 01 Sep 2009) $ * @since 1.2 */ public class ThreeEighthesIntegrator extends RungeKuttaIntegrator { /** Time steps Butcher array. */ private static final double[] STATIC_C = { 1.0 / 3.0, 2.0 / 3.0, 1.0 }; /** Internal weights Butcher array. */ private static final double[][] STATIC_A = { { 1.0 / 3.0 }, { -1.0 / 3.0, 1.0 }, { 1.0, -1.0, 1.0 } }; /** Propagation weights Butcher array. */ private static final double[] STATIC_B = { 1.0 / 8.0, 3.0 / 8.0, 3.0 / 8.0, 1.0 / 8.0 }; /** Simple constructor. * Build a 3/8 integrator with the given step. * @param step integration step */ public ThreeEighthesIntegrator(final double step) { super("3/8", STATIC_C, STATIC_A, STATIC_B, new ThreeEighthesStepInterpolator(), step); } } Other Commons Math examples (source code examples)Here is a short list of links related to this Commons Math ThreeEighthesIntegrator.java source code file: |
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