

Java example source code file (EquationsMapper.java)
The EquationsMapper.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; import java.io.Serializable; import org.apache.commons.math3.exception.DimensionMismatchException; /** * Class mapping the part of a complete state or derivative that pertains * to a specific differential equation. * <p> * Instances of this class are guaranteed to be immutable. * </p> * @see SecondaryEquations * @since 3.0 */ public class EquationsMapper implements Serializable { /** Serializable UID. */ private static final long serialVersionUID = 20110925L; /** Index of the first equation element in complete state arrays. */ private final int firstIndex; /** Dimension of the secondary state parameters. */ private final int dimension; /** simple constructor. * @param firstIndex index of the first equation element in complete state arrays * @param dimension dimension of the secondary state parameters */ public EquationsMapper(final int firstIndex, final int dimension) { this.firstIndex = firstIndex; this.dimension = dimension; } /** Get the index of the first equation element in complete state arrays. * @return index of the first equation element in complete state arrays */ public int getFirstIndex() { return firstIndex; } /** Get the dimension of the secondary state parameters. * @return dimension of the secondary state parameters */ public int getDimension() { return dimension; } /** Extract equation data from a complete state or derivative array. * @param complete complete state or derivative array from which * equation data should be retrieved * @param equationData placeholder where to put equation data * @throws DimensionMismatchException if the dimension of the equation data does not * match the mapper dimension */ public void extractEquationData(double[] complete, double[] equationData) throws DimensionMismatchException { if (equationData.length != dimension) { throw new DimensionMismatchException(equationData.length, dimension); } System.arraycopy(complete, firstIndex, equationData, 0, dimension); } /** Insert equation data into a complete state or derivative array. * @param equationData equation data to be inserted into the complete array * @param complete placeholder where to put equation data (only the * part corresponding to the equation will be overwritten) * @throws DimensionMismatchException if the dimension of the equation data does not * match the mapper dimension */ public void insertEquationData(double[] equationData, double[] complete) throws DimensionMismatchException { if (equationData.length != dimension) { throw new DimensionMismatchException(equationData.length, dimension); } System.arraycopy(equationData, 0, complete, firstIndex, dimension); } } Other Java examples (source code examples)Here is a short list of links related to this Java EquationsMapper.java source code file: 
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