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The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.
/*
* 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 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.
*
* Instances of this class are guaranteed to be immutable.
*
* @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);
}
}