| // 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.spaceroots.mantissa.linalg; |
| |
| /** This class represents matrices of the most general type. |
| |
| * <p>This class is the basic implementation of matrices to use when |
| * nothing special is known about the structure of the matrix.</p> |
| |
| * @version $Id$ |
| * @author L. Maisonobe |
| |
| */ |
| |
| public class GeneralMatrix |
| extends Matrix { |
| |
| /** Simple constructor. |
| * Build a matrix with null elements. |
| * @param rows number of rows of the matrix |
| * @param columns number of columns of the matrix |
| */ |
| public GeneralMatrix(int rows, int columns) { |
| super(rows, columns); |
| } |
| |
| /** Simple constructor. |
| * Build a matrix with specified elements. |
| * @param rows number of rows of the matrix |
| * @param columns number of columns of the matrix |
| * @param data table of the matrix elements (stored row after row) |
| */ |
| public GeneralMatrix(int rows, int columns, double[] data) { |
| super(rows, columns, data); |
| } |
| |
| /** Copy constructor. |
| * @param m matrix to copy |
| */ |
| public GeneralMatrix(Matrix m) { |
| super(m); |
| } |
| |
| public Matrix duplicate() { |
| return new GeneralMatrix(this); |
| } |
| |
| /** Add a matrix to the instance. |
| * This method adds a matrix to the instance. It does modify the instance. |
| * @param m matrix to add |
| * @exception IllegalArgumentException if there is a dimension mismatch |
| */ |
| public void selfAdd(Matrix m) { |
| |
| // validity check |
| if ((rows != m.rows) || (columns != m.columns)) { |
| throw new IllegalArgumentException("cannot add a " |
| + m.rows + 'x' + m.columns |
| + " matrix to a " |
| + rows + 'x' + columns |
| + " matrix"); |
| } |
| |
| // addition loop |
| for (int index = 0; index < rows * columns; ++index) { |
| data[index] += m.data[index]; |
| } |
| |
| } |
| |
| /** Substract a matrix from the instance. |
| * This method substracts a matrix from the instance. It does modify the instance. |
| * @param m matrix to substract |
| * @exception IllegalArgumentException if there is a dimension mismatch |
| */ |
| public void selfSub(Matrix m) { |
| |
| // validity check |
| if ((rows != m.rows) || (columns != m.columns)) { |
| throw new IllegalArgumentException("cannot substract a " |
| + m.rows + 'x' + m.columns |
| + " matrix from a " |
| + rows + 'x' + columns |
| + " matrix"); |
| } |
| |
| // substraction loop |
| for (int index = 0; index < rows * columns; ++index) { |
| data[index] -= m.data[index]; |
| } |
| |
| } |
| |
| protected NonNullRange getRangeForRow(int i) { |
| return new NonNullRange(0, columns); |
| } |
| |
| protected NonNullRange getRangeForColumn(int j) { |
| return new NonNullRange(0, rows); |
| } |
| |
| private static final long serialVersionUID = 4350328622456299819L; |
| |
| } |