Java實(shí)現(xiàn)的矩陣乘法示例

​/*
 * 計(jì)算兩個矩陣相乘的方法
 */
public Matrix mutiply(Matrix m){
    Matrix result = new Matrix(this.getRows(), m.getCols());
    for (int i = 0 ; i < this.getRows() ; i++ ){
        for(int j = 0 ; j < m.getCols() ; j++ ){//正好為矩陣大小，保證了每個元素都被賦值
            for (int num = 0 ; num < this.getCols() ; num++){
                result.setData(i, j, this.getData(i, num) * m.getData(num, j));
            }
        }
    }
    return result;
}

public class MatrixTest {
    public static void main(String[] args) {
        //矩陣測試范例
        //僅為輸入?yún)⒖?無實(shí)際作用
        double [][]array01 = {
                {1, 2, 3},
                {4, 5, 6}
        };
        double [][]array02 = {
                {1, 4},
                {2, 5},
                {3, 6}
        };
        double [][] resultMatrix = new double[array01.length][array02[0].length];
        for (int i = 0 ; i < resultMatrix.length ; i++ ){
            for(int j = 0 ; j < resultMatrix[0].length ; j++ ){//正好為矩陣大小，保證了每個元素都被賦值
                for (int num = 0 ; num < array02.length ; num++){
                        resultMatrix[i][j] = resultMatrix[i][j] + array01[i][num]*array02[num][j];
                }
            }
        }
        
        for (int i = 0 ; i < resultMatrix.length ; i++ ){
            for(int j = 0 ; j < resultMatrix[0].length ; j++ ){//正好為矩陣大小，保證了每個元素都被賦值
                System.err.print(resultMatrix[i][j] + "\t");
            }
            System.out.println();
        }
    }
}