此实用程序函数返回一个数组副本，其中包含给定2D数组的传递行索引

//package com.nowjava;

/* 
 来自 
*N o w J a v a . c o m - 时代Java*/

public class Main {

    /**

     * This utility function returns an array copy containing of passed row

     * index of a given 2D array

     * 

     * @param twoDdoubleArray

     *            the original 2D double array from which a row will be copied

     *            and return as an array

     * @param row

     *            a row index indicating the row which needs to be taken out

     *            (copied and returned)

     * @return an array (double) containing a copy of its needed row (index

     *         passed as argument)

     */

    public static double[] rowCopy(double[][] twoDdoubleArray, int row) {

        double[] rowCopyArr = new double[twoDdoubleArray[0].length];

        for (