MATLAB（矩阵实验室）是MATrix LABoratory的缩写，是一款由美国The MathWorks公司出品的商业数学软件。MATLAB是一种用于算法开发、数据可视化、数据分析以及数值计算的高级技术计算语言和交互式环境。除了矩阵运算、绘制函数/数据图像等常用功能外，MATLAB还可以用来创建用户界面及与调用其它语言（包括C，C++和FORTRAN）编写的程序。MATLAB基础知识；命令窗口是用户与MATLAB进行交互作业的主要场所，用户输入的MATLAB交互命令均在命令窗口执行。 感兴趣的朋友可以
The utilization of 2-dimensional arrays or matrices is extremely advantageous for severalapplications. Matrix rows and columns are used to hold numbers. We can define 2D在C++中使用多维数组来表示矩阵。在本文中，我们将看看如何实现use C++ to calculate the diagonal sum of a given square matrix.
The matrices have two diagonals, the main diagonal and the secondary diagonal (sometimesreferred to as major and minor diagonals). The major diagonal starts from the top-leftcorner (index [0, 0]) to the bottom-right corner (index [n-1, n-1]) where n is the order of the正方形矩阵。主对角线从右上角（索引[n-1, 0]）开始，到左下角corner (index [0, n-1]). Let us see the algorithm to find the sum of the elements along withthese two diagonals.
$$\begin{bmatrix}8 & 5& 3\newline6 & 7& 1\newline2 & 4& 9\\end{bmatrix},$$
In the previous example, one 3 x 3 matrix was used. We have scanned the diagonalsindividually and calculated the sum. Let us see the algorithm and implementation for a clearview.
In this article, we have seen how to calculate the diagonal sums of a given square matrix.主对角线从左上角延伸到右下角，而副对角线则从左下角延伸到右上角斜线从右上角开始到左下角。要找到这些的总和diagonal elements, we loop through all elements. When both row and column index values相同，它表示主对角线元素，当两个索引的和为与矩阵的阶数n-1相同，它将添加到副对角线上procedure takes two nested loops and we are traversing through all elements present in the2D数组。因此，计算两条对角线的和将花费O(n2)的时间给定的矩阵。
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