使用matlab中的逐元加法将值添加到矩阵的对角线(adding values to diagonals of matrix using element-wise addition in matlab)

 我正在编写一个在矩阵上运行的脚本，我遇到了需要将前一个矩阵的对角线总和与新矩阵的对角线元素相加的问题。 到目前为止，我对这个特定函数的代码（下面将更详细地描述）是： 
 
t = 1;
for k = (m-1):-1:-(m-1)
    C = bsxfun(@plus, diag(B, k), d);
    g(t) = sum(diag(B, k));
    t = t + 1;
end
 
 其中d是1x3阵列，C应该是3x3阵列; 然而，C被输出为1×3的阵列，使得第一个对角线被求和并加到d，然后主对角线被求和并加到d，并且最后的对角线被求和并加到d上。 
 
 有没有一种方法可以使C的值为：第一个对角线是它加入到d的最后一个元素的个别元素，d的中间元素的主对角线的各个元素以及底部对角线的元素添加到d的第一个元素？ （虽然仍然适用于任何阵列大小？） 
 
 这张图片描述了我想要达到的目标： 
 
 
 谢谢！ 

I am writing a script that operates on matrices, and I have run into the problem of needing to add the sum of the diagonals of a previous matrix to the diagonal elements of a new matrix. The code I have so far for this particular function (described in more detail below) is: 
 
t = 1;
for k = (m-1):-1:-(m-1)
    C = bsxfun(@plus, diag(B, k), d);
    g(t) = sum(diag(B, k));
    t = t + 1;
end
 
where d is a 1x3 array, and C is supposed to be a 3x3 array; however, C is being output as a 1x3 array in such a way that the first diagonal is being summed and added to d, then the main diagonal is being summed and added to d, and the final diagonal is being summed and added to d.
 
Is there a way I can get the values of C to be such that the first diagonal is the sum of it's individual elements added to the last element of d, the main diagonal's individual elements added to the middle element of d, and the bottom diagonal's elements added to the first element of d? (while still working for any array size?)
 
Here is a picture that describes what I'm trying to achieve:
 
 
Thanks!

原文：https://stackoverflow.com/questions/29000277