summation of products of matrices

2 次查看（过去 30 天）

显示更早的评论

Pasquale Valentini 2022-11-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1843388-summation-of-products-of-matrices

评论： Daniel Neubauer 2022-11-7

I would like so have a fast solution to this problem

where

is an p x m matrices and S is a symmetric matrices p x p, where m and p are very large

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Daniel Neubauer 2022-11-4

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1843388-summation-of-products-of-matrices#answer_1091213

编辑：Daniel Neubauer 2022-11-4

在 MATLAB Online 中打开

take a look at

Z = pagemtimes(X,Y)

is that what you need?

p=3;
m=4;
i=5;
E=ones(p,p,i);
A=rand(p,m,i);
Sum=sum(pagemtimes(pagemtimes(A,'C',E,'N'),A),3)
Sum = 4×4
   16.1794   14.6014   11.9153   11.5921
   14.6014   14.7036   11.2311   10.9738
   11.9153   11.2311    9.4835    8.7488
   11.5921   10.9738    8.7488    9.6928