summation of products of matrices

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Pasquale Valentini
Pasquale Valentini 2022-11-4
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

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Daniel Neubauer
Daniel Neubauer 2022-11-4
编辑：Daniel Neubauer 2022-11-4
Ran in:
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
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Pasquale Valentini
Pasquale Valentini 2022-11-4
thanks for your reply.
It is very useful, but it seems to me that using "pagemtimes" is not faster than using “For Loop Matlab"
Daniel Neubauer
Daniel Neubauer 2022-11-7
I dont know if there is a fasther way then, sorry!

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