How is modeled the more short time this loop?

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Erkan
Erkan 2021-8-28
评论： Erkan 2021-8-28
Hi everybody, i have the for loop, but loop time is very long. How can i make the more short time?
R=rand(1,3000);
W=zeros(1,length(R));
for i=1:length(R)+1
for ii=1:length(R)-i+1
W(i)=W(i)+R(ii)*R(ii+i-1)
end
end

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DGM
DGM 2021-8-28
编辑：DGM 2021-8-28
I bet this can be simplified further, but here.
l = 4;
R = rand(1,l);
W = zeros(1,l);
for k = 1:l
W(k) = sum(R(1:l-k+1) .* R(k:end));
end
EDIT: Updated to match question change. Also, echoing to console takes a considerable amount of time.
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Erkan
Erkan 2021-8-28
Yes, it is right working, thank you so much.

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