Need help in coding this summation, please.
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Hi,
Can anybody help me with coding this summation into matlab, please:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/157553/image.png)
where J is (3x6), A is (6x6) and Phi is (3x3x9).
I've tried with this code:
% for ii=1:hor
for mm=1:ii
G(:,:,ii)=sum(kron(J*A'^(ii-mm),Phi(:,:,mm)),3);
end
end %
but it doesn't seem to work, as I get incorrect results. I think the mistake is in the sum function, but I don't know other way of coding the summation (cumsum function doesn't work either).
I'd really appreciate some help here, as I'm completely stuck.
best,
3 个评论
Ced
2016-3-11
编辑:Ced
2016-3-11
I just found it strange to start G indexing a 1, but Phi indexing at 0.
Yeah, I messed up, sorry. Your original equation looks correct to me, but yes, you sum up too much. With sum, for each mm, you sum up over all of Phi again, which is not what you want.
Assuming you initialize G with zero:
for ii=1:hor
for mm=1:ii
G(:,:,ii) = G(:,:,ii) + kron(J*A'^(ii-mm),Phi(:,:,mm));
end
end
采纳的回答
Walter Roberson
2016-3-12
Is the x in a circle indicating cross-product or is it indicating exclusive or?
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