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Help to create a loop

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Luciano Campos
Luciano Campos 2016-3-14
评论： Luciano Campos 2016-3-14
Hi everybody, Can anybody help me to write a loop that achieves the same result as this code?:
%
G(:,:,1)=kron(J*A'^0,Phi(:,:,1));
G(:,:,2)=kron(J*A'^1,Phi(:,:,1))+kron(J*A'^0,Phi(:,:,2));
G(:,:,3)=kron(J*A'^2,Phi(:,:,1))+kron(J*A'^1,Phi(:,:,2))+kron(J*A'^0,Phi(:,:,3));
G(:,:,4)=kron(J*A'^3,Phi(:,:,1))+kron(J*A'^2,Phi(:,:,2))+kron(J*A'^1,Phi(:,:,3))+kron(J*A'^0,Phi(:,:,4));
%
and so on, until G(:,:,9). Where
%
J=[eye(3) zeros(3)]
%
A =
-0.32 0.15 0.96 -0.16 0.15 0.93
0.04 -0.15 0.29 0.05 0.02 -0.01
-0.00 0.22 -0.26 0.03 0.35 -0.02
1 0 0 0 0 0
0 1 0 0 0 0
0 0 1 0 0 0
and Phi is in attached.
Thanks for your help
best,

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采纳的回答

Matthew Eicholtz
Matthew Eicholtz 2016-3-14
Here is one potential approach:
G = zeros(9,18,9); %seems to me to be the size you need to preallocate
for ii=1:9
for jj=ii-1:-1:0
G(:,:,ii) = G(:,:,ii) + kron(J*A'^jj, Phi(:,:,ii-jj));
end
end

更多回答（1 个）

Guillaume
Guillaume 2016-3-14
I don't see where the difficulty is:
for page = 1:9
gsum = [];
for iter = 1:page
gsum = gsum + kron(J*A'^(page-iter), Phi(:,:,iter));
end
G(:, :, page) = gsum;
end
There may be a way to vectorise the inner loop but I've not tried to understand what the code is doing.

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