Computing Matrix in 4d is not Working

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Gözde Üstün
Gözde Üstün 2020-7-11
编辑： Gözde Üstün 2020-7-11
Hello,
I have these array:
A_ax(d,d,b,m)
B_by(d,d,b,m)
When I have A_ax(2,2,2,2)the code is working and I am getting the correct result:
d=size(A_ax,1);
m=size(A_ax,3);
P = zeros(d,d,m,m);
for x=1:m
for y=1:m
for a=1:d
for b=1:d
P(a,b,x,y) = real( trace(kron(A_ax(:,:,x,a),B_by(:,:,y,b))*rho));
end
end
end
end
However when I have that A_ax(4,4,2,2) code is not working. This is because a is going untill 4 but I dont have 4. I know the error but I could not find a correction for that:
How can I solve the problem?

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