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dot product in 3d

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Mert Demir
Mert Demir 2022-2-7
评论： Mert Demir 2022-2-23
I am trying to convert 2d dot product below to 3d.
Nk=100
Ne=5
for i=1:Nk
for j=1:Ne
exp(i,j)=dot(Q(j,:),v_y(i,:))
where Q is 5*5 transition matrix and v_y is 100*5 matrix
Nk=100
Ne=5
Nz=3
for i=1:Nk
for j=1:Ne
for k=1:Nz
exp(i,j,k)??
end
end
end
where v_y is 100*5*3 matrix and Z will be a transition matrix 3*3
  2 个评论
VBBV
VBBV 2022-2-10
编辑：VBBV 2022-2-10
exp(i,j)
exp(i,j,k)
exp is a standard Matlab function. Using it as matrix is not recommended.
https://in.mathworks.com/help/matlab/ref/exp.html

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回答（1 个）

KSSV
KSSV 2022-2-7
Nk=100
Ne=5
Nz=3
for k = 1:Nz
for i=1:Nk
for j=1:Ne
exp(i,j,k) = dot(Q(j,:,k),v_y(i,:,k)) ;
end
end
  1 个评论
Mert Demir
Mert Demir 2022-2-7
Thank you but Q is 5*5 matrix and there is also a function Z 3*3 which should be multiply with the v_y as a dot product. Something like this
for k = 1:Nz
for i=1:Nk
for j=1:Ne
exp1(i,j,k) = dot(Q(j,:),v_y(i,:,k)) ;
exp2(i,j,k) = dot(Z(k,:),exp1(i,j,:)) ;
end
end

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