Vectorise matrix element multiplication
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I want to find a way to vectorise the following operation:
- Take q random elements from the cell Z (which is populated by matrices)
- Multiply them together into a matrix
Here is how I am doing it right now:
combo_matrix = nchoosek(1:N,q);
H = zeros(2^(N/2));
for i = 1:combo
rand_index = randi(size(combo_matrix,1));
h = eye(2^(N/2));
for c = 1:q
h = h*Z{combo_matrix(rand_index,c)};
end
H = H + h;
combo_matrix(rand_index,:) = [];
end
H = complex(0,1)^(q/2) * H;
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KSSV
am 22 Jun. 2021
If Z is a matrix. You can replace the loop:
for c = 1:q
h = h*Z{combo_matrix(rand_index,c)};
end
with
c = 1:q ;
h = prod(Z(combo_matrix(rand_index,c)))
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