Unable to perform assignment because the size of the left side is 4-by-4 and the size of the right side is 2-by-4.

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Gözde Üstün 2020-6-26

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评论： Gözde Üstün 2020-6-27

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Hello,

I am trying to create block diagonal if dimension d is greater than 2. However I have this error:

Unable to perform assignment because the size of the left side is 4-by-4 and the size of the right side is 2-by-4.

My code is here:

function [A,B] = CH2d(d)
    A=zeros(d,d,2,d);
    B=A;
    projectors_of_sigma_x = [1/sqrt(2)*[1;1],1/sqrt(2)*[1;-1]];
    for k = 1:d
        for l =1:d 
           if d > 2 
             A(:,:,1,k) = blkdiag(A(:,:,1,k));
          end   
           A(:,:,1,k)=repmat(projectors_of_sigma_x(:,k),1,d);
        end
    end
end