Check summation from n=0 to 5 |n><n| in MATLAB?

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D=5;
tmpI=eye(D);
ket0=tmpI(:,1); %|0>
ket1=tmpI(:,2); %|1>
ket2=tmpI(:,3); %|2>
ket3=tmpI(:,4); %|3>
ket4=tmpI(:,5); %|4>
ket5=tmpI(:,6); %|5>
% bra is the transpose of ket
bra0=tmpI(1,:); % <0|
bra1=tmpI(2,:); % <1|
bra2=tmpI(3,:); % <2|
bra3=tmpI(4,:); % <3|
bra4=tmpI(5,:); % <4|

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 11 Jan 2023
If |n><n| is the same as <n||n> then you should have a look at the help and documentation to dot. That function will not generalize well to the more general <n|G|n>. For that you might get away with the standard vector-matrix-vector products where you'll have to make some discrete version of the operator G. If |n><n| is not the same as <n||n> you might have to explain what it is supposed to be.
HTH

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