calling a matrix with indexing

Dear all, I am not sure whether it is called inequality addition (for the sigma part) or anything, but I have to call the matrix to solve the equation. Here is the formula:

here is the variable: K=2; k=1:K; l=1:K, except l=k. for example:

Do you have any idea to generally write it in matlab? maybe using for or while function?

Thank you