write matlab code for this expression

Answer 1

[Walter Roberson]

appears to be a set of functions. You will need to use a cell array of function handles and index it like

tau{i,j}(t)

You will need a loop similar to

denom = 0;
for m = reshape(unique(U_k), 1, [])
    denom = denom + t{i,m}(t).^alpha .* eta(i,m).^beta;
end

[Lohith]

Thank you