MATLAB: Simplifying the If statements.

Question

Hello Everyone, I am making this routing table for my network which is working fine but is there any efficient way of doing this, as i am running my simulation for 100000 iterations. In the following code, the variable idabs takes a value between 1 to 16 and depending on its value, the value of idcabs is generated accordingly.Thank you.

if any(idabs==[1:8])
    cabs_vector=[9,10,11,12];
    if idabs<=4
        idcabs=cabs_vector((idabs))
    else
        idcabs=cabs_vector((idabs-4))
    end
else
    cabs_vector=[13,14,15,16];
    if idabs<=12
        idcabs=cabs_vector((idabs-8))
    else
        idcabs=cabs_vector((idabs-12))
    end
end

Answer 1

cabs_vector = [9 10 11 12 9 10 11 12 13 14 15 16 13 14 15 16];
idcabs = cabs_vector(idabs);