total_length_of_cycle.m

this is a simple2-opt code

function total_length = total_length_of_cycle(distances,path)
total_length = 0;
for i = 1:length(path)-1
    total_length = total_length + distances(path(i),path(i+1));
end
total_length = total_length + distances(path(end),path(1));