nsga2.m

对多目标优化算法NSGA-II算法的改进

function nsga2()
    clc;
    POPSIZE = 10;
    GEN = 2;
    M = 2;
    V = 6;
    pop = initialize_variable(POPSIZE);
    pop = non_domination_sort_mod(pop,POPSIZE);
    for i = 1 : GEN
        pool = round(POPSIZE/2);
        tour = 2;
        parent_pop = tournament_selection(pop,pool,tour);
        pc = 0.9;
        pm = 0.1;
        muc = 20;
        mum = 20;
        child_pop = genetic_operator(parent_pop,pc,pm,muc,mum);
        [pop_popsize temp] = size(pop);
        [child_pop_popsize temp] = size(child_pop);
        combination_pop(1 : pop_popsize,:) = pop;
        combination_pop(pop_popsize + 1 : pop_popsize + child_pop_popsize,1 : M + V) = child_pop;
        combination_pop = non_domination_sort_mod(combination_pop,POPSIZE);
        pop = replacement(combination_pop,POPSIZE)
        if (~mod(i,10))
            fprintf('%d\n',i);
        end
    end
    save solution.txt pop -ASCII
    plot(pop(:,V + 1),pop(:,V + 2),'*');
    title('NSGA II');
    xlabel('f1(x)');
    ylabel('f2(x)');