... phase') >> subplot(2,2 ,3) >> h3= plot(x,y3,'r-*','LineWidth',2,'MarkerSize',5); >> xlabel('Time') >> ylabel('Amplitude') >> legend(h3,'third') >> title('third phase') >> subplot % dua cua so ... title('First phase') >> subplot(2,2,2) >> h2=plot(x,y2,'g-+','LineWidth',2,'MarkerSize',5); >> xlabel('Time') >> ylabel('Amplitude') >> legend(h2,'second') >> title('Second phase') >> subplot(2,2 ,3) ...