plot(t1,U1_A,'-r','linewidth',1.0);
hold on;
plot(t2,U1_S,'o','markerfacecolor','w','linewidth',0.5);
hold on;
plot(t1,U6_A,'-r','linewidth',1.0);
hold on;
plot(t2,U6_S,'o','markerfacecolor','w','linewidth',0.5);
hold on;
plot(t1,U10_A,'-r','linewidth',1.0);
hold on;
plot(t2,U10_S,'o','markerfacecolor','w','linewidth',0.5);
legend('解析解','模拟值');
legend('boxoff');legend(gca,'Orientation','horizontal');
legend boxoff;
上面是我的代码,我画了三条线,然后与这三线线相对应的点。这些线代表的是解析值,点代表是模拟值。我只想显示出一个图例,可是上面的代码会显示这六个数据系列的图例,如下图所示。请问该如何设置呀?