2、只显示部分曲线的legend
h1 = plot(data1);
plot(data2);
h2 = plot(data3);
legend([h1,h2],'string1','string2'); % only show the legend of data1 and data3
h1 = plot(data1);
plot(data2);
h2 = plot(data3);
legend([h1,h2],'string1','string2'); % only show the legend of data1 and data3