x = linspace(0,pi);
y1 = cos(x);
plot(x,y1)

hold on
y2 = cos(2*x);
plot(x,y2)

y3 = cos(3*x);
plot(x,y3)

y4 = cos(4*x);
plot(x,y4)
hold off

legend({\'cos(x)\',\'cos(2x)\',\'cos(3x)\',\'cos(4x)\'},\'Location\',\'northwest\',\'NumColumns\',2,\'FontSize\',12,)

 如果不想显示某一个图例，可以参考以下代码：

figure(1);hold on;hi=plot([val_g,val_g],[0,g(val_g)],\'r-\',\'linewidth\',1);
set(hi(1),\'handlevisibility\',\'off\');

https://www.mathworks.com/help/matlab/ref/legend.html

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