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    %功能：为图形添加图例
x=0:.01*pi:4*pi;
y1=2*sin(x);
y2=cos(x);
y3=sin(2*x).*cos(x);
plot(x,[y1;y2;y3])
axis([0 4*pi -2 2.5])
set(gca,'Xtick',[0 pi 2*pi],'Xticklabel',{'0','pi','2pi'})
legend('2*sin(x)','cos(x)','sin(2x)cos(x)')