x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
[AX,H1,H2] = plotyy(x,y1,x,y2,'plot');
%繪制數(shù)據(jù)圖形并返回坐標軸和圖形句柄
set(get(AX(1),'Ylabel'),'String','Left Y-axis')
%標注左邊的Y軸，在MATLAB圖形對象句柄這章里會講解set函數(shù)和get函數(shù)的用法
set(get(AX(2),'Ylabel'),'String','Right Y-axis')
%標注右邊的Y軸