%双横坐标绘制 x1 = [0:.1:40]; y1 = 4.*cos(x1)./(x1+2); x2 = [1:.2:20]; y2 = x2.^2./x2.^3; hl1 = line(x1,y1,Color,r); ax1 = gca; set(ax1,XColor,r,YColor,r) ax2 = axes(Position,get(ax1,Position),... XAxisLocation,top,... YAxisLocation,right,... Color,none,…