如何在Matlab绘制的图像坐标轴上加箭头?

如何在Matlab绘制的图像坐标轴上加箭头?x=[22.471 22.438 22.394 22.362 22.262 22.008 20.931 19.52 18.03 13.824 10.567 9.232 7.494 6.433 5.808 5.293 4.891 4.519 4.204 3.908 3.648 3.404 3.146 2.929 2.499 2.159];y=[0 10 20 30 50 75 100 125 150 200 250 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1750 2000];plot(x,y,'r.')p=polyfit(x,y,3);y1=p(1)*x.^3+p(2)*x.^2+p(3)*x+p(4);plot(x,y,'r.')hold onplot(x,y1,'-','LineWidth',2)set(gca,'Ydir','reverse')axis([0 25 0 2000])set(gca,'XAxisLocation','top')hold off这是我修改后的完善的程序,但是要如何在X,Y轴上加箭头呢?