matlab曲线拟合问题

输入：x=[0.25 0.5 1 1.5 2 3 4 6 8]

x =

0.2500    0.5000    1.0000    1.5000    2.0000    3.0000    4.0000    6.0000    8.0000

输入：y=[19.21 18.15 15.36 14.10 12.89 9.32 7.45 5.24 3.01]

y =

19.2100 18.1500 15.3600 14.1000 12.8900 9.3200 7.4500 5.2400 3.0100

拟合曲线p1输入：p1=polyfit(x,y,1)

p1 =

-2.0717 17.6791

输入：x1=0.25:0.01:8

略

输入：y1=polyval(p1,x1)

略

输入：plot(x,y,’o’,x1,y1)