test2.m

matlab 实用教程（ppt

%test2
clear;
x=(1:11);
y=[-.447 1.978 3.11 5.25 5.02 4.66 4.01 4.58 3.45 5.35 9.22];
p=polyfit(x,y,3);
xx=0:0.01:11;
yy=polyval(p,xx);
figure(2);plot(xx,yy,'-b',x,y,'or');