%例15-5 多項(xiàng)式回歸
t = [0 .3 .8 1.1 1.6 2.3]'; 
y = [0.5 0.82 1.14 1.25 1.35 1.40]'; 	%產(chǎn)生已知數(shù)據(jù)
p=polyfit(t,y,2)
t2 = 0:.1:2.8; 
y2=polyval(p,t2);	%計(jì)算擬合函數(shù)在更多點(diǎn)上的值
plot(t,y,'o',t2,y2)		%畫出原來數(shù)據(jù)點(diǎn)和擬合曲線，如圖15-6