exm043_6.m

《matlab教程》配套光盘

%exm043_6.m

%给定数据对
x0=0:0.1:1;
y0=[-.447,1.978,3.11,5.25,5.02,4.66,4.01,4.58,3.45,5.35,9.22];
%求拟合多项式系数
n=3;
P=polyfit(x0,y0,n)
%图示拟合情况
xx=0:0.01:1;
yy=polyval(P,xx);
plot(xx,yy,'-b',x0,y0,'.r','MarkerSize',20),xlabel('x')  
shg