4-1.m

MATLAB科学计算与工程分析源代码源程序3

x=[0.1,0.2,0.15,0,-0.2,0.3];
y=[0.95,0.84,0.86,1.06,1.50,0.72];
p=polyfit(x,y,2)
xi=-0.2:0.01:0.3;
yi=polyval(p,xi)
plot(x,y,'o',xi,yi,'k')
title('polyfit');