example_polyfit.m

matlab从入门到精通第6章书后源码对初学者很有帮助

% example_polyfit.m
% 曲线拟合示例
x=0:0.1:1;
y=[-0.447 1.978 3.28 6.16 7.08 7.34 7.66 9.56 9.48 9.30 11.2];
% 曲线拟合
n=2;
p=polyfit(x,y,n);
% 根据拟合函数生成绘图数据
xi=linspace(0,1,100);
yi=polyval(p,xi);
plot(x,y,'-o',xi,yi,'--');
xlabel('x');ylabel('y=f(x)');
title('second order curve fitting')
legend('original','polyfit')