求大神!给出数据x,y用一次,二次,三次,多项式及最小二乘原理拟合这些数据,并写出正规方程组x:-1.00-0.75-0.5-0.2500.250.50.751.00y:-0.22090.32950.88261.43922.00032.56453.13343.7061

Question

【求大神!】给出数据x,y 用一次,二次,三次,多项式及最小二乘原理拟合这些数据,并写出正规方程组
x: -1.00 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1.00
y:-0.2209 0.3295 0.8826 1.4392 2.0003 2.5645 3.1334 3.7061 4.2836
用MATLAB编写程序.

Answer 1

一次：y=2.01314 + 2.25165*x
二次：y=2.0001 +2.2516*x +0.0313*x*x
三次：y=2.0001 +2.2501*x +0.0313 *x*x + 0.00208*x*x*x