中文说明：对于多项式y(i) = b0 + b1 * x + b2 * x^2 + b3 * x^3 + ...... bn * x^n用递推最小二乘法来估计上式中的b0， b1， ...， bn
English Description：
For the polynomial y (I) = B0 + B1 * x + B2 * x ^ 2 + B3 * x ^ 3 +... BN * x ^ n, the recursive least square method is used to estimate B0, B1,..., BN in the above formula