Squre2

代码说明：

  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(for polynomial y (i) = b0 b1 b2* x* x* b3 ^ 2 x ^ 3 ...... bn* x ^ n recursive least squares method used to estimate the on-belts, b1, ..., bn)