文本输入输出，实现数值计算的自然三次样条插值法-Text input and output, numerical calculation to achieve a natural cubic spline interpolation

关于半参数模型的补偿最小二乘法，利用三次自然样条函数构造正则化矩阵-About half the compensation method of least squares parameter model, the use of natural cubic spline function constructed regularization matrix