从随机的数据中找出其规律性，给出其近似表达式的问题，在生产实践和科学实验中大量存在，通常利用数据的最小二乘法求得拟合曲线。-From random data to find its regularity, give its approximate expression problems in the production practice and scientific experiments abound, often use the data obtained by least squares

最小二乘曲线拟合 输入数据和阶数 输出函数系数-Least-squares curve fitting and order input data output function coefficients