我们处理数据时，往往需要事先知道这些数据的规律（如线性），然后再进行相应阶数的最小二乘法拟合，本文试图在不知道拟合阶数的情况下通过程序计算拟合阶数。-We handle the data, the data often need to know in advance the rules (such as linear), and then make the appropriate order of the least squares fit, this article attempts to fit in I do not know the order in case the order through the program calculates the fitting .