非线性实验数据曲线拟合的实践

Practice of Fitting Curve of Nonlinear Experimental Data

在曲线拟合实践中,提高拟合多项式的阶数,往往使多项式曲线在某些区间产生振荡,这就是多项式的摆动。本文介绍了非线性实验数据拟合高阶多项式摆动的概念,从实践的角度分析了产生这些摆动及偏差的因素和特点,总结了在实践中减小这些偏差的处理方法。

When fitting curve by high-order polynomial, in some interval the curve will surge sometimes. This is the surge of polynomial. In this article the concept of surge of fitting polynomial curve of nonlinear experimental data is introduced. By point of view of practice, the factor and chracteristic of the surge and windage are analysed.Based on the analysis ,methods to reduce the surge and windage for practise are educed.