It is necessary to solve a system of nonlinear equations for fitting the curve of nonlinear function by use of the least square method.
非线性函数的最小二乘法拟合曲线需要求解一个非线性方程组。
NLREG is a powerful statistical analysis program that performs linear and nonlinear regression analysis, surface and curve fitting.
NLREG是一款强大地统计分析软件。能够进行线性和非线性回归分析，表面和曲线拟和。
Making use of nonlinear curve fitting, distribution equation of bond stress of the fixed unit anchor length is achieved.
并对测试结果进行了拟合，得出了锚固段粘结应力分布的拟合方程。
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