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在农业生产和科研中经常要研究两个变量间的定量关系。两个变量间的定量关系主要包括线性关系和非线性关系，在实践中更多的是非线性关系。一元非线性回归问题要求事先确定回归方程的函数类型，但回归方程的函数类型常常是不容易判断的。一元非线性问题可以转换为寻找一条曲线
In agricultural production and research, it is often necessary to study the quantitative relationship between two variables. The quantitative relationship between two variables mainly includes linear relationship and non-linear relationship, and in practice, it is more nonlinear relationship. Unary nonlinear regression requires that the function type of the regression equation be determined in advance, but the function type of the regression equation is often not easy to judge. Unary nonlinear problems can be converted to finding a curve