工程上经常需要对两个或多个非线性参量进行拟合，本压缩包里有各种使用拟合代码，很实用。-Projects often require two or more non-linear parameter fitting with the use of this compression bag fit a variety of code, and very practical.

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对数据进行椭圆拟合，得到椭圆参数，包括椭圆中心，半长轴，半短轴等参数(Ellipse fit the data to get the ellipse parameter)