使用牛顿—瑞费逊迭代法，可快捷地得到初始构形或当前构形上的节点坐标。
Using the Newton-Raphson iteration method, the node coordinates of elements on the reference configuration or the current configuration, can be obtained efficiently.
牛顿迭代法的精度较高，但计算量大也最复杂，且不能直接得到最接近参考圆的圆心位置坐标；
The precision of Newton iterative method is the better, but its calculating quantity is large and complex, moreover it can't get coordinate of center of the best fitting reference circle.
牛顿迭代法的精度较高，但计算量大也最复杂，且不能直接得到最接近参考圆的圆心位置坐标；
The precision of Newton iterative method is the better, but its calculating quantity is large and complex, moreover it can't get coordinate of center of the best fitting reference circle.
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