Generates a lagrangian funcion given the number of nodes

这是一个简单的拉格朗日曲线拟合和牛顿插值曲线拟合程序-This is a simple Lagrangian curve fitting and the Newton interpolation curve fitting procedure

通过上机实现拉格朗日、牛顿和三次自然样条三种插值算法，了解并掌握拉格朗日、牛顿和三次自然样条三种插值算法的内涵。通过动态演示曲线生成全过程，分析并比较三种插值算法的优缺点，深刻理解这些算法。-Lagrange, Newton-on and three natural spline the three interpolation algorithm, to understand and grasp the meaning of Lagrange, Newton, and three natural