中文说明：
以一种函数为例展示多种插值方法，包括分段线性插值、Newton插值、拉格朗日插值等等，并给出了函数文件及脚本文件。
English Description：
Take a function as an example to show a variety of interpolation methods, including piecewise linear interpolation, Newton interpolation, Lagrange interpolation and so on, and give the function file and script file.