各种插值：求已知数据点的拉格朗日插值多项式、艾特肯插值多项式、牛顿插值多项式 ......(Various interpolation: Lagrange interpolation polynomial for the known data points, Aitken interpolation polynomial and Newton interpolation polynomial ......)

分奇偶两种情况讨论的二次插值程序。当区间数为奇时，最后一个单独区间与倒数第二个区间一起插值。(The two interpolation procedure discussed in two cases of odd even numbers. When the interval number is odd, the last individual interval is interpolated with the last second intervals.)

Interpolation by PCHIP and Spline(This is show the Interpolation method by PCHIP and Spline)