Usage: yi=akimai(x,y,xi) Given vectors x and y (of the same length) and the array xi at which to interpolate, fits piecewise cubic polynomials and returns the interpolated values yi at xi. Ref. : Hiroshi Akima, Journal of the ACM,

三次样条函数，可以直接运行，里面有数据，是一个函数功能。通过修改ex1,ex2的数据，实现你要的效果。-Three face upwards function, can be directly run, there are data, is a function function, through the modification ex1, ex2 value, achieve the effect of you want