c#的多项式类，包括多项式运算符重载,多项式求值，求根等，不错的参考类-c# polynominal class, including operator override，roots, polyval..

求解三次紧压样条曲线，其中给出了一阶导边界。并用polyval命令画出三次样条插值-The three-order compacted spline curve is solved, and the first order derivative boundary is given. And use the polyval command to draw cubic spline interpolation