若一个三位自然数的各位数字的立方和等于该数本身，则称该自然数为水仙花数.此乃水仙花树的源程序-If one of you three-digit natural number and equal to the number of cubic itself, claimed that the number of natural numbers as daffodils. This is the source code tree daffodil

newton method , natural cubic spline, romberg

该程序实现了三次样条函数插值算法，并提供多种边界条件以供选择，包括自然三次样条与给定边界点导数值等。-The program implements a cubic spline function interpolation algorithm, and offers a variety of boundary conditions for selection, including natural cubic splines with a given boundary point derivati

数值分析中的自然三次样条插值程序，matlab版本-Numerical analysis of natural cubic spline interpolation procedure, matlab version