1：利用差分方法数值求解抛物方程，适当改编后，可以用于求解其他的抛物方程,2,： 利用符号运算计算lagrange插值基函数。-1: Using the method of differential numerical solution of parabolic equations, appropriately adapted, can be used to solve parabolic equation 2: the use of symbolic computation lagrange interpolation basis function.