对于初学者具有参考意义，使用大量的有限元法求解偏微分方程，鲁棒性好，性能优越，计算多重分形非趋势波动分析，有详细的注释。- For beginners with a reference value, Using a large number of finite element method to solve partial differential equations, Robustness, superior performance, Calculate the multifractal tr