BA_ScaleFree

使用matlab编写的时域有限差分法，pec边界的光子晶体。(Written using matlab finite difference time domain method, pec boundary of the photonic crystal.)

说明：  用二分法求解一元五次非线性方程的实数解，在高等电路学习中有很好的用途。(One yuan of five nonlinear equations dichotomy solving real solutions, there is a very good use in the higher circuit learning.)

FDTD中利用监视器电场提取S11，S21，S12，S22参数(In FDTD, S11, S21, S12, S22 parameters are extracted from the monitor electric field.)

基于Laguerre多项式的拟合程序，可以控制多项式的结束，以及变量alpha。(Based on Laguerre polynomial fitting procedure, you can control the end of polynomials, and variable alpha.)

说明：  最小二乘法拟合曲线的一个小程序，采用C++程序，(Least-squares fitting curve C++ program)

说明：  克里金方法（Kriging）, 是以南非矿业工程师D.G.Krige (克里金)名字命名的一项实用空间估计技术，是地质统计学 的重要组成部分，也是地质统计学的核心。 (Kriging method (Kriging), is a South African mining engineer DGKrige (Kerry King), named after a practical space estimation techniques, is an important part of geostatistics is the core of geostatistics.)

二维弹性力学边界元程序中调试中的问题，有助于初学者从中发现问题，学习编写程序(Plate of Elastic Static)

适用于Engine计算的经典PISO算法(the classic PISO algorithm for the Engine calculation )

一个非线性方程的matlap程序，杜芬方程的变异(A nonlinear equations matlap program, variation of Duffing equation)

说明：  三角网格以及矩形网格剖分. 实现等参单元以及误差L H 范数收敛阶估计.(Triangular meshes and rectangular meshes are subdivided to achieve convergence order estimation of error L H norm.)