photonic_crystal_period

计算多项流的好程序，简单好用，计算量小。可以较好的模拟二维的两项变化情况(Calculating a number of streams of the program, easy to use, small amount of calculation. Can better simulate the two-dimensional variation)

说明：  用C语言实现计算两个数字的最大公约数，代码简单简洁，适合初学者学习。(C language is used to calculate the maximum common divisor of two digits. The code is simple and concise. It is suitable for beginners to learn.)

说明：  算法设计第三版，算法设计第三版，算法设计第三版，算法设计第三版(Algorithm Design Third Edition)

说明：  非常好的地形改正程序，只需要有点位的经纬度，重力值和高程，内附例子和说明。(Program to compute terrain effects on gravimetric quantities.various modes of terrain effects may be computed)

数值分析里面的：不动点迭代法、牛顿迭代法、共轭梯度法和最速下降法(Conjugate Gradient)

给出一个求解连续混沌系统的最大Lyapunov指数的程序，经验证有很好的吻和度，并能应用的高维（超混沌）或其他混沌系统。(Solving a continuous chaotic system is given the maximum Lyapunov index procedure, proven good kiss and degrees, and can use the high-dimensional (super-chaotic), or other chaotic systems.)

一个个人使用的精简了的c++有限元计算库(Finite element calculation library)

说明：  基于OpenSEES平台的一个桥墩算例，可以供大家参考(An example of Bridge Pier Based on OPENSEES platform can be used for reference)

该程序是利用GIvens变换进行矩阵的QR分解(The program uses GIvens transform to solve QR matrix.)

判断城市电话区号是否合法的算法,对于理解算法有参考意义(Urban telephone area code to determine the legality of the algorithm, algorithm reference value for understanding the)