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通过ifft变换，实现美国六级轨道谱的不平顺时间域信号模拟( the simulation of track irregularity based on the ifft transform )

说明：  蝙蝠算法求解最优化问题，本代码是用于求解目标函数(Bat algorithm solving objective function)

给定很多数据点之后找这些类的聚类中心，然后重新分类。(Given after a lot of data points to find these kind of cluster center, and then reclassified.)

直接序列扩频就是直接用具有高码率的扩频码序列在发端去扩展信号的频谱。而在收端，用相同的扩频码序列去进行解扩还原成原始的信息。(Direct Sequence Spread Spectrum is the direct use of the spreading code sequence with a high rate in the originator to expand the spectrum of the signal. Receiving end, using the same spreading code sequence to despread the broadening of the spread spectrum signal to restore the original information.)

matlab绘图及GUI，介绍采用matlab进行二维、三维绘图等等(matlab graphics and GUI, using matlab introduce two-dimensional, three-dimensional graphics, etc.)

9种不同的方法求解一维函数的极值，包括黄金分割法、插值法等。(Nine different ways to solve the extreme value of the one-dimensional functions, including the golden section method, interpolation.)

分步傅里叶算法是非线性薛定谔方程数值求解的一个非常快速的方法(Step Fourier method is a very fast method of numerical nonlinear Schrodinger equation)

说明：  数值分析-三样条差值函数计算给定点的值-三转角方法(Numerical Analysis- 3-spline function of calculating the difference of the value of a given point- 3 Corner Method)

采用平面波展开法模拟2维光子晶体的能带结构,FDTD法模拟2维光子晶体能量传输(used plane wave expansion method for simulation of two-dimensional photonic crystal structure of the band, FDTD simulation of two-dimensional photonic crystal energy transmission)

基于对蓄电池充电，并且能够实现逆变包含SVPWM模块，而且包含DC/DC模块。可实现整流逆变双向。(Based on the battery charge, and can achieve SVPWM inverter module contains, and includes DC/DC module. Enables bidirectional rectifier inverter.)