ZFFT

粒子群优化算法(PSO)是一种进化计算技术(evolutionary computation)，有Eberhart博士和kennedy博士发明。源于对鸟群捕食的行为研究 PSO同遗传算法类似，是一种基于叠代的优化工具。系统初始化为一组随机解，通过叠代搜寻最优值。但是并没有遗传算法用的交叉(crossover)以及变异(mutation)。而是粒子在解空间追随最优的粒子进行搜索。详细的步骤以后的章节介绍 同遗传算法比较，PSO的优势在于简单容易实现并且没有许多参数需要调整。目前已广泛应用于函数优化，神经网络训练，模糊系统控制以及其他遗传算法的应用领域(Particle Swarm Optimization (PSO) is an evolutionary computation technique (evolutionary computation), has Dr. Eberhart and Dr. kennedy invention. Deriving from the behavior of birds of prey PSO with genetic algorithm is similar to an iterative optimization-based tools. System initialization for a group of random solutions, through the iterative search for optimal values. But there is no cross-genetic algorithm used (crossover) and mutation (mutation). But the particles in the solution space of the particles to follow the optimal search. In detail the steps after the introduction sections compared with the genetic algorithm, PSO has the advantage of being simple and easy and did not realize many of the parameters need to be adjusted. Has been widely applied to function optimization, neural network training, fuzzy system control, as well as other genetic algorithm applications)

通用最小二乘回归Matlab代码(General Least Squares Regression)(General least squares regression Matlab code (General Least Squares Regression))

根据已知的三维离散数据（x,y,z）,在MATLAB中利用此函数进行三维曲面拟合，再根据polyval2d得出拟合函数的系数矩阵。(according to 3D discrete datum (x,y,z),use this function in MATLAB to fit 3D surface, and use polyval2d to get coefficient matrix)

matlab实现块交织模块（CDMA系统交织模块）(matlab realize intertwined block module (CDMA systems are intertwined module))

psotrain is a matlab file to use so as as to get a look on the PSO training

加高斯噪声，椒盐噪声，复杂高斯噪声，复杂传统噪声(salt&pepper noise ；gaussian noise ；multiplicative gaussian；multiplicative uniform)

spread spectrum simulation

很详细的matlab实现FDTD功能的源代码(Very detailed matlab source code FDTD)

MatLab编写的均值滤波、中值滤波、高斯滤波 等图像处理函数(Written in MatLab mean filtering, median filtering, Gaussian filtering and other image processing functions)

说明：  搭建切换系统的模块，很有用的哦,在此基础上很容易搭建时滞系统的仿真模块哦，还可以提出宝贵的意见修改哦(it is very useful for you to simulation a switched system)