rungekutta

这是单自由度的非线性微分方程的求解程序（分段函数），可以画出动响应图和相图。(Nonlinear differential equation)

EM算法，是一种无监督的聚类算法，可以实现对数据的处理，对不同数据进行聚类，生成类内相似度最大(EM algorithm is an unsupervised clustering algorithm, the data processing can be achieved on different data clustering, to generate the maximum within-class similarity)

本程序可计算主应力大小和方向。主应力就是两个垂直方向的作用力的合力所产生的力在单位截面上的力。(This program can calculate principal stress size and direction. Two vertical principal stress is the force by the force of the force in the direction of force on cross section in the unit.)

fft算法matlab实现，可直接运行，对比给定波形和经过fft后的波形效果(fft algorithm matlab realize, can be directly run, compared to a given waveform and waveform effects after fft)

说明：  ga-pls选取特征波长，能过有效减少建模所需要的波长。(Ga-pls can effectively reduce the wavelength required for modeling by selecting the characteristic wavelength)

对图像进行逐点计算，并且取最大值和最小值的差值作为该点新的灰度值。 在区别边缘点和非边缘点时，首先确定一个阈值T，若图像中像素点的新 值大于该门限值，则可以初步确定为边缘点，小于T的新值被判断为非边缘点.(Image point by point basis, and taking the maximum and minimum points of difference as the new gray value. Edge in the difference between point and non-edge point, first determine a threshold T, if the image of the new pixel value is greater than the threshold, you can initially identified as the edge point, the new value is less than T have been judged as non-edge point.)

In theory, this algorithm tends to provide good generalization performance at extremely fast learning speed.(The experimental results based on a few artificial and real benchmark function approximation and classification problems including very large complex applications show that the new algorithm can produce good generalization performance in most cases and can learn thousands of times faster than conventional popular learning algorithms for feedforward neural networks)

实现SPHIT编码，有n=5~2时的编码输出值！！(SPHIT coding show the output with n =5.....2)

matlab solve yusuan deng wenti (matlab solve yusuan deng wenti)

基于粒子群算法的PID控制器的设计与研究(Tuning of Digital PID Controller Using Particle Swarm Optimization)