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this document present how we use butterworth ,chybi1,chiby2 and recursif fiter using matlab

把结构动力学中的数值计算用matlab编程，方便大家使用（主要有Houbolt法、Duhamel法、WilsonTheta法等几种）(The structural dynamics of the numerical calculation with matlab programming to facilitate the use of (mainly Houbolt method, Duhamel method, WilsonTheta several law))

matlab教程，通过自己学课掌握主要的工能，希望对自学这有帮助(matlab tutorials, lessons learned through their own work to master the main hope for this self-help)

说明：  处理波形，计算声波再通过障碍物以后的延迟,从而计算声波在不同介质中的传播速度(Treatment of waveform, calculated the time delay after the sound waves pass through the obstaclesand，In order to estimate the acoustic propagation velocity in different media)

matlab源码产生跳频信号的m文件，非常好的(Matlab source of the signals generated hopping m document, very good Eastern)

利用构造函数法和线性回归算求一一维微观形貌的分形维数可直接使用。 (The constructor method and linear regression operator seeking the eleven-dimensional morphology of the fractal dimension can be used directly.)

说明：  Expectation-Maximization algorithm

you can plot the Array function of Smart Antenns

说明：  两自由度系统振动模型，初级学习模型，Simulink(Two-degree-of-freedom system vibration model, primary learning model, Simulink)

simple experiment on pid along with fuzzy comparision