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实现了25种系统聚类的方法，在函数的选项里面可以进行方便的指定。同时可以自动计算这25种方法的评价函数，选择最优的系统聚类方法(25 kinds of systems to achieve a clustering method, in function of the option which can be easily specified. At the same time, it can automatically calculate the 25 kinds of methods of evaluation function, the system choose the best clustering method)

-给原始的语音信号加上一个高频余弦噪声，频率为5kHz。画出加噪后的语音信号时域和频谱图--(- To the original speech signal with a high-frequency cosine noise, frequency of 5kHz. Draw the speech signal with noise after the time-domain and frequency spectrum-)

Half wave rectifier simulation for beginner

说明：  对wav file 进行 waterfall fft处理(wav file waterfall FFT)

说明：  四种滤波器的设计，里面有详细的程序与图像，可以运行出来的(Four kinds of filter design, there is a detailed procedure and image, can run out of the filter )

detect object in simple and uniform background.

this code is for LMS Algorithm

Time-frequency representations with fixed windows or kernels figure prominently in many applications, but perform well only for limited classes of signals.

本代码是光子晶体光纤切面的光强分布仿真程序，对搞光子晶体的同行很有帮助。(the code is photonic crystal fiber plane, the intensity distribution simulation program to engage in peer photonic crystal helpful.)

中心极限定理的仿真，利用matlab实现，很好的例子啊(The Central Limit Theorem simulation using matlab to achieve a good example)