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this small matlab code is used to design butter worth filter.

说明：  AWGN和瑞丽信道的仿真程序，很不错，希望对大家有帮助(simulation for AWGN and RayLey channel，hope it s helpful!)

This code shows you how to generate level set descriptions of various three dimensional interfaces.

Read text to be encrypted encrypt it and write to file encrypted.txt.Decryption done by readng encrypted.txt and plaintext written to decrypted.txt

一维含缺陷光子晶体带隙图,光子晶体由正常材料和不定介质组成。(One-dimensional photonic crystals with defects chart, photonic crystal materials and volatile media by the normal form.)

计算声音的旋律，利用了听觉模型和相关函数。(Calculation of the melody of the voice)

Set of files about subspace method and pca

关于matlab帮助命令的中文文档，很有用的(Matlab help command on the Chinese document, very useful)

这是图论里面的一个定理，即Havel定理，它是用来判断一系列的度的序列能否组成一个简单图，在这儿我实现了它。(This is the inside of a theorem of graph theory, that Havel theorem, which is used to determine whether a series of sequences degrees to form a simple graph, here I realized it.)

振动信号在进行处理之前，需要将信号进行一系列处理以便于进行数字分析(Before processing the vibration signal, the signal needs to be processed to a series of digital analysis of the)