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说明：  matlabpart3。matlab学习相关资料，适合初学者(matlabpart3. matlab learning the relevant information, suitable for beginners)

IDEA cryptography document

先进pid控制算法及其matlab仿真程序。控制必备，非常实用。(Advanced PID control algorithm matlab simulation program. Control essential, very practical.)

三位梁单元的坐标转换，从单元的局部坐标转换为结构整体坐标(Three coordinate conversion beam element)

Otsu-最大类间方差Matlab代码 最大类间方差法原理：最大类间方差法是由日本学者大津于1979年提出的,是一种自适应的阈值确定的方法,又叫大津法,简称OTSU。它是按图像的灰度特性,将图像分成背景和目标2 部分。背景和目标之间的类间方差 ％ 大,说明构成图像的2 部分的差别越大,当部分目标错分为背景或部分背景错分为目标都会导致2 部 ％ 分差别变小。(Otsu- Otsu Matlab code Otsu Principle : Otsu law by Japanese scholars in the large-1979's, is an adaptive threshold established methodology, also known as big-law, referred to Otsu. It is based on image characteristics of the gray image can be divided into the background and objectives of Part 2. Background and objectives between the between-class variance%, which meant that the two images form part of the greater difference, When some background into the wrong target or part of the background into the wrong target will lead to sub-2% difference becomes smaller.)

matlab中信噪比计算程序，可以检验使用matlab内置函数添加的噪声是否正确(Can be tested using matlab citic noise ratio calculation, matlab built-in functions to add noise is correct )

采用遗传算法优化自抗扰控制器的参数，简化了调节参数的难度(Genetic algorithm was used ADRC parameters, simplifying the adjustment parameters of difficulty)

说明：  duffing混沌系统的分岔分析，含有详细程序(duffing bifurcation analysis of chaotic systems, containing detailed procedures)

说明：  基于matlab的turbo纠错码编码，包含多个调用函数(Matlab-error-correcting codes based on turbo coding, multiple call the function)

system identification(FIR)