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里查得森(Richardson)法解偏微分方程的程序。解的是定步长的抛物型偏微分方程： du/dx - a * d2u/dx2 = 0 在程序中可以更改 a 的值以实现不同系数的解。由于它是一种显式格式，解的结果不稳定 在Matlab7下面运行发现竟然有一些值达到十的几十次方,这是算法本身决定的。不是程序有错误(Richard Anderson (Richardson) Solving partial differential equations procedures. Solution is scheduled to step parabolic partial differential equation: du/dx- a* d2u/dx2 = 0 in the procedure can be changed in order to realize the value of a different coefficient of the solution. Because it is an explicit format, the result of instability in the solution of the following Matlab7 running even found some value reached ten dozens of parties, this is the decision algorithm itself. Not a procedural error)

Hi ,it s a simple code

根据DFT的对称性，由原始序列计算所求的序列的DFT，用MATLAB 实现(According to the symmetry of the DFT, the DFT of the sequence of demand from the original sequence calculation with MATLAB)

使用IEEE33 BUS系統所求出來的匯流排電壓、相角、功率，是用前代回法求解電力潮流，希望對大家有幫助。(Seeking out the use the IEEE33 BUS system bus voltage, phase angle, power, with the previous generation back method for solving power flow, and I hope for all of us to help.)

A MATLAB code of noise level estimation in images

陆振波的SVM的MATLAB代码的解释，很详细的。(The bo of SVM MATLAB code explanation)

LDPC码既低密度奇偶校验码（Low Density Parity Check Code，LDPC），它由Robert G.Gallager博士于1963年提出的一类具有稀疏校验矩阵的线性分组码，不仅有逼近Shannon限的良好性能，而且译码复杂度较低, 结构灵活，是近年信道编码领域的研究热点，目前已广泛应用于深空通信、光纤通信、卫星数字视频和音频广播等领域。LDPC码已成为第四代通信系统(4G) (LDPC codes BER simulation under AWGN channel. MacKay-Neal based LDPC matrix. Message encoding uses sparse LU decomposition. There are 4 choices of decoder: hard-decision/bit-flip decoder, probability-domain SPA decoder, log-domain SPA decoder, and simplified log-domain SPA decoder.)

为图片进行添加高斯噪声均匀噪声以及椒盐噪声，并且采用a修正的均值滤波和自适应中值滤波进行除噪，并且进行除噪性能判断(Add a picture for uniform noise and Gaussian noise, salt and pepper noise, and the use of a modified mean filter and adaptive median filtering for noise removal, noise removal performance and to determine)

本程序是MATLAb 编程环境开发，可以进行基本的NMF分解，比传统的分解方法有更大改进(This program is MATLAb programming environment and development, can be the basic NMF decomposition, than the more traditional methods to improve the decomposition)

LZW text compresion with GUI..input the text compress it with LZW method