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有限元Matlab程序，同时提供书籍的pdf文件，供同时学习使用(This book was written to be a undergraduate and introductory graduate level textbook, depending on whether the more advanced topics appearing in the end of each chapter are covered.)

在光通信系统中的低密度奇偶校验码的性能仿真中，利用该软件可以检测校验矩阵中是否含有4环和6环，并且可以检测出4环和6环出现次数最多的点。(Performance Simulation LDPC in an optical communication system, the use of the software can detect whether a check matrix containing 4 and 6 ring ring, and can detect the highest number of points 4 and 6 ring ring appears.)

该Matlab算法，可以实现振动数据的文件的读取，进而可以进行时频分析，得到信号特征值(The Matlab algorithm can achieve vibration data of the document read, in turn, can be time-frequency analysis, Signal Characteristics)

说明：  在通信系统中的BPSK调制和解调源代码，在现实中用处非常大(In the communication system in the BPSK modulation and demodulation source code, in reality, use very large)

信号功率谱分析。方法五、六，在此以详细编写。(Signal power spectral analysis. Methods 5, 6, in this case to the elaboration.)

与本人上次上传的类别一样，都是利用遗传算法求解TSP问题，本次采用的开发环境为 matlab！(From my previous categories, are the use of genetic algorithm to solve TSP problems, the development environment for the use of matlab!)

说明：  电力系统的牛顿-拉夫逊法潮流计算。 基本步骤： （1）形成节点导纳矩阵 （2）将各节点电压设初值U， （3）将节点初值代入相关求式，求出修正方程式的常数项向量 （4）将节点电压初值代入求式，求出雅可比矩阵元素 （5）求解修正方程，求修正向量 （6）求取节点电压的新值 （7）检查是否收敛，如不收敛，则以各节点电压的新值作为初值自第3步重新开始进行狭义次迭代，否则转入下一步 （8）计算支路功率分布，PV节点无功功率和平衡节点柱入功率。(Power system of Newton- rafer Johnson flow calculation method-matlab)

answer in 1 or 0 and of size(loadnum,centernum) function voltageregf = voltage_regulation_1(center,load,consdata)

This code calculate the steady seepage fo a concrete dam. The program is written in a manner that you can easily change the problem information. To understand how the program works, run main.m then follow the mentioned subroutines (.m files). There is enough comments in all .m files.

matlab中S函数的应用实例，求绝对值(matlab application examples of the S-function, absolute value)