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混合高斯分布的em算法，e步和m步，输出各参数值(mixture of gaussian,em)

J2000坐标系与WGS84坐标系之间的转换矩阵计算。(The matrix between J2000 and WGS84 coordinat system)

分数值分析的一些ppt课件，很有用，在学习C的时候，可以用到这些博大精深的思想(Fractional value analysis ppt courseware, useful when learning C, you can use these profound thought)

计算在不同湿度下，不同频率下，大气的衰减系数。(Calculation under different humidity, different frequencies, atmospheric attenuation coefficient.)

说明：  模拟退火算法是为了避免求解最优化出现局部极值的问题而提出的算法，保证最终的结果是全局最优的，该matlab源程序能在matlab环境中实现(simulated annealing method is the best solution in order to avoid a partial optimization of extreme concern raised by the algorithm to ensure that the final result is that the global optimum, the source Matlab can achieve Matlab environment)

电网络理论程序 matlab 半动态及动态节点编号优化 NODE为节点关系表 无错误，低警告(Electrical network theory the program matlab semi-dynamic and dynamic node numbering optimization the NODE node relational tables error-free, low-warning)

说明：  分数低阶协方差谱的MATLAB程序，含4种计算分数低阶协方差谱的估计方法(Fractional lower order covariance spectrum MATLAB program, including four kinds of calculation of fractional lower order covariance spectral estimation method)

fft 利用DSP Builder 在MATLAB下产生的模型(DSP Builder fft using the model generated in MATLAB)

一个abaqus梁单元的UEL，配套了理论和inp文件，可以完美运行(A abaqus UEL beam element, supporting the theory and inp file, you can run perfectly)

数据挖掘中，关联规则的例子，源码， arview算法的应用实例(data mining, association rules example, the source, the algorithm arview Application)