20130105

用c程序和matlab分别试验一种k-means改进算法，按照方法选取聚类中心点，事实证明，这种改进是有效的。(Matlab with c procedures and were experimenting with an improved k-means algorithm, in accordance with the method of selecting cluster center, the facts show that this improvement is effective.)

多变量灰色预测模型算法的Matlab实现，一个网络流量模型与算法(Multivariate prediction model gray Matlab implementation of the algorithm, a network traffic model and algorithm)

matlab写的单点定位程序，可以读取星历文件计算接收机坐标(Matlab write single point positioning program, can read the star calendar file calculation receiver coordinates)

Sub band adaptive filtering alogorhims

使用MATLAB对MIMO系统进行辨识，其中有各种算法仿真算例，N4SID，针对多变量系统的一种识别算法(MOESP (Multivariable Output-Error State sPace) is a deterministic method to identify linear time invariant systems. The MOESP method developed by M. Verhaegen and P. Dewilde is based on the LQ decomposition of Hankel matrix formed from input-output data, where L is lower triangular and Q is orthogonal. A Singular Value Decomposition (SVD) can be performed on a block from the L (L22) matrix to obtain the system order and the extended observability matrix. From this matrix it is possible to estimate the matrices C and A of state-space model. The final step is to solve overdetermined linear equations using the least-squares method to calculate matrices B and D.)

说明：  matlab R2012a 超级学习手册随书源代码(Matlab R2012a Super Learning Manual with Book Source Code)

pCA的ppt报告，PCA理论，该理论可用于降维处理，将高维数据变化 为低维数据。(ppt Report of the PCA, PCA theory, the theory can be used to deal with dimensionality reduction, high dimensional data will change for the low-dimensional data.)

涉及机械土木工程的常用刚架结构的计算，给出计算实例及matlab源程序，是提高工程设计方法的有效手段(Mechanical Engineering involves the calculation of a common frame structure, a numerical example and the matlab source code is to improve the engineering design method of an effective means of)

灰色预测模型的matlab源代码，灰色预测可以用在数据挖掘等方面(Grey prediction model matlab source code, gray prediction can be used in data mining, etc.)

该文件是模拟电磁波传播过程中遇到障碍物遮挡使信号与接收装置之间不能直视而产生的传输误差，对模拟电磁波传播具有很大帮助。(The file is a simulation of the transmission error caused by the obstacle occlusion in the process of electromagnetic wave propagation, which can not be seen directly between the signal and the receiving device. It is of great help to the simulation of electromagnetic wave propagation.)