HUIDU

A tutorial on Principal Components Analysis.

electric field in bessel cylinder wave

说明：  第2章 Simulink使用基础.ppt 第3章 动态系统模型及其Simulink表示.ppt(Chapter 2 the basis of Simulink use. Ppt Chapter 3 dynamic system model and its Simulink said. Ppt)

This is the matlab model of Boost converter supplied with Rectified ac source

SPM8是一款功能强大的神经影像计算软件，由 Wellcome Department of Imaging Neuroscience小组开发，可以对PET, EEG, fMRI等图像进行处理。对fMRI 数据的处理可以由预处理，个体统计分析，组分析来实现。(SPM8 is a powerful neuroimaging computing software developed by Wellcome Department of Imaging Neuroscience group. It can process PET, EEG, fMRI and other images. The processing of fMRI data can be implemented by preprocessing, individual statistical analysis, and group analysis.)

雷达仿真程序并用Matlab仿真，雷达仿真程序并用Matlab仿真(Radar simulation and use Matlab simulation, radar simulation and simulation using Matlab)

说明：  BCT,Brain connectivity Toolbox工具箱，内含demo以及各种网络属性和功能网络的相关代码。(BCT, brain connectivity toolbox, contains demo and related codes of various network properties and functions.)

某家电企业在全国二线城市的年销售量Y(单位：万台)与该城市人口数X1(单位:万人)以及该市人均月收入X2(单位:元)之间的关系，在某年对15个城市作了调查，得上述各量的观测值（见数据表data1.txt）(A household electrical appliance enterprises in the country in sales of second-tier cities, Y (unit: million units) and the urban population, the number of X1 (unit: million) and the city' s per capita monthly income X2 (unit: yuan) between, in a particular year made a survey of 15 cities, was the amount of the above observations (see data sheet data1.txt))

考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。(consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power)

VC++与MATLAB的混合编程的快速实现 讨论了如何用MATLAB的complier将*.m函数编译为动态链接库DLL，供VC++使用的方法。(VC++ and MATLAB programming for fast implementation of mixed discuss how to use MATLAB' s complier to*. m functions compiled as dynamic link library DLL, VC++ for the methods used.)