xiaochuqushixiang

一个计算多维定标（MDS）的matlab源代码，用于高维数据的维数约减(A calculation of multidimensional scaling (MDS) of the matlab source code for the high-dimensional data, dimensionality reduction)

本章先分析说明伪谱法求解波动方程的算法原理，再给出弹性波场伪谱法数值模拟的改进算法；然后，通过直接引入P波波场变量和S波波场变量，给出可实现弹性波场的P波和S波分解的波动方程，并用伪谱法实现弹性波场的P波和S波分解的数值模拟；最后用伪谱法对井间地震的复杂波场作数值模拟，分析井间地震波场中各种波的传播规律。(In this chapter, the principle of pseudo-spectral method for solving wave equation is analyzed, and then an improved algorithm for numerical simulation of elastic wave field is given. Then, by directly introducing P-wave field variable and S-wave field variable, the wave equation which can realize P-wave and S-wave decomposition of elastic wave field is given, and the P-wave sum of elastic wave field is realized by pseudo-spectral method. Numerical simulation of S-wave decomposition; finally, pseudo-spectral method is used to simulate the complex cross-well seismic wave field and analyze the propagation law of various waves in cross-well seismic wave field.)

Photonic crystals are attractive optical materials for controlling and manipulating the flow of light. One dimensional photonic crystals are already in widespread use in the form of thin-film optics with applications ranging from low and high reflection coatings on lenses and mirrors to colour changing paints and inks. Higher dimensional photonic crystals are of great interest for both fundamental and applied research, and the two dimensional ones are beginning to find commercial applications. The first commercial products involving two-dimensionally periodic photonic crystals are already available in the form of photonic-crystal fibers, which use a microscale structure to confine light with radically different characteristics compared to conventional optical fiber for applications in nonlinear devices and guiding exotic wavelengths. The three-dimensional counterparts are still far from commercialization but may offer additional features such as optical nonlinearity require

coding for FVM-based numerical solution

高阶谱分析工具，包含所有分析函数，快来下吧(High-order spectral analysis tools, including all the analysis functions)

行列式阶次辨识在白噪声的情况下通过计算DR的值得到最终的结果。(The order identification of the determinant in the case of white noise by calculating the DR' s worth to the final result.)

matlab编的甲醇间歇精馏建模仿真。采用微分方程计算的。(matlab code modeling and simulation of batch distillation of methanol)

计算有空气孔介质光子晶体的色散曲线，供大家交流，互相学习(Calculated free pore Photonic crystal dispersion curves for all to exchange, learn from each other)

干涉雷达处理的著名开源包，可以直接使用，建议做雷达干涉的下载(InSAR processing well-known open source packages can be used directly, it is recommended to do radar interferometry Download)

说明：  K-MEANS算法是输入聚类个数k，以及包含 n个数据对象的数据库，输出满足方差最小标准的k个聚类。 (K-MEANS algorithm is the input number of clusters k, and n a data object that contains the database and output to meet the standard minimum variance k-clustering.)