highfrequency

对任意大小的灰度图像进行zig-zag变换和反变化，或者是对DCT之后的图像进行zig-zag变换，确定其中频信息。(Any size of gray-scale images in zig-zag transform and anti-change, or is the DCT of the image after the zig-zag transform, to determine which frequency information.)

This contain small part of code

this is a book in geometry by shanti narayan...

这是一个基于空时分组编码的MIMO_OFDM通信系统的仿真设计。此系统包括QPSK调制解调，IFFT调制，空时编解码，基于训练符号的信道估计等通信模块。(This is a space-time block codes based on the MIMO_OFDM Communication System Simulation and Design. This system consists of QPSK modulation and demodulation, IFFT modulation, space-time coding and decoding, based on training symbols such as communication channel estimation module.)

一个小而有效的程序来执行的K -近邻搜索算法，此算法利用JIT 理论加速循环，比向量化有效解决了大量数据的精度问题。甚至比kd-tree效果要佳(A small and effective procedures to implement the K- nearest neighbor search algorithm, this algorithm uses JIT acceleration cycle theory, than to solve a lot of data to quantify the accuracy of the problem. Even more than the kd-tree effect has to be good)

clustering_code ,Clustering Through Ranking On Manifolds Version 0.2 Copyright by Markus Breitenbach and Gregory Z. Grudic (clustering_code. Clustering Through Ranking On Manifolds Versi on 0.2 Copyright by Breitenbach and Greg Markus watch Z. Grudic)

说明：  本算法采用遗传算法，用于辨识复杂洛伦兹系统参数。(Identification of Lorentz System Parameters)

power_transfo3wdn.rar,功率电子领域matlab仿真文件，已经验证过，程序运行正常(power_transfo3wdn.rar,Power electronics field matlab simulation file, has already been verified, the normal operating procedures)

解析Comtrade数据文件 电力行业标准数据文件(decode the Comtrade file)

说明：  在matlab中画Lorenz吸引子的源代码(Lorenz attactor)