cryptography

说明：  k-中心与qpso算法的结合，从文档中读取对象数据，没有维限制。需要设定类别数，先由k-中心计算出各类中心，然后由qpso优化，得到聚类结果，并保存聚类信息。(algorithm for k-medians and qpso combination of object data read from the document, there is no dimension restrictions. Need to set the number of categories, first calculate the k-medians types of center, and then optimized by qpso obtained clustering results, and save the clustering of information.)

it is about sammon map in tha clustering.

本工具箱主要为学习数学建模和参加中国大学生数学建模竞赛的同学而制作。汇集了 数学建模常用的最优化、微分方程、数据拟合、统计等方面的计算工具，包括我们自 编的补充工具。工具箱还汇集了96-99中国大学生数学建模竞赛题解MATLAB程序。本 工具箱也可供使用MATLAB作数值计算的学生、教师和科技人员参考。(This toolkit is mainly mathematical modeling study and participated in the China Mathematical Contest in Modeling the production students. A collection of commonly used mathematical modeling optimization, differential equations, data fitting, statistics and other aspects of computational tools, including our self complementary tool. The toolbox also brings together 96-99 China Mathematical Contest in Modeling problem solution MATLAB. The toolkit is also available using MATLAB for numerical calculation of the students, teachers and technology officers.)

三相并联有源电力滤波器，基于瞬时无功理论的ip-iq电流检测法，三角波比较控制，抑制谐波电流(Three-phase shunt active power filter based on instantaneous reactive power theory, ip-iq current detection method, the triangular wave comparison control, inhibition of the harmonic current)

Spectrum analyzer with USRP, GNU Radio and MATLAB

MATLAB6实例教程 _ 郝红伟编著_ - 北京_ 中国电力出版社, 2001年9_0(Tutorial examples MATLAB6 edited by郝红伟_ _- _ Beijing China Electric Power Press, 2001 9_0)

说明：  A simple alamouti space time coding

message regarding disperssion effect in communication

La señ al x(t) = 2 cos(11.200πt) + 2cos (10.000 πt) cos (1.000 πt) se suma a una señ al de ruido blanco (coloreado) gausiano de banda limitada con media igual a cero y con una densidad espectral de potencia de 1 µ w/Hz hasta una frecuencia de 15.000 Hz y cero a frecuencias mayores.

说明：  C+陷阱与缺陷,适合于各个阶段的学习者学习!(C+ traps and defects, suitable for all phases of learners!)