MatlabK-means

计算光子晶体态密度的程序，与文献吻合，只要小的修改就可计算其他结构的态密度(photonic crystal calculation of the density of states procedures, in line with the literature, as long as minor modifications other structures can be calculated density of states)

The objective is to illustrate the importance of image phase

Determinant of the permutation matrix with rows ordered by p.

QUIVERS(x,y,u,v,Gscale,Spos,Sunit) plots velocity vectors as arrows with components (u,v) at the points (x,y). The matrices X,Y,U,V must all be the same size and contain corresponding position and velocity components (X and Y can also be vectors to specify a uniform grid).

设计一个按照时间抽取的基2快速傅里叶变换（基2FFT-DIT）。输入倒位序，输出自然顺序。(Design is taken in accordance with the time radix-2 fast Fourier transform the (base 2FFT-DIT). Enter the inversion sequence, the output of the natural order.)

用FDTD的方法对3维光子晶体的光子带隙进行模拟，得要直观图。 程序用MATLAB编写。(With the FDTD method on three-dimensional photonic band gap photonic crystal simulation, may be visual map. Programs written with MATLAB.)

This m files and Gui files are for solve the problem about Find specific position in 3D space. by using 3d circles you can axis in 3d spaces except one situation explaned as not selected axis x,y,z if you want to know more about seek the position in 3D spaces than depress the zip file and operate m file named Robot_report1 and Robot_report1.fig

三个空间错开漩涡光束右旋螺旋形焦点在xy平面的强度分布计算程序(XY distriburion of right handed spiral focal spot)

图像拼接程序，挺好用的，试试看吧，应该可以的，呵呵(Image stitching process, quite good use, and try it)

说明：  跳频通信的matlab文件,对学习扩频通信有很大的帮助 (fhss introduction made in matlab)