Exercise4

使得最近打开的MATLAB图形开始下雪，如果没有已经打开的窗口，则首先创建一个窗口。(LETITSNOW- Make the figure snow! Usage: ------ letitsnow - Create snow in the CURRENT figure. If no figure exists, an empty figure will be created. letitsnow(figure_hdl) - Create snow in the figure represented by figure_hdl letitsnow(figure_hdl, color)- Create snow with the specified color color is a scalar ranged 0~1)

《Matlab高级编程》由高级编程技术、程序编译、Matlab与外部程序接口和高洁界面主题等几个方面的内容组成，介绍一些非常实用的技术。(Matlab Advanced Programming by the advanced programming techniques, program compilers, Matlab external interface API and noble themes, and several other aspects of the composition, introducing some very practical technology.)

本函数计算hankel函数一致展开中的变量(This function calculation hankel function unanimously expand the variable)

GOOGLE的图像检索程序，应用MATLAB编写，简单易懂，适用于初学者(GOOGLE image retrieval procedures, using MATLAB to prepare, easy to understand for beginners)

一种基于MATLAB程序的非周期点迭代程序算法(A non-periodic point iteration algorithm is based on the MATLAB program)

《MATLAB语言常用算法程序集》一书的源程序，好不容易找到的，奉献给大家！(Book " MATLAB language commonly used algorithm assembly source, hard to find, and dedicated to everyone!)

计算加权加速度,通过虚拟阵元进行DOA估计，现代信号处理中谱估计在matlab中的使用，代码里有很完整的注释和解释，使用高阶累积量对MPSK信号进行调制识别，三相光伏逆变并网的仿真。( Weighted acceleration, Conducted through virtual array DOA estimation, Modern signal processing used in the spectral estimation in matlab, Code, there are very complete notes and explanations Using high-order cumulants of MPSK signal modulation recognition, Three-phase photovoltaic inverter and network simulation.)

说明：  simulating a 3 phase voltage with various frequencies with matrix converter

textbook Turbo Pascal

一个关于神经网络的 SOFM算法的程序 改程序用C语言编写(A SOFM neural network algorithm on the procedure to change procedures for using C language)