improve PI model

plotangle函数是一个可以用来画两个向量夹角的函数.(plotangle function is a painting can be used to the angle between two vectors function.)

Con este archivo tu puedes decodificar un sonido morse y lo conviertes a palabras

LPI国外的雷达教程上的源程序，可以对照书上讲解进行学习(LPI tutorials on the radar of foreign source, can explain the book to learn the control)

a matlab code on duper resolution

求卷积,可是做适当的修改，用于MATLAB中。(when we need to carculate convolution.It s indeed useful.)

为研究局部阴影效应对光伏发电系统的影响，首先建立了光伏阵列工程数学模型，分析局部阴影条件下光伏阵列的输出特性。为了便于工程分析，该文利用PVSYST软件分析比较单晶硅、多晶硅和薄膜电池等3种不同材料光伏电池在局部阴影条件卜的输出功率，为工程应用提供了良好的指导作用。最后提出了几种提高光伏阵列抗局部阴影能力的措施厂 (To investigate the effect of local shading effects on photovoltaic systems, photovoltaic array project was first established mathematical model to analyze the output characteristics under conditions of partial shading of the PV array. In order to facilitate engineering analysis, this paper use PVSYST software analysis and comparison monocrystalline, polycrystalline and thin film batteries, photovoltaic cells of three different materials in partial shade conditions Bu output power for engineering applications provide a good guide. Finally, several photovoltaic arrays to improve the ability to measure resistance to partial shade plant)

O Reilly.Practical.C++.Programming.chm,电子书籍，英文版。(O Reilly.Practical.C++.Programming.chm,E-books, in English.)

说明：  this is matlab based signal processing code

利用matlab的simulink建立了直流升压变流器的方正模型，仿真的到了较好的结果(Simulink of matlab using established DC converter step-up model of the Founder, simulation of the good results)

for prediction. some code for time series prediction