scale_free

(有源代码)数值分析作业,本文主要包括两个部分,第一部分是常微分方程(ODE)的三个实验题,第二部分是有关的拓展讨论,包括高阶常微分的求解和边值问题的求解(BVP).文中的算法和算例都是基于Matlab计算的.ODE问题从刚性(STIFFNESS)来看分为非刚性的问题和刚性的问题,刚性问题(如大系数的VDP方程)用通常的方法如ODE45来求解,效率会很低,用ODE15S等,则效率会高多了.而通常的非刚性问题,用ODE45来求解会有很好的效果.从阶次来看可以分为高阶微分方程和一阶常微分方程,高阶的微分方程一般可以化为状态空间(STATE SPACE)的低阶微分方程来求解.从微分方程的性态看来,主要是微分方程式一阶导系数大的时候,步长应该选得响应的小些.或者如果问题的性态不是太好估计的话,用较小的步长是比较好的,此外的话Adams多步法在小步长的时候效率比R-K(RUNGE-KUTTA)方法要好些,而精度也高些,但是稳定区间要小些.从初值和边值来看,也是显著的不同的.此外对于非线性常微分方程还有打靶法,胞映射方法等.而对于微分方程稳定性的研究,则诸如相平面图等也是不可缺少的工具.值得提出的是,除了用ode系类函数外,用simulink等等模块图来求解微分方程也是一种非常不错的方法,甚至是更有优势的方法(在应用的角度来说).((Source code) numerical analysis homework, this docment includes two parts, the first is ordinary differential equations (ODE) of the three examples, the second part is about the expansion of the discussion, including the higher-order ordinary differential & boundary value solution Problems (BVP). the text of the algorithm and numerical examples are based on the Matlab. ODE from the rigid (STIFFNESS) look into the issue of non-rigid and rigid problem, rigid problems (such as large coefficient VDP equation) such as using the always method ODE45 used to solve the problems , efficiency will be low, with ODE15S the other hand, many of the high efficiency. and the usual problem of non-rigid, there will be used to solve ODE45 very good results. Judging from the order can be for high-order differential equations and first-order ordinary differential equations, higher-order differential equations can be transformed into a general state space (STATE SPACE) used to solve the low-order different)

此电子书是英文版本的一本非常实用的MATLAB教程，希望能给大家带来方便(This book is the English version of a MATLAB tutorial is very useful, I hope we can bring convenience to)

说明：  这个源代码 实现了协作通信与OFDM技术的结合 信道估计采用LS一阶线性估计算法(This source code implements the communication and collaboration technology, combined with OFDM channel estimation using LS estimation method for first order linear)

说明：  自己编写的计算光流场的MATLAB程序，基于梯度的方法，非常简单(I have written a MATLAB calculation of optical flow procedures, based on the gradient method and it is very simple)

信道分配的方面的 希望大家看看 关于信道的(Channel assignment s aspect s hope everybody has a look )

Load flow: This file is to solve the load flow problem in power systems

说明：  对图片中字母数字识别，通过matlab实现(Recognition of letters and numbers in pictures)

说明：  包括各种图形图像处理的理论原理和软件方面的材料，提供可用现代软件工具实现图像处理的基础。(Including the theoretical principles of graphic image processing and software materials, to provide modern software tools available to achieve the basis for image processing.)

基于自适应扩展单元的微微小区无缝覆盖,针对60GHz RoF微微小区，提出了一种新的基于自适应扩展单元的切换方案。(Picocell seamless coverage based on adapting extended cell)

三相感应电动机单相短路故障的瞬态过程仿真，大家一起学习(Three-phase induction motor single-phase short-circuit fault transient process simulation, we study together)