matlab_matrix-processing

DistMesh giving a singular FEM matrix?(Hi Anyone here with some experience of using DistMesh in finite element code? I m solving the scalar Helmoltz equation in an annular region in 2D: rho_1 < rho < rho_2 where rho_1 is the radius of a Perfect Electric Conducting cylinder and rho_2 is where the mesh is truncated using an Absorbing Boundary condition. Now, I ve written code to mesh the region myself (by dividing the region into annular rings and picking a fixed number of points on each ring) and I ve written another program which uses DistMesh to mesh the region. I get a nice solution using my own meshing code but the FEM matrix becomes singular when I use DistMesh. This is the DistMesh Code I used: Circle with hole rABC=1.5 rCyl=0.5 fdstring=sprintf( ddiff(dcircle(p,0,0, f),dcircle(p,0,0, f)) ,rABC,rCyl) fd=inline(fdstring, p ) box=[-2,-2 2,2] [p,N]=distmesh2d(fd,@huniform,0.04,box,[]) I tried changing box and the 0.04 value (initial edge length). But every time, the matrix becomes sin)

matlab的pde工具箱很薄弱，同时只能处理有限复杂度的问题，利用comsol强大的有限元分析与多物理场的耦合性，解决相当完美。 matlab与多物理场有限元软件的结合，本程序需要安装matlab7.0以上以及comsol multiphysics 3.0以上版本，建立客户端后可以方便的利用matlab控制有限元软件，进行建模计算。 本程序描述的是点电荷周围的电场以及电势。适合于初学者(The pde matlab toolbox is very weak, and can only handle a limited complexity of the problem, by using comsol powerful finite element analysis and multi-physical field coupling to solve quite perfect. matlab and multi-physics finite element software combination, the above procedure to install matlab7.0 and comsol multiphysics 3.0 or later, after establishing the client can easily control the use of matlab finite element software to model calculations. This procedure describes the electric field around a point charge and the electric potential. Suitable for beginners)

这是一个MATLAB课件 是MATLAB在电路分析中的应用(This is a MATLAB software is MATLAB in circuit analysis)

给出了一个针对非线性不确定未建模系统的观测器实例。采用了鲁棒滑模观测器算法。原始论文原理在程序注释部分。(An design example for sliding mode observer for nonlinear system.)

基本的matlab程序希望有原码的高手 多多提供共同学习(Matlab basic program hope to have the original code to provide a common learning more players)

2fsk信号的MATLAB调制，已运行过，正确(2fsk MATLAB signal modulation, has been run over, the correct)

MATLAB codes about rasta filter

Tests for <code>KeyPairGenerator</code> class constructors and methods.

应用于电力系统网络的潮流计算程序，将网络参数和运行的节点功率等数据(Used in the power system network flow calculation program, the network parameters and operating power and other data nodes)

三维地图，用于计算地形遮蔽等计算时的DEM数据(The 3D map is used to calculate the DEM data in the calculation of topography and occlusion)