junhenghua

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（7.x系列）从入门到精通一书的源码 包括结果截图 实用性很强(Matlab (7.x series) from entry to master a book source, including the results of screenshots Very practical)

知识进化多目标领域的一篇经典之作，已被同行广泛认同，相信给大家的学习和研究会带来帮组，欢迎下载！(Knowledge of a field of multi-objective evolutionary classic, has been widely recognized by his peers, I believe for everyone to learn and research will bring help group, welcome to download!)

智能优化算法matlab程序实现，包含各种算法的程序代码(Intelligent optimization algorithm matlab program )

用matlab实现的adaboost分类器算法Implemented(Implemented with the matlab adaboost Classifier)

图象处理：计算连通域的面积、周长、圆形度、矩形度以及长宽比(Image processing: computing connected domain area, perimeter, roundness, and aspect ratio rectangular degree)

说明：  matlab中的关于微分方程实验方面的例子和程序(matlab in the example of experiments on differential equations and procedures)

This is PCA source. please contact me if you have some question.

在matlab中编制Levy法辨识程序并进行测试(Identification procedures for the preparation of the Levy method in matlab and tested)

这是关于智能天线的自适应算法的MATLAB代码(This is the smart antenna on the adaptive algorithm of MATLAB code)