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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)

说明：  可进行位置识别,通过声源的波束形成,可知道其相关信息.再加上(can identify the location, source, a beam forming, know relevant information. Plus )

该程序模块实现了LTE-A（多天线环境下）预编码&检测(this module realise the LTE-A precoding and detecting)

实现神经网络PID 液位控制程序，对程序进行编程，仿真，此神经网络是BP神经网络PID控制液位的程序。(Neural network PID level control procedures, implementation programming, the software simulation, the neural network of BP neural network PID control level.)

此程序能实现很好的低通滤波，能很好的滤除低频分量，对于初学图像处理的人很有用(This process can achieve a good low-pass filtering, the filter can be a very good low-frequency components, for beginners who are useful image processing)

是matlab之语音处理与合成工具箱这本书的随书程序，很实用哦。珍藏！！！(good!!It s useful for you !!!!!)

- Stone column play important role in infrastructure, improving soft soil. The behaviour of stone column, however, remains far well understood

说明：  这是国外一本经典教材附带的程序，通信系统的matlab实现，所含例子丰富(This is a classic foreign materials attached to the procedures, communications systems to achieve matlab contains abundant examples of)

以前编的PID程序，关于模糊PID控制方面的，有需要的可以学习下。(PID process previously compiled on fuzzy PID control, and there is a need to learn next.)

一些经典的matlab GUI 制作例子，值得一看(some examples of matlab gui)