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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)

《MATLAB程序设计教程》刘卫国第一版 源代码 水利水电出版社(" MATLAB Programming Guide" Liu Weiguo first edition of the source code Waterpower Press)

Statcom的matlab仿真，matlab2010版本，包含电压环和电流环，锁相等(Statcom matlab simulation, matlab2010 version, including voltage loop and current loop, lock equal)

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If you are a chess player you must know about .... Chess stalemate

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说明：  详细介绍matlab与神经网络应用的电子书籍，包含许多详细的示例及相关程序(Details matlab and neural network applications of e-books contain many detailed examples and related procedures)

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Teaching Genetic Algorithm Using Matlab