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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神经网络工具箱应用简介,XIWANGYOUYONG(About Matlab neural network toolbox application)

The modeling of the three phase induction machine is explained in this matlab simulink model.

this is an important code.

This Matlab script solves the linear boundary value problem, second-order finite differences, as explained in the text.(linear ODE Function)

heed simulation on matlab

分别采用RGB模型和HIS模型对图像imageLane.bmp进行锐化，并比较锐化的效果是否相同（两锐化后的图像相减）。(Using RGB model respectively for imageLane image and HIS model for sharpening, BMP, and compared the effect is the same sharpening (two sharpen the image subtraction).)

说明：  OFDM源代码，基于MATLAB系统仿真(OFDM simulation source code)

计算gps信号接收机两点间的距离，代码通俗易懂(Calculate the gps signal receiver distance between two points)

蒙特卡罗辐射传输计算，用于医学诊断和大气辐射传输计算(monte carlo radiative transfer)