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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：  详细说明：这是作者自己编写的基于matlab语言的程序设计。遗传算法的函数优化 应用(Detailed Description: This is prepared by the author himself matlab-based program design language. Genetic algorithm function optimization applications)

无线通信中空时分组码matlab(simlink)仿真方案，空时编码方案为Alamouti方案。simlink的模块中的s-函数使用了C语言编写。(wireless communications Hollow time block codes Matlab (simlink) simulation program, space-time coding for ACS programs. Simlink Module of the s-function uses the C language.)

一个MATLAB GUI程序，可以方便地用来手动标记正训练样本和负训练样本。 —————————————————— 1.首先输入要标定的数据库目录、要存放正训练样本的目录、要存放负训练样本的目录 2.点击“开始”，程序自动依次显示数据库目录中的图片 3.点击“正例”或“反例”将会把当前图片复制到相应目录 4.可以在图片上点击拖动圈出一个区域，以截取圈出的区域作为样本 5.选中“约束选取比例”可以使得最终选取的样本有固定的大小(A matlab GUI program that can be used to label training samples manually. It contains rich functions)

粒子群优化算法与遗传算法结合，实现PID控制(PSO and genetic algorithm combined to achieve PID control)

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PLS程序，需要的拿去！亲，很好用的，大家可以试试！(PLS program needs to take it! Pro, good)