Ch06

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)

这个是有限数字滤波器的设计程序，有低通高通，带通等滤波器设计。(This is a limited number of filter design process, a low pass high pass, band pass and other filter design.)

晶闸管单相整流电路matlab仿真，可以改变触发角。(Thyristor single phase rectifier matlab simulation, you can change the firing angle.)

利用粗糙集实现对数据的清洗，清洗掉无效的数据(he use of rough set to achieve the data cleaning, cleaning out invalid data)

这是一章山西大学物理系开的matlab课程的课件(This is a Department of Physics, Shanxi University chapter of matlab programs open courseware)

一个云模型的例子，用来做预测和估计，刚注册成为会员，还是新手，请大家多多指教(cloud model example)

展示一个定积分的数值,图中阴影区域显示了当前的子区间与子区间积分,颜色切换到绿色得到准确性.(Demonstrate numerical evaluation of a definite integral. The shaded area shows the integral over the current subinterval. The color switches to green when the desired accuracy is obtained.)

一个用于实测信号处理处理与分析的实例，主要有时域分析和频域分析(A processing instance of the processing and analysis for the measured signal mainly sometimes domain analysis and frequency domain analysis)

程序用pq分解法，通过matlab进行设计来计算电力系统潮流(Program with pq decomposition method, designed to calculate the power flow through matlab)

本人对经典Maxflow算法的修改，实现的是C++和Matlab混合编程。cpp源码可以在matlab下编译，该实现方式比纯matlab实现效率高出好多。(I classic Maxflow algorithm changes, realize that the C++ And Matlab programming mixed. cpp source code can be compiled under matlab, the matlab realize than pure efficiency than many realize.)