FDI1_1

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)

MSChart操作实例，可以轻松编码实现饼图，折线图，柱状图(MSChart operation example, you can easily Coding pie charts, line charts, bar charts)

电力系统仿真软件DIGSILENT和MATLAB连接的官网上的例子。(Examples of the official website of the power system simulation software MATLAB DIGSILENT and connections.)

模拟声源在两种介质中产生的声波的传播，采用SPML作为吸收边界(we simulate the propagation of acoustic wave in two media. we use SPML as the boundary conditions.)

Fault-Tolerant Control (A Fault-Tolerant Control Architecture for Induction Motor Drives in Automotive Applications)

一维光子晶体计算透射率和发射率，TM模式，mur边界条件，总场散射场模式(Calculation of one-dimensional photonic crystal transmittance and emissivity, TM mode, mur boundary conditions, the total field scattered field pattern)

高压直流输电6脉波整流加逆变器，自己搭的simulink模型，运行无错误(Six-pulse rectifier plus inverter for HVDC transmission.Self-built Simulink model, running error-free)

非线性混沌工具箱，可以用来求解非线性系统的分叉、混沌等(Non-linear chaotic toolbox can be used to solve the nonlinear system of bifurcation, chaos, etc.)

说明：  是一本关于matlab程序设计语言的电子书,是由西安电子科技大学出版社出版的(Is one on the matlab programming language for e-books, by the Xi)

说明：  遗传算法matlab代码，经过检测无错，希望对大家有用(Genetic algorithm matlab code, error detection)