mcmcexamples

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)

利用MATLAB产生7位、13位巴克码并画出频谱图。(Generated 7、13 Barker code and draw the frequency spectrum using MATLAB. )

说明：  MATLAB5_X程序设计语言.pdf 用于matlab程序设计(MATLAB5_X programming languages. Pdf for matlab programming)

神经网络PID控制算法的实现，相比于PID，神经网络PID具有更好的控制效果。(Neural network PID control algorithm, compared to PID, PID neural network has better control effect.)

MATLAB的部分工具箱函数，对matlab工具箱使用有详细介绍。(The MATLAB toolbox function matlab toolbox detail.)

说明：  可支持matlab使用SVM支持向量机，结合粒子群算法。(Support matlab to use SVM support vector machine)

说明：  GSM系统卷积码和交织编码在突发信道和AWGN信道误码特性(GSM system convolutional code and interleaved coded in the emergency channel and AWGN channel BER performance)

以控制系统为对象进行建模分析，通过在matlab中进行介绍(Control System Analysis)

均匀线阵方向图仿真程序 包括静态方向图 阵列方向图 带切比雪夫权的阵列方向图的仿真(With a cut over the right plane array direction Schiff Figure simulation)

说明：  比较俯仰角度分别为60°，90°，以及极化参数为60°和90°时的三极子天线和两极子天线的均方根误差(Comparison of tilt angles of 60 °, 90 °, and the polarization of 60 ° and 90 °, three-pole antenna and polarization Antenna root mean square error)