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matlab_FEM_dismesh
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)
- 2010-06-05 09:17:55下载
- 积分：1
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观测器PID
说明： 充分利用估计误差的比例,积分,微分信号考虑一类线性系统的参数化观测器设计问题,在加快观测器收敛速度的同时避免较大的超调.从理论上分析此类观测器设计的可行性,并从实际应用角度给出一种简单可行的参数设计方法.仿真实验表明:该观测器不但易于实现而且能够获得较好的估计效果,从而有利于在实际工程中的应用.(In this paper, the proportional, integral and differential signals of the estimation errors are fully utilized to consider the design of the parameterized observer for a class of linear systems. The convergence speed of the observer is accelerated and the overshoot is avoided. The feasibility of the design of the observer is analyzed theoretically, A simple and feasible parameter design method is given from the point of view of practical application. Simulation results show that the observer is not only easy to implement, but also can obtain good estimation effect, which is conducive to the application in practical engineering)
- 2020-07-09 09:37:09下载
- 积分：1
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rgb-yuv
该程序源代码实现了RGB-->YUV转化(RGB-->YUV)
- 2010-06-08 18:17:51下载
- 积分：1
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Matlab-and-Numerical-Analysis
Matlab与数值分析简明教程,一共十章，针对不同类型的数值分析，每章一个数值分析实验，有详细的代码，以及练习(Matlab and numerical analysis of a simple tutorial, a total of ten chapters for different types of numerical analysis, each chapter a numerical analysis of experiments, the code in detail, as well as practice)
- 2012-05-31 18:34:55下载
- 积分：1
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matlab_perf
一篇介绍matlab实现高效编程的文档，对于每一种方法都有相关的例子(An efficient introduction matlab programming documents, for each method are related to the case)
- 2011-07-30 22:49:35下载
- 积分：1
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CS4VM
In this paper, we study cost-sensitive semi-supervised
learning where many of the training examples are unlabeled
and different misclassification errors are associated
with unequal costs. This scenario occurs in many
real-world applications. For example, in some disease
diagnosis, the cost of erroneously diagnosing a patient
as healthy is much higher than that of diagnosing a
healthy person as a patient. Also, the acquisition of labeled
data requires medical diagnosis which is expensive,
while the collection of unlabeled data such as basic
health information is much cheaper
- 2014-10-21 00:18:03下载
- 积分：1
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Pipe
用 windows 管道与 MATLAB 建立连接(bridging MATLAB with Windows pipe)
- 2013-04-02 19:19:04下载
- 积分：1
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ICM_Algorithm
ICM_Algorithm Markov Random Field
- 2011-12-27 05:45:22下载
- 积分：1
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median-filter-matlab-source-code
matlab中值滤波源代码，对于图像处理的人员有一定的参考意义。。(median filter matlab source code for image processing personnel have some reference value. .)
- 2013-12-11 15:16:58下载
- 积分：1
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ghfilter
说明： 一段图像处理的高斯高通滤波器的matlab源代码，思路清晰，可以直接运行。(A Gaussian image processing of high-pass filter matlab source code, clear, can run.)
- 2010-05-02 17:13:55下载
- 积分：1
