Matlab

MATLAB/Simulink, Virtual Reality and Cave Automatic Virtual Environments
We have a 6 sided cave-type system and are interested in figuring out how to use matlab in our system. Best, -Dave "Martin Trauth" <trauth(a)geo.uni-potsdam.de> wrote in message <h7pa3u$986$1(a)fred.mathworks.com>... Dear all, I am curious to hear whether MATLAB and/or Simulink and/or Simulink 3D Animatio... 17 Jun 2010 16:45

Inverse Fourier transforms
I need to compute an inverse Fourier transform, I did this previously by writing my own inverse Fourier transform routine which worked pretty well on simple examples but I am currently investigating some rather obscure wave profiles. I computed these wave profiles two ways and the answers don't agree, so I thought ... 30 Jun 2010 10:52

Memory Usage
Why is it better to preallocate memory with zeros instead of ones (A vs C below)? Also, why is it better not to allocate memory at all for D in the code below? Code example: clear; clc; C=ones([1000,1000,10]); A=zeros([1000,1000,10]); B=NaN*ones([1000,1000,10]); X=1000*rand(1000,1000,10); tic B=X; dt ... 17 Jun 2010 16:45

question about expanding an index
I have an index matrix where each element in the first column is an ordered index number (possibly with duplicates), and the second column provides the number of times that the corresponding index is to be replicated. Basically, i want to create a single vector that replicates each element in the first column the numb... 18 Jun 2010 13:32

Smooth surface mesh/grid
"Jo " <bobbyjoe23928(a)gmail.com> wrote in message <hq0kk5$g87$1(a)fred.mathworks.com>... Using surface to create a patch grid results in a jagged surface. [x,y]=meshgrid(-2:0.5:2,-2:0.5:2); z = x.^2-cos(5*x).*y.^2; surface(x,y,z,'EdgeColor',[.8 .8 .8],'FaceColor','none') Because I'm computing c... 17 Jun 2010 17:52

Fourier transform
Hi, I have some data generated in space-time domain and I want to Fourier transform it to wavenumber-frequency domain. I have nf as my total frequency samples and dt as my sample interval in time while nk is my total wavenumber samples and dx is the sample interval in of space. I have used fft as follows: Y = fft... 17 Jun 2010 14:31

How to eliminate empty initalization function in code generated by RTW embedded code?
Hi, I want to eliminate empty initialization functions in code generated by RTW embedded coder (see example below). Any hint on how to eliminate these empty initialization function are wellcome. Thanks Klaus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Example: Given a simple Simulink model (say "ADD.mdl") with following d... 18 Jun 2010 06:57

DAQ parallel processing
I have a NI-daq device that I'm using to input an analog and two digital signals. In order to keep up with the incoming datastream and ensure that no data is lost, I've been attempting to use the parallel computing toolbox to process the analog signal on one worker, the digital signals on another, and combine the tw... 21 Jun 2010 14:40

grouping in text file
Hello, I have a problem with grouping text data together. I have a text file as such: date time n numval numval numval numval -, -, 8, 1.123 1, 23, .214 -, -, 8, 1.512 1, 45, .435 -, -, 8, 1.133 1, 32, .522 -, -, 14, 6.421 0, 0, 0 -, -, 8, 1.233 1, ... 17 Jun 2010 16:45

Fitting to Gaussian Distribution
Hi all, I have a 3D image, indicating scalar E-field intensity distribution of 729*561 points. I need to fit E-field intensity distribution to Gaussian distribution, would you please suggest me how is that possible? Bests, Behnam ... 17 Jun 2010 13:24