Matlab

std for each pixel in a sequence of images
Hi, I'm an inexperienced matlab user and I'm trying to find the standard deviation for each pixel in a sequence of images. Each image is 512x512 and between 500-1000 frames long, so something like this is computationally expensive... mat1 = zeros(512,512,100,'uint16'); for readin = 1:100 [mat1(:,:,readin)] = im... 11 May 2010 19:01

fzero logical error
I have problem running for the first time, the below function but when I run it again it works fine. I am unable to trace out the error. I am solving for 'y' and all others are defined. For instance, if y is the variable, then: x =100; Peri = 1e4; rhoc = 4.5 ficrho = 0.9; g = 9.81; Fun=@(y)(x/(Peri)... 11 May 2010 17:54

2D Acoustic Taper Waveguide and Recursive convolution
Hi, Does anyone have an implementation/solution for a 2D Acoustic/Generic Taper waveguide? If not can anyone suggest me to the literature dealing with it. I have a code for simulating the propagation of a wave in a dispersive parallel plate waveguide. I was thinking of trying to recursively convolve the my cha... 11 May 2010 17:54

statistical t test to compare two groups
Hello I have a basic statistic question. I have two sets of dataset. I would like to test where the mean of the first group is significantly larger than the other group. I am wondering whether there is direct test or not. What I thought is that 1) do the t-test to compare the mean of these two group is... 12 May 2010 11:21

matlab back propogation neural network
hi ppl.... i hv the following code in matlab p=[Vf1max;Vf2max;Vdmax;Vf1min;Vf2min;Vdmin;Vf1avg;Vf2avg;Vdavg]; t=[0 1]; net=newff(p,t,3); [net,tr]=train(net,p,t); a = sim(net,p); i got an error as follows: ??? Error using ==> network.train at 146 Targets are incorrectly sized for network. Matrix must hav... 12 May 2010 05:52

dicominfo not returning RadionuclideTotalDose header field
I have a dicom file taken from a GE Advance PET/CT scanner and one of the fields present is the RadionuclideTotalDose indicating how much activity the patient was given. However, dicominfo does not return this field. Further, dicomdump (Jeff Mather) lists the field in the screen dump but it doesn't appear to be presen... 12 May 2010 09:07

Synchronous audio and plot output of a STFT signal
Hello, I have been given a signal with M points. I take consecutive N points in the signal, and window and FFT the N points, then put it into an output vector --> the process of STFT. The task now is to display the output vector on a plot that updates at every iteration (the plot is dynamic, and does not just show the ... 11 May 2010 17:54

Invoking Agilent ADS from Matlab
Hi, I have a wireless communication design that divide into a modem and RF system. The modem part was modeled using Matlab/Simulink and the RF using Agilent ADS. I would like to know if it’s possible to invoke ADS simulation from the Matlab environment or even perhaps interface my ADS simulation results into ... 11 May 2010 16:46

Command to create a .mat file
Hi folks, in R2008b version of Matlab I'd need to use a sort of command to create a new .mat file with a name I choose. Maybe I am blind, but in the documentation I only discovered moves to open and handle an existing .mat file. Thanks!! ... 12 May 2010 14:42

Unreadable coefficients expressed in syms
Dear professionals, I came across this problem. My model has to handle a large number of iterations. I believe the following slows down my efficiency. Essentially, how do I convert the coefficients in large numbers to double/short format while still displaying them in symbolic expressions. Would vpa(sym) work?... 11 May 2010 17:54