Matlab

save timeseries to file
I would like to save timeseries objects to a file and then subsequently load them back into the workspace as timeseries. I am trying to do this to avoid having to recreate the timeseries each time I want to use them. Can this be done? ... 9 Feb 2010 19:41

question on using fft2 to calculate diffraction pattern
This post is a bit stale, but here's my take: There are times when the fast Fourier transform is not necessarily the fastest way to get the data you're looking for. If you want a high-resolution point-spread function (PSF) from a wavefront, one's first thought is you have to pad the heck out of the wavefront and th... 9 Feb 2010 13:58

damage measurement in a micrograph
Sir what you said is exactly right..But the model development of damage analysis is not my part..i'm only concerned with the extracting data from micrographs..thats my work... So extracting the number of facets is the difficult thing and i'm trying to do that...i have to develop a code to extract such details.. ... 9 Feb 2010 13:58

Skeletonization of a Grayscale image
Hi, Is there any way of skeletonizing a grayscale image in matlab? I know bwmorph can be used for binary images, but I need to skeletonize a grayscale image. I think this is possible in C++ but is it possible with matlab? Thank you for your help in advance. Sally. ... 10 Feb 2010 08:52

Evaluating Taylor expansion
Hi, How can I evaluate the following Taylor expansion in x=.01:.001:.01 so I can plot it. Thanks, syms x y=exp(x); taylor(y) ans = x^5/120 + x^4/24 + x^3/6 + x^2/2 + x + 1 ... 9 Feb 2010 13:58

help with nested loops
I have to find the nearest value from one set of data to another set, without going over. The two sets are two different timesteps. so for each value of time2, i need to find the nearest-without-going-over corresponding time1 value (its index) I do it this way right now, and it takes forever, but I get the correc... 11 Feb 2010 11:39

Numerical integration - Trapz, quad, quadl...
Hi, I am trying to calculate several integrals. It appears that in some cases, trapz provides a result while quad and quadl provides 0. In other cases quad and quadl provides results while trapz returns NaN. I understand the approximations behind each method but I don't know why one function provides results while ... 9 Feb 2010 16:16

Using Time Array Data in ODE Functions
Hi, I have a function that I pass to ODE45 to solve: dx = IM_DifferentialEquation(t,x) but within the function I want to include measured voltage data that is a function of time (time series data). The voltage data is in a 2 column array: column one is time, column 2 is the corresponding voltage value. Wha... 9 Feb 2010 11:41

Video Synchronization in Simulink
Hi, I connected four web-cams to my PC by the USB port. My PC is an Intel Pentium D 3.2 Ghz with 2Ghz of RAM. When i try to visualize the four videos in Windows (in the same time) by using the camera's software the videos stream seems fluent, but if i try to acquire the four videos by using the image acquisition toolb... 9 Feb 2010 11:41

Kill a process if it runs too long
Hello all, I'm calling some Fortran code from within a matlab loop, which usually takes ca. 10 seconds to run through per run. The whole program is set up like this: nmc = 1e3; while nrun < nmc nrun = nrun +1; !echo -e "orbitinp.tmp\n-100" | ./orbit % Followed by lots of stuff to evaluate the output ... 10 Feb 2010 17:56