Matlab

SOS! Very slow Matlab xlsread...
Hi all, I have a big Excel file that I need to read into Mablab. It has 40 sheets, and iteratively for each sheet, I need to read in a bunch of stuff as the following: [tmp cellstrDates]=xlsread1(strDataFileName, strCurrentSheet, 'B23:B65535'); Because the content on the sheets will keep growing, so there... 3 Feb 2010 10:33

Question on ML04 Calculator Exercises from Mathworks Training Services
To MATLAB trainers, Regarding training course ML04 (MATLAB for building GUI 2009R3) ML04 calculator example. Why is it the callback field of the "Help\About Calculator ML04 Ctrl-G" shows blank but the callback will work? That is, it still display "Isn't this funnnnnnnn!". I thought one has to put in the appropriate ca... 2 Feb 2010 21:59

Catching Java exception
I'm try to retrieve data from several web addresses. I set a for loop and for each single loop I build the URL string and then pass it to the following code: buffer= java.io.BufferedReader(... java.io.InputStreamReader(... openStream(... java.net.URL(url_string)))); If the URL is not available I ge... 3 Feb 2010 18:32

dir function and my poor numbering system
Hi, I have 1000's of .csv files that have a poor numbering system like this: data1 data2 ....... data99 data100 data101 and when I use the 'dir' function, it sorts then by the first digit after the word 'data.' Is there anyway to have the dir function or some other function sort by the whole value after t... 3 Feb 2010 12:50

displaying image in axes
In my GUI, i have connected my webcam. The webcam will automatically snap 3 photo and store in a folder in my computer. The coding to snap photo and save photo are as below: img1 = getsnapshot(vid); fname = ['Image' num2str(ctr)]; % make a file name imwrite(img1, 'C:\Images\img1.tiff' , 'tiff'); I have create... 2 Feb 2010 23:36

Melard's Algorithm
Does anyone know of an implementation of Melard's Algorithm for estimating ARMA parameters? The armax MATLAB method won't work because it gives residuals with significant autocorrelations. ... 2 Feb 2010 21:59

how to create a pop up message box
I have GUI, when user press a push button, it will pop up a message with a 'OK' button saying "Thank you for you info". When user click the 'OK' button, the GUI will go to next GUI. Can anyone guide me how to do it? Thank you. ... 2 Feb 2010 21:59

dlmwrite without erasing the file i'm writing to
Hi, I am trying to use the matlab function "dlmwrite" to write a string to a csv file. I do not want it to erase the entire csv file, I just want it to input what i told it to, where I told it to without affecting the rest of the file. Does anyone know if it is possible with the dlmwrite function? Thanks, M ... 3 Feb 2010 09:26

FFT of white noise
I try to do some simulation based on white noise, which is generated by the bottom code. White noise should have a flat frequency spectral density, which means the magnitudes should be equal and constant on each frequency components, while it looks like random in the plot. Can anyone explain this? Code: clear; noi... 2 Feb 2010 21:59

Plotting with ticks in engineering format
The following produces a plot with x ticks of "0, 1, 2, 3 .... 10" with the "x10^7" displayed once in the lower right (similar for the y ticks) y = [0:10e6:100e6]; plot(y,y) I would like to be able to plot this in engineering format, meaning the x ticks would be "0, 10, 20, 30 .... 100" with the "x10^6" still di... 2 Feb 2010 15:30