Memory Issues: Almost like clear doesn't fully work
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I am running 32b vista, Matlab 2009a. The machine has 4GB of RAM installed, PAE & 3G switch activated. the machine is dedicated to MATLAB and doesn't run anything else.
I have code that reads and writes data from disk. Data is stored in the form of txt files. There are thousands of text files around 200MB each in size. The code loads the text file into RAM processes it and then writes it back to disk.
Each load is done within a loop
for i = 1: numFiles
clear file (and all other variables I can see lurking around)
hence any RAM intensive processes are done in loadAndWriteData.m This returns on each call of the for loop.
I use memory.m to inspect the memomry availble to me. I see that after a few runs around the available memory starts dropping off. Then Matlab crashes with an out of RAM error.
I would have thought that as the function is returning each time around the loop, I would be nicely clearing everything in RAM.
What I am doing wrong? Any help gratefully received. thank you.
More Answers (3)
Matt Fig on 21 Apr 2011
How are you clearing the files? Are you using FCLOSE and checking the return variable?
I am not certain that clearing the file identifier will close the file. I don't see it in the documentation...
fid = fopen('myfile')
clear fid % Is the file in memory or not?
fclose(fid) % Does using this instead of clear help???
aasim Azooz on 22 Apr 2011
Try this for i = 1: numFiles loadAndWriteData(file(i)) clear all end
if it does not work, you may have a virus in your computer. It happened with me. everything went fine after I scanned my PC for viruses. good Luck Aasim Azooz