read csv file real time

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Alissa
Alissa 2014-6-20
评论： Rupali Wagh 2019-7-15
Is it possible to read a csv file in real time in matlab? ie as data is being written to the csv file, can matlab read it in real time? Thanks in advance! :)
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Rupali Wagh
Rupali Wagh 2019-7-15
hi i have same problem regarding real time csv , can u plase share the code the real time read csv .
thanks in advance!!!!

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Image Analyst
Image Analyst 2014-6-20
It can be open by two apps, as long as the first app didn't put a lock on it. For example, open a csv file in notepad or wordpad, and you can still do whatever you want with it in some other app. Though the first app will have a "snapshot" of what it looked like when it read it in - it won't update "live" as the other app changes it. Some apps, such as MATLAB, will recognize when the file on disk has changed. For example open a text file in the editor and then in wordpad and change it and save it in wordpad. Then when you return to MATLAB, it will say the file has changed on disk and ask if you want to reload it.
I don't know if MATLAB's fopen() puts a lock on the files. You could easily check though.
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Alissa
Alissa 2014-6-23
Thank you for your answer! I am now using csvread in a while loop to read the file in real time. However, I am getting the error:
Error using dlmread
Mismatch between file and format string.
Trouble reading number from file (row 1415u, field 8u)
The code will read about 15 new lines of the csv file before giving this error. Would you possibly know what is causing this? Thanks!
Image Analyst
Image Analyst 2014-6-23
Most likely every row does not have the same format. Look at line 15 and see how it differs from line 14.

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