Plotting Data From Constantly Updating Textfile

Question

Karl Haebler 2017-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/360940-plotting-data-from-constantly-updating-textfile

回答： KSSV 2017-10-12

I would like to plot data from a textfile which has a new entry every 10 seconds (or time period around 10 seconds), and for the plot to update as well.

To do that would I basically have to refresh the plot or rerun the program or is there a way to keep on reading a textfile whose length is always changing, and to add more data points to a plot to reflect the new data in the text file?

Thank you very much

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Answer 1

KSSV 2017-10-12

1
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https://ww2.mathworks.cn/matlabcentral/answers/360940-plotting-data-from-constantly-updating-textfile#answer_285432

在 MATLAB Online 中打开

You can get the time stamp of file if file gets modified....using:

FileInfo = dir('my text file') ;
TimeStamp = FileInfo.date;
% Get individual components of date & time in 1 Sec resolution
[Y, M, D, H, MN, S] = datevec(FileInfo.datenum);

When ever there is change in the time stamp, you read the file and plot/ update the plot. YOu can put the code in while loop.