read from a text file

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bahare 2012-1-17

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Hi I have a very big text file containing a huge amount of data, I like to break it down to small parts and read each part separately in order to avoid the 'out of memory' error. is there any idea how to read the data?

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Answer 1

Sven Schoeberichts 2012-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/26317-read-from-a-text-file#answer_34362

在 MATLAB Online 中打开

doc textscan

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Answer 2

bahare 2012-1-17

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I have already read the help for this command, how ever I did not find any thing relevant to this command, does textscan command breaks down the data in a text file?

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Sven Schoeberichts 2012-1-17

C = textscan(fid, 'format', N) reads data from the file, using the format N times, where N is a positive integer. To read additional data from the file after N cycles, call textscan again using the original fid.

So it reads N lines. If you run the function again, it takes off where it ended, so you can use a loop to run through your data.

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Answer 3

bahare 2012-1-18

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Thanks, I tried to read the text from the line 1 to the line 100000, and then from 100001 to 200000, and so on, so I wrote my code in the following way: C=textscan(fopen('aug'),'%f %s', 100000, 'delimiter',',')); so how should I write to read the line 100001 to 200000 and then from line 200001 to 300000?