how to modify a file. txt

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Federico Paolucci
Federico Paolucci 2022-10-28
评论： Jan 2022-10-29
Hello,
I would like some advice from someone to do this job: I have to copy the lines of a text file to an another text file created by me until it comes from a certain string. Arrived at this string, I stop copying and I have to insert at the end of these copied lines other lines of text coming from a third .txt file
Thanks in advance for the advice
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MR
MR 2022-10-28
Hi,
does this help you?
% Open file
file = fopen('myFile.txt', 'w');
% Write text into my txt file which I just created
fprintf(file, 'My own Text goes here.');
Federico Paolucci
Federico Paolucci 2022-10-28
@Mathieu NOE yes, i wrote some lines to load the first file
@MR Yes, I did it
Thank you

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采纳的回答

Jan
Jan 2022-10-28
编辑：Jan 2022-10-29
C = readlines('YourFile.txt');
idx = find(contains(C, 'TheWordYouAreSearching'), 1);
writelines(C(1:idx), 'Output.txt'); % [EDITED] Data at 1st, file name at 2nd
D = readlines('The3rdFile.txt');
writelines(D, 'Output.txt', 'WriteMode', 'append'); % [EDITED], see above
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Federico Paolucci
Federico Paolucci 2022-10-28
thanks for these lines! But they give me an error.. can you help me?
Error using writelines
writelines('Output.txt',C(1:idx));
↑
Invalid argument at position 2. Value must be a character vector or string scalar.
Error in MainScript (line 92)
writelines('Output.txt',C(1:idx));
Jan
Jan 2022-10-29
@Federico Paolucci: If a command fails, look into the documentation:
doc writelines
There you see, that the first argument is the data and the second one the file name. I've swapped them.
The code is fixed now.

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