how to modify a file. txt

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

[Mathieu NOE]

hello

what have you tried so far ?

if you don't know where to start from look for how processing strings and char array

like

MATLAB - Strings (tutorialspoint.com)

[MR]

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]

@Mathieu NOE yes, i wrote some lines to load the first file

@MR Yes, I did it

Thank you

Answer 1

[Jan]

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

[Federico Paolucci]

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]

@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.