How to add a new line in the middle of a text file?

Question

Ellen 2014-12-19

0
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https://ww2.mathworks.cn/matlabcentral/answers/167200-how-to-add-a-new-line-in-the-middle-of-a-text-file

编辑： per isakson 2014-12-19

Hi all,

I have a text file in which I need to add a new line of text using Matlab. I know the number of the line, where the line should be inserted. However, I don't know how to create and fill a new line at this position. Can any of you help me out?

Thanks, Ellen

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Answer 1

per isakson 2014-12-19

4
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https://ww2.mathworks.cn/matlabcentral/answers/167200-how-to-add-a-new-line-in-the-middle-of-a-text-file#answer_162812

编辑：per isakson 2014-12-19

在 MATLAB Online 中打开

There is no "smart" way. One has to read the existing file and write the new. If the file isn't too large this could be a starting point.

    fid = fopen( old_filespec );
    cac = textscan( fid, '%s', 'Delimiter','\n', 'CollectOutput',true );
    fclose( fid )
    fid = fopen( new_filespec, 'w' );
    for jj = 1 : insert_here
        fprintf( fid, '%s\n', cac{jj} );
    end
    fprintf( fid, '%s\n', new_line );
    for jj = insert_here+1 : length(cac)
        fprintf( fid, '%s\n', cac{jj} );
    end
    fclose( fid );