How to put a header in a txt file?

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Bruno Souza 2018-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/383826-how-to-put-a-header-in-a-txt-file

评论： shobhit pipil 2019-2-6

I'd like to put a header in my .txt file. I have a file with 744 lines like below. And I wanna put on the first line the header 'hora'.

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Akira Agata 2018-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/383826-how-to-put-a-header-in-a-txt-file#answer_306223

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Straight-forward solution would be like this:

% Read the file
fid = fopen('yourData.txt','r');
str = textscan(fid,'%s','Delimiter','\n');
fclose(fid);
% Add your header
str2 = [{'hola!'}; str{1}];
% Save as a text file
fid2 = fopen('output.txt','w');
fprintf(fid2,'%s\n', str2{:});
fclose(fid2);

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Akira Agata 2019-2-5

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Hi Shobhit-san,

Sorry, I don't catch your concern correctly.

Do you want to add a header in a txt data file (as described in the original question)?

Or, do you want to read txt data file as a numeric array?

Anyway, I believe the following slightly modified code can do both of them. I hope this will be some help to address your problem!

fileList = dir('Input/*.txt');
for kk = 1:numel(fileList)
    % Read the file
    fid = fopen(['Input/',fileList(kk).name],'r');
    str = textscan(fid,'%s','Delimiter','\n');
    fclose(fid);
    
    % Convert data into numeric matrix
    data = str2double(str{1});
    
    % ----------------------------------------------------
    % Do something by your model which takes data as float 
    % ----------------------------------------------------
    
    % Add your header
    str2 = [{'hola!'}; str{1}];
    
    % Save as a text file
    fid2 = fopen(['Output/',fileList(kk).name],'w');
    fprintf(fid2,'%s\n', str2{:});
    fclose(fid2);
end