write multiple line of text into a text file

Question

Ali 2017-8-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351473-write-multiple-line-of-text-into-a-text-file

评论： Walter Roberson 2017-8-5

Simple question; I have this variable which I want easily write to a text file (it can be a hundred of lines, I just cut it into 4 to fit here)

app.DCMtxt.Value

ans =

4×1 cell array
    '3  Message(s) transmitted '
    ''
    '      ws      BUS     ID     Rx    Node    DLC    Cycle    Extended'
    '    ______    ___    ____    __    ____    ___    _____    ________'

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Ali 2017-8-4

编辑：Ali 2017-8-4

Thanks for the replies. Per, it does not write to the file. I also get: Warning: Escaped character '\s' is not valid. See 'doc sprintf' for supported special characters. I see it reads it line by line, nice!

Ali 2017-8-4

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looks like Per's answer had a typo and otherwise working well, so I'm reposting it with minor change as an answer

fid = fopen('output.txt','w');
for jj = 1 : size( app.DCMtxt.Value, 1 )
    fprintf( fid, '%s\n', app.DCMtxt.Value{jj,1} );
end
fclose(fid);

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Answer 1

Walter Roberson 2017-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/351473-write-multiple-line-of-text-into-a-text-file#answer_276791

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 fid = fopen('output.txt','w'); 
fprintf(fid, '%s\n',app.DCMtxt.Value{:}) ;
fclose(fid) ;

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Rik 2017-8-5

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You might need to replace the control characters:

escaped_cellstr=app.DCMtxt.Value;
escaped_cellstr=strrep(escaped_cellstr,'%','%%');
escaped_cellstr=strrep(escaped_cellstr,'/','//');
fid = fopen('output.txt','w'); 
fprintf(fid, '%s\n',escaped_cellstr) ;
fclose(fid) ;

Walter Roberson 2017-8-5

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No, Rik, that is not needed. That would only be needed if you were using the string content inside the format. For example, the following would be a problem:

fid = fopen('output.txt','w');
for jj = 1 : size( app.DCMtxt.Value, 1 )
  fprintf( fid, app.DCMtxt.Value{jj,1} );
  fprintf( fid, '\n' );
end
fclose(fid);

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Answer 2

Will Wilson 2017-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/351473-write-multiple-line-of-text-into-a-text-file#answer_276800

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If you didn't want to use a for loop directly you could use a newer datatype called a table and one if it's helper functions to get the job done. Here is an example:

% Convert your [m x 1] cell array into a MATLAB table.
data = cell2table(app.DCMtxt.Value);
% (Optionally) name the column in your table.
data.Properties.VariableNames = {'DataSet'};
% Write the table out to a text file.
writetable(data,'OutputData');