Putting first line of text files in seperate rows

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Hari krishnan 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415518-putting-first-line-of-text-files-in-seperate-rows

评论： Hari krishnan 2018-8-20

Hi, i have four text files.I need to open and read first line of each text file and put each of these lines one after another in a vector. In the corresponding code shown, it just puts all the lines in a single row of the vector. Any help will be appreciated.

for ii = 1:number_of_files
    varNames = textscan(fileID, format, 1, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'TextType', 'string',  'ReturnOnError', false);
    time_start_of_experiment = [varNames{:}];
 end

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Rik 2018-8-20

You have the output as a cell, but then you convert it to a row yourself. Also you are overwriting the output every cycle of your loop. Is the varNames correct, but now you need a way to concatenate the result in a cell array?

Hari krishnan 2018-8-20

Currently when i get the output, its a string with all the first line of text files added one after the other in a row. What i need is to put the first line from each text file to seperate rows.

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Answer 1

dpb 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415518-putting-first-line-of-text-files-in-seperate-rows#answer_333423

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time_start_of_experiment = cell(number_of_files,1);
for ii = 1:number_of_files
  varNames = textscan(fileID, format, 1, 'Delimiter', delimiter, 'MultipleDelimsAsOne', true, 'TextType', 'string',  'ReturnOnError', false);
  time_start_of_experiment(ii,1) = varNames;
end

The above snippet doesn't seem correct in that it uses the same fileID for every pass through the loop; that would be reading subsequent records in the same file, not a single record in a sequence of separate files.

That would need an fopen/fclose pair inside the loop surrounding the call to textscan and an incrementing on an array of file names.