Trying to delete lines that start with an alphabet on a text file

Question

mt 2014-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/159312-trying-to-delete-lines-that-start-with-an-alphabet-on-a-text-file

编辑： Guillaume 2014-10-20

Hi folks,

I have a huge textfile right here with around 100k lines and I am trying to delete all the lines that start with an alphabet (not deleting the ones that start with numbers). Can anybody help? I am having trouble structuring the m file.

Thanks.

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Answer 1

Guillaume 2014-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/159312-trying-to-delete-lines-that-start-with-an-alphabet-on-a-text-file#answer_155834

编辑：Guillaume 2014-10-20

在 MATLAB Online 中打开

Use fopen, fgetl, fclose to read your file into a cell array and discard the lines you don't want. Or if you want to write a new file, use fopen, fprintf, fclose and write as your read:

fidi = fopen('somefile.txt', 'rt');
fido = fopen('newfile.txt', 'wt');
tline = fgetl(fidi);
while ischar(tline)
  if ~isempty(tline) && tline(1) >= '0' && tline(1) <= '9'
    %line to keep
    fprintf(fido, '%s\n', tline);
  end
  tline = fgetl(fidi);
end
fclose(fidi);
fclose(fido);