How to copy a line from multiple files

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viet le 2017-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/331457-how-to-copy-a-line-from-multiple-files

编辑： Stephen23 2021-4-26

Hello everyone. I have 360 files(.o) (from test(0).o-test(360).o), as figure. I want to copy a line (red framed) and put it in the new .txt file (ordinarily from 0 to 360 means in 361 lines)

Could you guys help me how to do that.

Thank a lot.

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KSSV 2017-3-23

Is the line number always same in all the files?

viet le 2017-3-23

yes, they are totally the same

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Answer 1

Stephen23 2017-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/331457-how-to-copy-a-line-from-multiple-files#answer_259977

编辑：Stephen23 2021-4-26

在 MATLAB Online 中打开

Assuming that that line is uniquely identified by the word 'total' and the line always has the same format, then you can use fileread and regexp in a loop. Here is an outline to get you started (untested):

 P = 'dirpath';
 S = dir(fullfile(P,'*.o'));
 %S = natsortfiles(S); % optional, see comment below
 fmt = '\n\s+total\s+(\S+)\s+(\S+)';
 for k = 1:numel(S)
     F = fullfile(P,S(k).name);
     str = fileread(F);
     C = regexp(str,fmt,'tokens','once');
     vec = str2double(C)
     ..
  end