file names with a shared beginning

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Elaheh 2018-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/390473-file-names-with-a-shared-beginning

评论： Elaheh 2018-3-25

I have different files in a folder, but I want to select files such as 1_1_11.ev2, 1_2_13.ev2, with this common part "strcat(num2str(p),'_')". What should I write instead of the blank in the 3rd line after the "folderName"?

for p =1:length(directoryNames)    
    folderName = directoryNames{p};   
    Files = dir(strcat(folderName, ... )); 
end

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Rik 2018-3-24

Does something like dir(strcat(folderName,'*.ev2')); work for you? If not, you can always use a regular expression to find the file names that fit your pattern.

Image Analyst 2018-3-25

Elaheh's "Answer" moved here since it's a comment to Rik rather than an answer to the posted question.

Thank you for your comment. The point is that there are files with .ev2, which I do not need. I need only the files that have strcat(num2str(p),'_') at the beginning in common. 1_1_13.ev2, 1_2_18.ev2. etc.

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Image Analyst 2018-3-25

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You could try something like this:

for p =1:length(directoryNames)
  folderName = directoryNames{p};
  filePattern = fullfile(folderName, '*.ev2');
  for k = 1 : length(filePattern)
    thisFileName = filePattern(k).name;
    if UseThisFile(thisFileName)
      % Do something with it.
    end
  end
end

You would write a function called UseThisFile() that determines if the file is one you want to use or not based on the characters between the underlines. So that function would parse the filename and determine if it's OK to use or not and return true or false, respectively.

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Image Analyst 2018-3-25

在 MATLAB Online 中打开

Then use %s instead of %d. Try this:

for p =1:length(directoryNames)    %folders (n=12)
  folderName = directoryNames{p};
  filePattern = sprintf('%s_*.ev2', folderName);  % files in each folder
  mgdFiles = dir(fullfile(folderName, filePattern));
  for d = 1: length(mgdFiles)
    mgdFile = fullfile(folderName,  mgdFiles(d).name);
    data1 = dlmread(mgdFile);
  end
end