Batch file: how to access .mat files in different folders?

Question

Lisa 2014-7-17

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https://ww2.mathworks.cn/matlabcentral/answers/142222-batch-file-how-to-access-mat-files-in-different-folders

回答： hajira ashiq 2018-6-25

采纳的回答： Lisa

在 MATLAB Online 中打开

Hi all I want to write a batch file.

The code should access .mat files in different folders (which are located in one joint folder). All .mat files have the same names.
Then the data should be processed.

The second step is clear. However, I have problems accessing the .mat files in the different folders. Below is what I have so far. Could you support me to solve this issue?

Thank you in advance. Lisa

----------------------------------
d = dir('C:\Users\lisa\Documents\DATA\');
isub = [d(:).isdir];
FileList = d('*_stroop_MES_Probe1.mat');
N = size(FileList,1);
for k = 1:N
% get the file name:
  filename = FileList(k).name
  disp(filename);
%     nirs_data = load('-mat');
% insert your script code here:
  importfile(filename)
  A=(nirs_data.oxyData(:,:))
  x=nirs_data.vector_onset(:,:)
..........
end
------------------------------------------------

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Answer 1

Lisa 2014-7-17

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Hi

Finally solved it using this thread: http://www.mathworks.com/matlabcentral/answers/119267-read-png-from-different-subfolder

thanks again for giving me the hint. lisa

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Matz Johansson Bergström 2014-7-17

Ah, I just uploaded my answer, too bad.

Image Analyst 2014-7-27

Lisa, even though you can only "Accept" one answer, you can still "Vote" for his answer to give him reputation points.

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Answer 2

Matz Johansson Bergström 2014-7-17

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I would suggest that you use dir with the argument '*_stroop_MES_Probe1.mat' directly instead of picking from d.

For instance, I wrote d = dir('test*.mat');

m

>> d.name

ans =

test.mat

ans =

test2.mat

That is, all the mat-files beginning with the string "test". You could use regexp, but I believe that is overkill in this case.

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Answer 3

Matz Johansson Bergström 2014-7-17

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编辑：Matz Johansson Bergström 2014-7-17

在 MATLAB Online 中打开

I assume that all your .mat files are at a certain level (one "folder" down) in the file tree. This could be modified to suit your needs, I only print out the file names to show how it can be done.

d = dir('.');
directories = dir(str);
%go through all dirs
for i = 3:length(directories) %ignore . and ..
      current_dir = directories(i);
      if (current_dir.isdir)
          cd(current_dir.name); %move to this directory and list all files
          fprintf(1, ' Stepped into directory %s/\n', current_dir.name)
          d = dir('g*.m'); %list all .m files starting with g
          for i = 1:length(d)
              fprintf(1, 'Found the file %s\n', d(i).name)
          end
          %disp('moving up')
          cd('..') %go back up
      end
  end

This code will print out the directories it visits and print the file names matching a criteria.

I hope this helps.

And don't write a new "answer" for a response, instead give comments on my answer, please.

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Answer 4

Lisa 2014-7-17

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Hi

Thank you for your answer. I tested your suggestion. It only finds the files in the dir folder.

However, this doesn't find the specified .mat files in the subfolders. How can we access those?

thanks Lisa

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Matz Johansson Bergström 2014-7-17

I would access each directory in my pwd and simply loop through those. You can do this to a certain "depth" of your file tree. If you do not know how deep your file tree is, you could resursively step through all directories and find all files in that way. I found something that might help: http://www.mathworks.se/matlabcentral/fileexchange/19550-recursive-directory-listing

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Answer 5

Lisa 2014-7-17

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Hi Thanks, great, yes I see the files now. I would need one last help in creating a filelist. Something like:

fileList=('*_stroop_MES_Probe1.mat') % to access those .mat file specifically

I stuck here. best Lisa

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Answer 6

hajira ashiq 2018-6-25

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aoa everyone . i need a sample code that calls or aces files which are in different folder . when i run this file ... the inner all files are sequentialy runs