How to change the directory in the middle of a code

Question

Homayoon 2015-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/238098-how-to-change-the-directory-in-the-middle-of-a-code

编辑： Walter Roberson 2015-8-31

Dear All MATLAB Users :-)

I have a critical question whose answer will save much time for me. Well basically the answer to my question will increase my ability of running as many as calculations I need during my sleep hours :-)

Assume on my desktop I have 4 folders ( directories ). Each of them is containing of many text files. The names of these directories are 1,2,3 and 4 respectively.

Now I have a code (m-file) located in each of these sub directories. Obviously once the code is run, all calculation will be performed on the files within that directory. What I basically seek for is a way to change the directory address after calculations for the files located in folder 1 finish. As a result, by running my code once, all of the folders will be covered one after another.

    % THE CODE START RUNNING WITHIN THE DIRECTORY 1 
    for k = 1:50   % NUMBER OF TEXT FILES IN THE FIRST DIRECTORY
    filename = sprintf('%d.txt',k);
    A = load(filename); 
    % doing some calculations
    print the output for k.txt
    end
    % THIS IS WHAT i WANT : Change the directory to the second one and again start running the code for the text files in the second folder.
     for k = 1:10
    filename = sprintf('%d.txt',k);
    A = load(filename); 
    % doing some calculations
    print the output for k.txt
    end

Thank you in advanced. Best, HRJ

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Answer 1

Image Analyst 2015-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/238098-how-to-change-the-directory-in-the-middle-of-a-code#answer_190790

在 MATLAB Online 中打开

Try it this way:

topLevelFolder = 'C:/myData/whatever'; % Forward slashes works with Windows too!
for f = 1 : 4
  % Get the name of this folder.
  thisFolder = sprintf('topLevelFolder/%d', f);
  % See if it actually exists
  if ~isdir(thisFolder)
    errorMessage = sprintf('Error: The following folder does not exist:\n%s', thisFolder);
    uiwait(warndlg(errorMessage));
    continue;
  end
  % Get a list of the .mat files in thisFolder.
  filePattern = fullfile(thisFolder, '*.mat');
  matFiles = dir(filePattern);
  for k = 1:length(matFiles)
    baseFileName = matFiles(k).name;
    fullFileName = fullfile(thisFolder, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    % Read it in
    storedStructure = load(fullFileName); 
    % Do some operations.
  end
end