Load .dat files from subfolders with different names

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ignacio bobadilla tapia 2021-5-20

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编辑： Stephen23 2021-5-20

Hello everyone,

I have Folder1 which contains a number of subfolders with different names (subfolder_1,subfolder_th etc). Each subfolder has 7 .mat files with the same name (data1,data2,....data7). So i've got two questions:

1. Is it feasible somehow to open one subfolder at a time in a for loop in order to process tha data?

2. Is there a way to load for example data1 from all subfolders and then do the same thing for the other data?

*i guess the main problem is the subfolder's name detection and storing.

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Stephen23 2021-5-20

编辑：Stephen23 2021-5-20

"but I don't see a way to make matlab read each file in each subfolder."

outer loop that loops over the subfolders
inner loop that loops over the files
FULLFILE to construct the filenames.
pick a suitable function to import your file data: https://www.mathworks.com/help/matlab/standard-file-formats.html

ignacio bobadilla tapia 2021-5-20

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This I have so far, I don't know how to start a loop correctly so that it reads the files of interest to me.

Base = 'D:\Date';  
List = dir(fullfile(Base, '*.*));
List = List([List.isdir]);
SubFolder = {List.name};
SubFolder(ismember(SubFolder, {'.', '..'})) = [];

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Answer 1

Stephen23 2021-5-20

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编辑：Stephen23 2021-5-20

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This should get you started. Adapt to suit your data files, folder names, etc.:

P = 'absolute/relative path to where the files are saved';
n1 = 19; % number of sub-directories
n2 = 7;  % number of mat-files.
C = cell(n1,n2);
for k1 = 1:n1
    D = sprintf('subfolder_%d',k1);
    for k2 = 1:n2
        F = sprintf('data%d.mat',k2);
        C{k1,k2} = load(fullfile(P,D,F));
    end
end

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

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ignacio bobadilla tapia 2021-5-20

Dear, this code does not work for me.

Stephen23 2021-5-20

编辑：Stephen23 2021-5-20

"this code does not work for me."

I cannot help debug your code if you do not show what you tried and explain what happened when you ran it.

Did the code run without error? Did you get some results, but not the results you expected? Did the code throw any warnings? Did the code throw an error (if so, what is the complete error message?) Did the code run but not return anything? How did you check this?

If you tell us nothing, we cannot help you debug. If you tell us nothing, it slows down your work.

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Answer 2

per isakson 2021-5-20

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编辑：per isakson 2021-5-20

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Yes to both questions. With help of the code snippets below I guess you can put together a script.

sad = dir( fullfile('Folder1','**','data*.mat') );  % assuming the names starts with "data"
ffs_list = fullfile( {sad.folder}, {sad.name} );    % full file specifier 
for cac = ffs_list  % cac is a scalar cell array
    ffs = cac{1};
    % do stuff 
end

or maybe better in you case

sad = dir( fullfile('Folder1','**','data*.mat') );    % sad is a 1D struc array
for jj = 1 : length(sad)
    sad(jj).name
    sad(jj).folder
    % do stuff 
end

"I guess the main problem is the subfolder's name detection" The '**' in the dir-statement does that.

The statements

isa = ismember( {sad.name}, 'data1.mat' );
sad_data1 = sad( isa );

creates a subset containing all the files named, 'data1.mat'

The statements (assuming that the subfolder names are legal Matlab names)

cac=regexp( string({sad.folder}), '(?<=\\)\w+$', 'match' );
unique_subfolder_names = unique( horzcat( cac{:} ) );

creates a string array of unique subfolder names. To sort this array you might need Natural-Order Filename Sort by @Stephen Cobeldick

And see Auto fetch input files to process from a specified folder

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Stephen23 2021-5-20

编辑：Stephen23 2021-5-20

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Using the recursive search is a good idea, it also makes storing the data easy in the same structure:

sad(jj).data = ... whatever

Note that using DIR by itself will not return folder names subfolder 1 ... 19 in alphanumeric order.

https://www.mathworks.com/matlabcentral/answers/834733-store-txt-files-from-different-subfolders

per isakson 2021-5-20

"Note that using DIR by itself will not return folder names subfolder 1 ... 19 in" indeed it does not.

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Load .dat files from subfolders with different names

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Load .dat files from subfolders with different names

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