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How to save different mat files from different folders in a cell array

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Hi friends,
I have 51 folders named with (copy_1, copy_2, copy_3 ..... copy_51). Each folder of these has 25 matfiles (X1, X2,X3...X25).
1- I want to concatenate all the matflies (25 matfiles) from each folder (51 folders) in cell array. The output cell will be (1275 * 1). I just want to save them like the attached picture.
i have tried this code, but it does not help me.
D = 'path to the folder where the files are saved'
S = dir(fullfile(D,'X*.mat'));
C = cell(1,numel(S));
Z = load(fullfile(D,S(1).name));
F = fieldnames(T);
for k = 2:numel(S)
T = load(fullfile(D,S(k).name));
for n = 1:numel(F)
Z.(F{n}) = cat(1, Z.(F{n}), T.(F{n}));
end
end
save(fullfile(D,'Y.mat'),'Z')
....
Any help will be highly appreciated .

Accepted Answer

Mohith Kulkarni
Mohith Kulkarni on 27 Nov 2020
If the goal is to store each mat file in a separate cell with the data of the variables each of the mat files concatenated into one cell, refer to the code below:
projectdir = '.'; %or name of containing folder
foldinfo = dinfo(projectdir);
foldinfo(~[foldinfo.isfolder]) = []; %get rid of non-folders
foldinfo(ismember({foldinfo.name}, {'.', '..'})) = []; %get rid of . and .. folders
foldnames = fullfile(projectdir, {foldinfo.name});
numfold = length(foldnames);
out = cell(1275,1); % initialize the empty cell array.
for D = 1 : numfold
thisfold = foldnames{D};
dinfo = dir( fullfile(thisfold, '*.mat'));
filenames = fullfile(thisfold, {dinfo.name});
numfile = length(filenames);
for F = 1 : numfile
thisfile = filenames{F};
file_struct = load(thisfile);
%now extract variables from file_struct and process them
for n = 1:numel(thisfile)
out{(D-1)*25 + F,1} = cat(1,out{D*F},file_struct.(thisfile{n}));
end
end
end

  4 Comments

Show 1 older comment
Abdulhakim  Alezzi
Abdulhakim Alezzi on 28 Nov 2020
I got this error
Brace indexing is not supported for variables of this type.
out{(D-1)*25 + F,1} = cat(1,out{D*F},file struct.(thisfile{n}));
Mohith Kulkarni
Mohith Kulkarni on 30 Nov 2020
Try the following instead as the data is being copied from each variable of the mat file, "fieldnames" is used to access the variables :
for D = 1 : numfold
thisfold = foldnames{D};
dinfo = dir( fullfile(thisfold, '*.mat'));
filenames = fullfile(thisfold, {dinfo.name});
numfile = length(filenames);
for F = 1 : numfile
thisfile = filenames{F};
file_struct = load(thisfile);
%now extract variables from file_struct and process them
Fields = fieldnames(file_struct);
for n = 1:numel(Fields)
out{(D-1)*25 + F,1} = cat(1,out{(D-1)*25 +F,1},file_struct.(Fields{n}));
end
end
end

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