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loading multiple csv files using readmatrix

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julian gaviria
julian gaviria am 19 Okt. 2023
Bearbeitet: Stephen23 am 19 Okt. 2023
How can I load to matlab workspace multiple matrices with the same dimension located in individual csv files? They have different file names with the same extension (.csv)
Expected variable in workspace: A 3D matrix.
I have tried something like
Folder = 'C:\My\Folder';';
for k = 1 :100
filename = fullfile(Folder, sprintf('%d.csv', k));
data = readmatrix(filename);
...
end
  3 Kommentare
Dyuman Joshi
Dyuman Joshi am 19 Okt. 2023
@julian gaviria, Does the folder containing the csv files have any other files than the ones to be read?
julian gaviria
julian gaviria am 19 Okt. 2023
@Dyuman Joshi, no. there is only 1 sheet per .csv file. All the .csv files contain a 2D matrix with the same dimension

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Stephen23
Stephen23 am 19 Okt. 2023
Use DIR:
P = 'C:\My\Folder';
S = dir(fullfile(P,'*.csv'));
for k = 1:numel(S)
F = fullfile(P,S(k).name);
S(k).data = readmatrix(F);
end
All of the imported file data are stored in the structure S. For example, the 2nd file:
S(2).name % filename
S(2).data % file data
  2 Kommentare
julian gaviria
julian gaviria am 19 Okt. 2023
Thanks @Stephen23
How can I arrange all the content of "S(2).data" in a 3D array?
Stephen23
Stephen23 am 19 Okt. 2023
Bearbeitet: Stephen23 am 19 Okt. 2023
"How can I arrange all the content of "S(2).data" in a 3D array? "
A = cat(3,S.data)
But note that the order of the files will be that returned by DIR, which might not be the order you expect. If you require the filenames in alpha-numerical order then you will have to sort S yourself, e.g. by downloading NATSORTFILES:
S = dir(..);
S = natsortfiles(S);
... etc

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Sulaymon Eshkabilov
Sulaymon Eshkabilov am 19 Okt. 2023
Here is how you can create such a code:
Folder = 'C:\Users\...';
F_Pat = fullfile(Folder, '*.csv');
FILES = dir(F_Pat);
F_Names={FILES.name};
for k = 1 :length(F_Names)
Get_FName = FILES(k).name;
F_FileName=fullfile(FILES(k).folder, Get_FName);
data{k}= readmatrix(F_FileName);
...
end
All the best
  1 Kommentar
Sulaymon Eshkabilov
Sulaymon Eshkabilov am 19 Okt. 2023
My proposed code works for any file names not necessary file names should be sequential. All collected data in a cell array that can be also altered to store read data as a structure or stacked data of arrays, etc.

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R2023b

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