How to concatenate multiple .mat files and generate a 3D matrix?

Question

Andres Ulloa 2022-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/1772980-how-to-concatenate-multiple-mat-files-and-generate-a-3d-matrix

评论： Andres Ulloa 2022-8-3

I have 100 files which are 30482x43 (number of data x layers), and what I am trying to do is make a single 30482x100x43 matrix.

I would appreciate your help please!!

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Walter Roberson 2022-8-3

Please see http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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Answer 1

Stephen23 2022-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/1772980-how-to-concatenate-multiple-mat-files-and-generate-a-3d-matrix#answer_1020230

编辑：Stephen23 2022-8-3

在 MATLAB Online 中打开

"I have 100 files ..."

which are probably named using some sequential numbering, so you will need to take that into account in the code:

P = 'absolute or relative path to where the files are saved';
S = dir(fullfile(P,'*.mat'));
S = natsortfiles(S); % download: https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort
for k = 1:numel(S)
    F = fullfile(P,S(k).name);
    L = load(F);
    S(k).data = L.nameOfTheVariableWhichYouDidNotTellUs;
end
A = permute(cat(3,S.data),[1,3,2]);

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Andres Ulloa 2022-8-3

thank you so much you helped me a lot!!

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Answer 2

KSSV 2022-8-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772980-how-to-concatenate-multiple-mat-files-and-generate-a-3d-matrix#answer_1020205

在 MATLAB Online 中打开

matFiles = dir('*.mat') ; 
N = length(matFiles) ; 
iwant = zeros(3048,43,N) ;
for i = 1:N
    S = matfile(matFiles(i).name) ;
    iwant(:,:,i) = S.myvar ;    % myvar is the variable in your mat file 
end