How do I load multiple .mat files and save them as variables?

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Paul 2022-9-2

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编辑： Stephen23 2022-9-2

So I'm trying to load multiple .mat files into matlab. In the current folder, my .mat files are named "test1.mat" to "test2036.mat", so 36 test cases in total.

Can I have some help in importing all of the test cases and saving as variables such as "test1Data", "test2Data" etc.

Anyhelp is much appreciated! Thanks :)

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Stephen23 2022-9-2

编辑：Stephen23 2022-9-2

"...and saving as variables such as "test1Data", "test2Data" etc."

Best avoided:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

"...my .mat files are named "test1.mat" to "test2036.mat", so 36 test cases in total."

From 1 to 2036 gives ... 2036 test cases. Or can multiple files correspond to one test case?

Paul 2022-9-2

Thanks for your quick response, I made an error in the original question, it shouldn't read test2036.mat but just test36.mat

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Answer 1

Stephen23 2022-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/1793485-how-do-i-load-multiple-mat-files-and-save-them-as-variables#answer_1040515

编辑：Stephen23 2022-9-2

在 MATLAB Online 中打开

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

P = '.'; % absolute or relative path to where the files are saved.
S = dir(fullfile(P,'test*.mat'));
for k = 1:numel(S)
    F = fullfile(P,S(k).name);
    C = struct2cell(load(F));
    S(k).data = C{1}; % assuming exactly one variable per file, which
end                   % is important information you did not tell us.

Your file data will be stored in the structure array S. You can trivially loop over all of S to process the imported data.

For example the second file name and its corresponding data:

S(2).name
S(2).data

You can also use the following convenience syntax to access the field data of S:

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

If you expect those files to be listed in alphanumeric order, you can download and use this:

https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

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