How to automate .mat file loading

Question

Hugo 2022-2-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1642135-how-to-automate-mat-file-loading

编辑： Image Analyst 2022-2-4

Hi,

I have a MATLAB code in which I import a .mat file and select columns. The .mat file is called A.mat. I have 5 .mat files: A.mat, B.mat, C.mat, D.mat and E.mat. Is there a way to automate the code, so it can repeat every code instruction, importing the 5 .mat files by alphabetical order?

Thank you,

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ali hassan 2022-2-3

编辑：Image Analyst 2022-2-4

在 MATLAB Online 中打开

Yes you can simply load them at the start.

https://www.mathworks.com/matlabcentral/answers/415527-loading-multiple-non-sequential-mat-files-to-automate-a-code?s_tid=answers_rc1-2_p2_MLT

 listoffiles = dir('D:\Data\**\*.mat')
 for k = 1 : length(listoffiles)
      CurFile = listoffiles(k)
      load(fullfile(CurFile.folder, CurFile.name))
 end

This gets you a list of all the files ending in .mat (change if your data has a different extension) (in subfolders of Data too) and then loads them into MATLAB. Also replace the "D:\Data" with the actual path-name of your main folder.

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Answer 1

Stephen23 2022-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1642135-how-to-automate-mat-file-loading#answer_888010

编辑：Stephen23 2022-2-3

在 MATLAB Online 中打开

You can use the approaches shown in the documentation:

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

For example, using DIR:

P = 'absolute or relative path to where the files are saved';
S = dir(fullfile(P,'*.mat'));
for k = 1:numel(S)
    F = fullfile(P,S(k).name);
    D = load(F)
    ... do whatever with D
end