How to load multiple files and calculate value for each file (with same formula)

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Pasu Surananchanok
Pasu Surananchanok 2022-4-24
评论： Mathieu NOE 2022-4-25
Hello,
In case that I have the separate 123 mat files (bearing1_1_1.mat to bearing 1_1_123.mat) and I would like to calculate RMS and Crest Factor of each file (i.e., RMS for bearing1_1_1 = xxxxx, CF for bearing1_1_1 = xxxxx). How to write the code?
PS. I already have code for RMS and CF calculation but I only want how to calculate them (all 123 file) in one execution.
Because now I have to do it manually file by file and it consums lot of times (i.e., run bearing1_1_1.mat and go to next data)
Thanks for your kind supports

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回答（1 个）

Mathieu NOE
Mathieu NOE 2022-4-25
hello
this is the code (principle) to load all the mat files in a loop
% use the structure returned by DIR:
P = cd; % working directory
S = dir(fullfile(P, 'bearing*.mat'));
for k = 1:numel(S)
S(k).folder % fyi
S(k).name % fyi
F = fullfile(S(k).folder, S(k).name);
%S(k).data = load(F); % or READTABLE or whatever.
S(k).data = load(F);
end
% % structure S: it contains all of your file data and the corresponding filenames
% % For example, the 2nd filename and its data:
% S(2).name
% S(2).data
  1 个评论
Mathieu NOE
Mathieu NOE 2022-4-25
maybe you want to have the files sorted correctly and matlab is not very good for that
so in case the files are not processed in the "right" sorted manner , you may need this excellent FEX submission :
https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort
the code is now :
% use the structure returned by DIR:
P = cd; % working directory
% S = dir(fullfile(P, 'bearing*.mat'));
S = dir(fullfile(P, 'Data*.mat'));
S = natsortfiles(S); % sort folders / file names into natural order
% (download FEX : https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort)
for k = 1:numel(S)
S(k).folder % fyi
S(k).name % fyi
F = fullfile(S(k).folder, S(k).name);
%S(k).data = load(F); % or READTABLE or whatever.
S(k).data = load(F);
end
% % structure S: it contains all of your file data and the corresponding filenames
% % For example, the 2nd filename and its data:
% S(2).name
% S(2).data

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