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

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

[Stephen23]

"How to write the code?"

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

Answer 1

[Mathieu NOE]

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

[Mathieu NOE]

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