Applying a single function to many files in one folder.

Hello,

I am trying to apply a function to many files in a single folder. I assume I need to use a loop to go through the folder and process the files, but Im not certain which command recalls said folder. Once the data has been moved through, I want the refined data to be stored into a separate folder (we'll call this Folder B). I then want to run a function which goes through Folder B and applies commands such as mean/standard deviation of the data.

[Jan]

Note, that "apply a function to many files" is not clear. Are the files M-files, test files, data stored in MAT or Excel-Files?

[Patrick Scarff]

Apologies-They are csv files.

[Stephen23]

Pick a suitable function for your file format (e.g. REDATABLE or READMATRIX) and follow the examples in the documentation:

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

Answer 1

[Jan]

See: FAQ: How to process a sequence of files

FolderIn  = 'D:\Your\Folder';
FolderOut = 'D:\Your\B'
FileList  = dir(fullfile(Folder, '*.mat');
for iFile = 1:numel(FileList)
   File = fullfile(Folder, FileList(iFile).name);
   Data = load(File);
   % Now do what you want with the data
   NewData = Data;
   save(fullfile(FolderOut, FileList(iFile).name), 'NewData', '-struct');
end