Loading variables from different folders containing subfolders in loop
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Hello,
I have 39 folders, each of them containing 6 subfolders with mat files inside in the form of a matrix mxn. From the matfiles, I need to load the matrices with the lowest n of zeros in a loop and save them in a mat.file in the workspace so that those can be loaded when it is necessary to save variables in them.
Any suggestion on how to do that?
Thank you!
4 个评论
Use DIR with the '**' syntax to get a structure of all of the files:
Loop over that structure. Perform whatever check or comparison you need inside the loop.
Eleonora Montagnani
2022-1-20
@Eleonora Montagnani: it sounds like you probably just need to store the imported data in an array. One approach is to use a cell array, as shown in the MATLAB documentation:
Another simple and versatile approach is to use the structure returned by DIR:
P = 'absolute or relative path to the root directory',
S = dir(fullfile(P,'**','*.mat'));
for k = 1:numel(S)
F = fullfile(S(k).folder,S(k).name);
D = load(F);
.. decide what data you want to store
S(k).somedata = whatever_you_want_to_store;
S(k).otherdata = something_else;
end
Then you can use another loop to compare those matrices and perform your analyses.
Eleonora Montagnani
2022-1-20
采纳的回答
Mathieu NOE
2022-1-20
hello
an example below to show how to loop over directories and load in natural sorting ordre the files in each folder
clc
clearvars
%% define path
yourpath = pwd; % or your specific path
list=dir(yourpath); %get info of files/folders in current directory
isfile=~[list.isdir]; %determine index of files vs folders
dirnames={list([list.isdir]).name}; % directories names (including . and ..)
dirnames=dirnames(~(strcmp('.',dirnames)|strcmp('..',dirnames))); % remove . and .. directories names from list
%% demo for excel files
sheet = 1; % specify which sheet to be processed (my demo) - if needed
%% Loop on each folder
for ci = 1:length(dirnames) %
fileDir = char(dirnames(ci)); % current directory name
S = dir(fullfile(fileDir,'Sheeta*.xlsx')); % get list of data files in directory according to name structure 'Sheeta*.xlsx'
S = natsortfiles(S); % sort file names into natural order (what matlab does not) , see FEX :
%(https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort)
%% Loop inside folder
for k = 1:length(S) % read data in specified sheet
data = xlsread(fullfile(fileDir, S(k).name),sheet); % or use a structure (S(k).data ) to store the full data structure
% your own code here for data processing. this is just for my demo
% for now :
title_str = [fileDir ' / ' S(k).name ' / sheet : ' num2str(sheet)];
figure,plot(data),title(title_str);
end
end
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