MATLAB: How can i load .mat files from subfolders with for loop

Question

I have a different number of .mat files in several folders, which I would like to import, plot data und save it in the same folder as a pdf file.

Here an example with two folders:

C:\Users\I2d1_4_1_1\

y3.mat

y4.mat

y5.mat

C:\Users\I5d1_4_1_1\

y3.mat

y4.mat

y5.mat

y6.mat

My two questions are:

1. How do i save it in the same folder without changing the directory.
2. How to adapt the code that i dont need to change the for loop i=3:5 for the first folder and i=3:6 for the second folder.

DataPath ='C:\Users\';
for i=3:60 
for input=[2 5 8]
for delay=[4 8 12];
for delayinput=[1 4 8];               
    load([DataPath 'I%dd1_%d_1_%d\y' num2str(i) '.mat',input,delay,delayinput])   
figure(1), plotregression(x, y); 
SaveName = sprintf('NN_%d_1_%d',i,delay);
saveas(figure(1),fullfile(DataPath 'I%dd1_%d_1_%d', SaveName),'pdf')
end
end
end
end

Thanks for your help.

Answer 1

projectdir = 'C:\Users';
foldinfo = dir( fullfile(projectdir, 'I*') );
foldinfo(~[foldinfo.isdir]) = [];   %get rid of I* that are not folders
foldnames = fullfile(projectdir, {foldinfo.name});
numfold = length(foldnames);
for didx = 1 : numfold
    thisfold = foldnames{didx};
    dinfo = dir(fullfile(thisfold, 'y*.mat'));
    filenames = fullfile(thisfold, {dinfo.name});
    numfiles = length(filenames);
    for fidx = 1 : numfiles
        thisfile = filenames{fidx};
        datastruct = load(thisfile);
        x = datastruct.x; y = datastruct.y;
        and do your thing
    end
end