Load files from two different folders

Hi,

I need to upload files from two different folders. I wrote this but it woking just from one folder. How can I add the second folder?

dirname=['D:\Shared\MATLAB\100min\BT']

cd(dirname)

filelist = dir([basename '*_BTlength.mat'])

Thanks

Answer 1

[Stephen23]

Do NOT use ADDPATH or CD or any other messing around with the MATLAB search path just for acessing data files.

All MATLAB functions which import/export data files accept relative/absolute filenames. Using relative/absolute filenames is more robust, more efficient, and easier to debug than messing around with CD or the search path. You should use relative/absolute filenames.

For example:

P = 'D:\Shared\MATLAB\100min\BT'; % got rid of the superfluous square brackets.
S = dir(fullfile(P,'*_BTlength.mat'));
for k = 1:numel(S)
    F = fullfile(S(k).folder,S(k).name);
    % do whatever you want with absolute filename F, e.g.:
    D = load(F)
end

See also:

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

https://www.mathworks.com/help/matlab/ref/fullfile.html

[Paola]

Thanks but it still taking the files from one folder

P = 'D:\Shared\MATLAB\100min\BT

I would like to add another folder

P2 = 'D:\Shared\MATLAB\100min-rep2\BT

[Stephen23]

"I would like to add another folder"

It is easy to specify two paths, e.g.:

P1 = 'D:\Shared\MATLAB\100min\BT';
P2 = 'D:\Shared\MATLAB\100min-rep2\BT';
S = [...
    dir(fullfile(P1,'*_BTlength.mat'));...
    dir(fullfile(P2,'*_BTlength.mat'))];
for k = 1:numel(S)
    F = fullfile(S(k).folder,S(k).name);
    % do whatever you want with absolute filename F, e.g.:
    D = load(F)
end

Alternatively you can use wildcards in the path name as well, e.g.:

P = 'D:\Shared\MATLAB\100min*\BT';
S = dir(fullfile(P,'*_BTlength.mat'));
for k = 1:numel(S)
    F = fullfile(S(k).folder,S(k).name);
    % do whatever you want with absolute filename F, e.g.:
    D = load(F)
end

[Paola]

Thanks, I was not able to find the error. it works now

Answer 2

[Jacob Ward]

Use the addpath() function to add the path to your second folder to the working directory:

Add folders to search path - MATLAB addpath (mathworks.com)