Import files from two folders

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Vlatko Milic
Vlatko Milic on 7 Dec 2021
Commented: Vlatko Milic on 8 Dec 2021
I am trying to import files from two different folders, including each file name. I manage to import the files from the first folder but I have problems when I come to the second folder.I get the error: "Undefined function 'Importing' for input arguments of type 'cell'.My code looks as follows:
path1 = 'files1';
subfolderInfo = dir(path1);
subfolderNames = {};
for b = 1: Num1
[X1,X2] = PImport(b,subfolderNames);
%in this folder I get the problem...
path2 = 'files2';
subfolderInfo = dir(path2);
subfolderNames = {};
for c = 1: Num2
[Z1] = ImportingEl(c,subfolderNames);
I don't know if it the connected to the use of "subfolderNames" twice. However, I have tried changing it to "SubfolderNames2" but that does not work either. Furthermore, the code within each for loop is as follows:
cd 'files1';
fileInfo = dir(subfolderNames{v});
fileNames = {};
ImportedData = readtable(char(fullfile(fileInfo(1).folder,fileNames(1))));
Data = table2array(ImportedData(:,2));
Thank you in advance!
  1 Comment
Jan on 7 Dec 2021
A simplification: If you access a cell string with curly braces, you can omit the conversion by CHAR():
% ImportedData = readtable(char(fullfile(fileInfo(1).folder,fileNames(1))));
ImportedData = readtable(fullfile(fileInfo(1).folder, fileNames{1}));

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Accepted Answer

Jan on 7 Dec 2021
The error message is clear:
Undefined function 'Importing'
This means, that this function is not visible. If it was working before, I guess it is stored in a folder, which was the current folder, but then the current folder was changed by a cd() command.
Store functions in folders, which are included in Matlab's path. See:
doc addpath
doc savepath
doc pathtool
Do not change the current directory. Remember than callbacks of timers of GUIs might call CD also at unexpected situations. Prefer working with absolute paths in every case. Replace
cd 'files1';
fileInfo = dir(subfolderNames{v});
fileInfo = dir(fullfile('files1', subfolderNames{v}));
But even here 'files1' is a relative path. Better: 'D:\Your\Folder\files1'.
Vlatko Milic
Vlatko Milic on 8 Dec 2021
I solved it by myself, thank you Jan!

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