Issue with for loop, finding file in directory
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Hi,
I'm having a problem with the code below. dirNames is a 1x14 with the names of folders with csv files in them that I need to perform calculations on. The first for loop loops through the folders. The second for loop is to loop inside each folder to read the required files. I have left out the remaining code as that part it fine.
My issue is that S is 0 (see below), and I cannot get my head around the issue.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1021855/image.png)
I would appreciate any help.
for a = 1 : length(dirNames)
fileDir = char(dirNames(a));
S = dir(fullfile(fileDir,'sheet*.csv')); % get list of data files in directory according to name structure
S = natsortfiles(S);
% Loop inside folder
for k = 1:length(S) % read data in specified sheet
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Voss
le 4 Juin 2022
Modifié(e) : Voss
le 4 Juin 2022
You mention the file "data_1" in a comment here:
which makes me think possibly your files are called data_1, data_2, etc., rather than sheet*whatever.csv. If that's true, then try using data_*.csv in fullfile instead of sheet*.csv to get the set of file names to read:
for a = 1 : length(dirNames)
fileDir = char(dirNames(a));
S = dir(fullfile(fileDir,'data_*.csv'));
S = natsortfiles(S);
% Loop inside folder
for k = 1:length(S) % read data in specified sheet
On the other hand, if the files are called file1.csv, file2.csv, etc., as is stated in the question itself:
Then you should use file*.csv in fullfile:
for a = 1 : length(dirNames)
fileDir = char(dirNames(a));
S = dir(fullfile(fileDir,'file*.csv'));
S = natsortfiles(S);
% Loop inside folder
for k = 1:length(S) % read data in specified sheet
The point is, you have to give fullfile the wild-card pattern that actually matches your file names.
By the way, S is not 0; it is an empty struct array (of size 0-by-1).
By the way again, you can use curly braces { } to index dirNames:
fileDir = dirNames{a};
and avoid the explicit call to char, regardless of whether dirNames is a cell array of character vectors a string array.
4 commentaires
Voss
le 4 Juin 2022
I should have said, "Check that the directory whose name is given by the value of fileDir exists, and that this directory contains the files."
What did you find when you set the breakpoint in the code and did the checks I suggested?
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