Loop Files from a Directory

Hi, I want to loop files in a folder. I used the following method:

 datadirs = dir('../Inputdata/URL2'); 

 dircell = struct2cell(datadirs)' ;   

 filenames = dircell(:,1);

 datafilename =strcat('../Inputdata/URL2/',filenames(3)); %just a try.

 fid = fopen(datafilename);

It gives me an error message.

But when I used:

ff =  '../Inputdata/URL2/2017032312_8952.txt'; %(The same as the "datafiename").

fid = fopen(ff);

It worked.

WHY!!!

How to fix the problem?

[KSSV]

What files you want to open in a folder? Do they have any extension?

[Stephen23]

@Qingsheng Bai: instead of making up your own complicated and buggy syntax, you would be much better off simply copying the examples shown in the MATLAB documentation:

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

or from here:

https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files

And to build the path strings you should definitely use fullfile instead of strcat.

[KL]

Valid point Stephen. Edited my answer.

Answer 1

[KL]

Change

datafilename =strcat('../Inputdata/URL2/',filenames(3));

to

datafilename =fullfile('../Inputdata/URL2',filenames{3});

and if you're only playing with txt files, then why not

datadirs = dir('../Inputdata/URL2/*.txt');

[Qingsheng Bai]

That what I need. Thanks!