Problems accessing files from code after moving a matlab project from uni pc to home

I am having a problem when opening files in Matlab. I am working on a course project at uni and I should use a fully working code provided by teachers and make some practice with it.

Unfortunately, after installing matlab R2022a and fixed all dependencies, after running the file

feature_extraction.m

(as sait in the instructions) I faced the following error:

Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in addi_features_from_list (line 11)
file_path = textscan(fid, '%s', 'delimiter', '\n', 'whitespace', '');

Error in feature_extraction (line 33)
[Features, file_path] = addi_features_from_list(fname_in);

Here is the code giving the error:

function [Features, file_path] = addi_features_from_list(file)  
    fprintf('File: %s \n', file); % Output: File: dat/controlled_config_1_train.dat
    fid = fopen(file, 'r');
    file_path = textscan(fid, '%s', 'delimiter', '\n', 'whitespace', '');
    file_path = file_path{1};
    N = length(file_path);
    fprintf('\nNumber of images: %d \n', N);
    Features = zeros(N, 152);
    for i = 1:N
        [~,file_name,ext] = fileparts(file_path{i});
        fprintf('process file: %s\n', [file_name ext]);
        Features(i,:) = addi_features(file_path(i));
    end
end

Here is the hirarchy of my working directory (the whole directory has been added to the path):

I also tried to see if the file exists from matlab but I always get a negative answer. Howcan i solve this?

Thanks.

PS: I am using MacOS (I also tried on Win 10)

[Walter Roberson]

You have not shown us the content of fname_in

[Bojan Poletan]

Fname_in is the same as file:

    dat/controlled_config_1_train.dat

Answer 1

[Jan]

Do not call fopen without checking for errors:

[fid, msg] = fopen(file, 'r');
assert(fid > 0, 'Cannot open file for reading: %s', file);

In the commen you mention, that file is "dat/controlled_config_1_train.dat".

The screenshot shows, that such a file does not exist, but:

dat/controlled_config_3_train.dat
%                     ^ 

[Bojan Poletan]

You are right. But this is very strange... Probably the error is somewhere else. I will contact the teacher.