Not recognizing any text files in folder using dir(fullfile)

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Siobhan 2024-7-9，18:51

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编辑： Image Analyst 2024-7-9，20:51

I am trying to plot data from multiple text csv files in a folder. This is the first part of my code:

folder_path = 'C:users\power\downloads\star capillary files\';  % Replace with your folder path
% List all TXT files in the folder
txt_files = dir(fullfile(folder_path, '*.txt'));
for file_idx = 1:length(txt_files)
    filename = fullfile(folder_path, txt_files(file_idx).name);
    
    % Load the TXT file
    data = readtable(filename, 'Delimiter', ',');

MATLAB is not recognizing that there are text files in my folder, though there are. I wrote a similar code to make calculations from a single txt file in that folder and it works. Does anyone know why it might not be recognizing txt files with this code? I added the folder to path in the MATLAB software by right clicking. Any help would be extremely appreciated!

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Stephen23 2024-7-9，20:42

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"Does anyone know why it might not be recognizing txt files with this code?"

Compare:

'C:users\power\downloads\star capillary files\'  % your path
'C:\users\power\downloads\star capillary files\' % valid Windows path

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Answer 1

Voss 2024-7-9，19:33

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Try

folder_path = 'C:\users\power\downloads\star capillary files\';

instead of

folder_path = 'C:users\power\downloads\star capillary files\';

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Answer 2

Image Analyst 2024-7-9，20:50

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编辑：Image Analyst 2024-7-9，20:51

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You're missing the forward slash after the drive letter and colon. Put that in. Also, your code is not very robust. You could increase the robustness by using isfolder, like

folder_path = 'C:\users\power\downloads\star capillary files\';
if ~isfolder(folder_path)
    % Folder does not exist.  Alert user:
    errorMessage = sprintf('Error: this folder does not exist:\n"%s"\nPlease select an existing folder in the next window.', folder_path)
    uiwait(errordlg(errorMessage));
    % Ask user to pick a valid folder.
    folder_path = uigetdir();
    if folder_path == 0
        % user clicked Cancel button.
        return;
    end
    % If we get to here, then folder_path is valid.
end