Tell the user something is wrong

I have to ask the user to input some data so then I can show to him the image’s referring to the data he gave me however how can I write a script where I tell the user that the data he gave doesn’t exist in the images I have in my possession without appearing the error message from matlab. I think I made the question a little confusing but I hope someone understands and help me because it’s very important. Thank you!

Answer 1

[yanqi liu]

yes，sir，if check the file is or not exist，may be use

if ~exist(your_file_path, 'dir')
    error('not exist');
end

Answer 2

[Jon]

If I understand your question, I think that you may find that you can use MATLAB's errordlg function can do what you are looking for. https://www.mathworks.com/help/matlab/ref/errordlg.html

Answer 3

[Image Analyst]

To check if a folder exists, where folder is your variable name, and alert the user if the folder does not exist, use isfolder():

if ~isfolder(folder)
    errorMessage = sprintf('Error: folder does not exist:\n%s', folder);
    uiwait(errordlg(errorMessage));
    return;
end

To check if a file does not exist and alert the user if the file does not exist, use isfile():

if ~isfile(fullFileName)
    errorMessage = sprintf('Error: file does not exist:\n%s', fullFileName);
    uiwait(errordlg(errorMessage));
    return;
end