file path error in matlab

Question

ali hassan 2022-1-26

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评论： Image Analyst 2022-1-27

when i am running a command in matlab, it says:

>> a=readtable('111..txt','PreserveVariableNames',true)
Error using readtable
Unable to find or open '111..txt'. Check the path and filename or file permissions.

but once i change the path, problem is resolved. can my code not work with any path? because i am making a GUI and i want it to run the command,nomatter where the path is

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Answer 1

Image Analyst 2022-1-26

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It will work with any path as long as that file exists, which yours does not. Are you sure it has two dots in it? That would be unusual. Try this:

fullFileName = fullfile(pwd, '111..txt')
if ~isfile(fullFileName)
    warningMessage = sprintf('File not found:\n%s\n\nOn the next screen, select a file.', fullFileName)
    uiwait(warndlg(warningMessage))
    % Have user browse for a file, from a specified "starting folder."
    % For convenience in browsing, set a starting folder from which to browse.
    startingFolder = pwd;  % or 'C:\wherever';
    if ~isfolder(startingFolder)
        % If that folder doesn't exist, just start in the current folder.
        startingFolder = pwd;
    end
    % Get the name of the file that the user wants to use.
    defaultFileName = fullfile(startingFolder, '*.*');
    [baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
    if baseFileName == 0
        % User clicked the Cancel button.
        return;
    end
    fullFileName = fullfile(folder, baseFileName)
end
t = readtable('111..txt','PreserveVariableNames',true)

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ali hassan 2022-1-27

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i tried this but it is giving this error.

Error using readtable (line 318)
Unable to find or open '111..txt'. Check the path and filename or file permissions.

Image Analyst 2022-1-27

在 MATLAB Online 中打开

Sorry, it should use fullFileName in readtable(), not the hard coded filename.

fullFileName = fullfile(pwd, '111..txt')
if ~isfile(fullFileName)
    warningMessage = sprintf('File not found:\n%s\n\nOn the next screen, select a file.', fullFileName)
    uiwait(warndlg(warningMessage))
    % Have user browse for a file, from a specified "starting folder."
    % For convenience in browsing, set a starting folder from which to browse.
    startingFolder = pwd;  % or 'C:\wherever';
    if ~isfolder(startingFolder)
        % If that folder doesn't exist, just start in the current folder.
        startingFolder = pwd;
    end
    % Get the name of the file that the user wants to use.
    defaultFileName = fullfile(startingFolder, '*.*');
    [baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
    if baseFileName == 0
        % User clicked the Cancel button.
        return;
    end
    fullFileName = fullfile(folder, baseFileName)
end
t = readtable(fullFileName,'PreserveVariableNames',true)