After creating a new GUI with a “Push Button” and a “List Box” using Guide, in the “.m” file generated by GUIDE, make the following changes to the function named “pushbutton1_Callback”:
function pushbutton1_Callback(hobject, eventdata, handles)
% hobject handle to pushbutton1 (see GCBO)
% eventdata reserved to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% "uigetfile" function lets the user select a text file
[file, path] = uigetfile('*.txt', 'Select a Text File');
% Check if user canceled
if isequal(file, 0)
errordlg('No file selected!', 'File Error');
return;
end
% Read the file data
filename = fullfile(path, file);
fileData = load(filename);
% Check if data is numeric and in two columns
if ~isnumeric(fileData) || size(fileData, 2) ~= 2
errordlg('File must contain numeric data with two columns!', 'Data Error');
return;
end
% Format data as two columns for ListBox
% This loops through the data row by row, using
%sprintf to create a string with spacing between columns
formattedData = cell(size(fileData, 1), 1);
for i = 1:size(fileData, 1)
formattedData{i} = sprintf('%d %d', fileData(i, 1), fileData(i, 2));
end
% "set" updates the ListBox to display the formatted content
set(handles.listbox1, 'String', formattedData);
Save the “.fig” and “.m’ files and run to test the functionality. Also, here, it is assumed that the text file contains the numeric data in two columns only, like:
123 456
897 127
164 865
For more information on the “uigetfile” and “set” function, refer to the following documentations:
As GUIDE has been deprecated from MATLAB R2021a, it is recommended to use App Designer for the latest releases.
Hope this helps!
