How can I save matrix to .txt, .xslx, and .pdf file selectable by the user using dialog box in App Designer?

I try to figure out to save my output files from App Designer to .txt or excel or .pdf format which should be selectable by the user via a file saving dialog box.

I run the below code when only "writetable" is accessible and I get the .txt file successfully.

Likewise, when only "xlswrite" or "publish" is accessible then I get an excel file successfully.

But I need to make it selectable. How can I fix it?

function RelativeErrorButtonPushed(app, event)

            filter = {'*.txt', 'Text File'; ...
                '*.xslx', 'XSLX File'; ...
                '*.pdf', 'PDF Document';...
                '*.*', 'All Files'};
            [file, path] = uiputfile(filter, 'File Selection', 'Error_Percent');
            app.filename = fullfile(path, file);
            assignin ("base","filter",filter);
            %             Create variable names
            Head1 = app.Error_Percent(:,1);
            Head2 = app.Error_Percent(:,2);
            Head3 = app.Error_Percent(:,3);
            Head4 = app.Error_Percent(:,4);
            Head5 = app.Error_Percent(:,5);
            
            % Create a table with the data and variable names
                        T = table(Head1, Head2, Head3, Head4, Head5, app.Error_Percent);
                        % Write data to text file
                        writetable(T,app.filename,'Delimiter', ' ', "Encoding", 'UTF-8');

            %             xlswrite(app.filename, app.Error_Percent);
            %              publish(app.filename, app.Error_Percent);
            
        end

Answer 1

[Ishaan Mehta]

Hi Nimet

As I understand, you wish to allow the user to pick out a specific format for export, from a list of allowed options. This is a typical use-case for creating a dropdown in the MATLAB App Designer UI. You can add a dropdown through the "uidropdown" component.

Simply drag a "Drop Down" component from the "Component Library" panel, and add various options like "TXT", "XLS", "PDF", etc. as required.

Now, add a "Button" component, and in the button's "ButtonPushedFcn" callback, define the logic to check for the "app.DropDown.Value" (assuming the dropdown component is "app.DropDown") and use an if-else block or a "switch-case" statement to call the export logic according to the option selected by the user.

With this done, the user interface should look something like this:

For more information about the "drop-down" component, refer to:

uidropdown: https://www.mathworks.com/help/matlab/ref/uidropdown.html

Hope this helps!