Why do I receive "Too many arguments" error when trying to export data from an app designer table as a .txt file, to a user defined file location?

I am attempting to write data from an app designer table, to a .txt file, which can then be saved to a user-specified file location at the touch of a button. It should be noted that the table is quite large, with a length of 16,420 values, so maybe that is causing an issue? Not sure. Here is what I have currently:

    % Button pushed function: ExporttotxtButton
        function ExporttotxtButtonPushed(app, event)
   
    t1=writetable(app.UITable.Data,'Road Profile_fl.txt');
    [file,path] = uiputfile('Road Profile_fl.txt');  
    save(fullfile(path, file), 't1','-ascii')
           
        end 
   

The following errors are returned:

Any advice on how to fix this, or even a different strategy to accomplish the same goal would be much appreciated. Thank you.

Answer 1

[Voss]

writetable doesn't return any arguments, so that's what the error message is saying.

writetable writes a table to file. save saves variable(s) to file. Presumably you don't need to do both here.

function ExporttotxtButtonPushed(app, event)

[fn,pn] = uiputfile('Road Profile_fl.txt'); % avoid using 'path' as a variable name,
                                            % since it is a built-in function
if isnumeric(fn) % user canceled
    return       % return early
end

% write the table to the user-specified file
writetable(app.UITable.Data,fullfile(pn,fn));

end

This presumes that app.UITable.Data is in fact a table, but it could be a matrix (in which case use writematrix) or a cell array (in which case use writecell).

[Jack Lebar]

This worked perfectly, thank you!

[Voss]

You're welcome!

Answer 2

[Mario Malic]

Hi,

from the documentation writetable

writetable(T)
writetable(T,filename)
writetable(___,Name,Value)

You can see that this function has no output arguments.