Need help to delete a variable in matlab

I have created a Matlab GUI with 2 buttons, connect and disconnect, which connect and disconnects a arduino, but i have an error with my disconnect button, this is my code:

function disconnect_Callback(hObject, eventdata, handles)
% hObject    handle to disconnect (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
delete(handles.a);
msgbox('Arduino successfully Disonnected','Disconnected');

Whenever I press the disconnect button, i get the following error: "Cannot access method 'delete' in class 'arduino'."

Please help

[Jan]

What is the contents of handles.a?

[Vincent Valenzuela]

the arduino port

handles.a=arduino(port);

[Jan]

And does this work:

a = arduino(port);
pause(1);
delete(a)

Answer 1

[Image Analyst]

Maybe try

rmfield(handles, 'a');

If that doesn't work, then I would not recommend attaching the arduino object to the handles structure. I'd just keep it separate. In fact, I'd recommend this anyway.

[Vincent Valenzuela]

thanks, but didn't work, now when i press the button it appear that the Com port is deleted, but its not.