MATLAB: Store data from slider to share it with a pushbutton in MATLAB GUI

Question

Hi,

I am trying to create a GUI where the user can select a value using a slider and then can obtain a plot by pressing a pushbutton. This is the code for the slider:

% --- Executes on slider movement.
function TP_Callback(hObject, eventdata, handles)
% hObject    handle to TP (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

handles.TP=get(hObject,'Value'); Tp=round(handles.TP); set(handles.text11,'String',Tp);

Then I have a pushbutton callback with the code. Here I need to use the value selected with the slider but it seems that it is not stored as I get the following warning:

"Undefined function or variable 'Tp'."

Could I get some help here?

thank you in advance.

Ana

Answer 1

In your pushbutton callback, do this:

sliderValue = handles.Tp.Value;

If you want to call it Tp, you can do that instead:

Tp = handles.Tp.Value;

This uses modern OOP syntax from R2014b or later. If you have an antique version of MATLAB, use get():

Tp = get(handles.Tp, 'Value');