How to refresh a GUI data in a given time step, automatically?

I have written a code that composes of several steps, i.e. several processing steps and then some GUI for visualization and plotting; steps are like: criterion 1, criterion 2, GUI control, and plot.

For repeating of the steps and showing results for different criteria, I need to make the GUI data (variables) get refreshed in a given time step, automatically. I want to embed the functionality within the GUI opening file. I used the following code, but it does not working. Maybe it's because of the 'Running' mode that is 'off'; but I don't know how to turn it on. Could somebody help me, please?

 function my_gui_OpeningFcn

 t = timer;
t.StartDelay = 0.1;
t.ExecutionMode = 'fixedRate'
t.Period = 1
t.TimerFcn = @(myTimerObj, thisEvent)refreshdata(hObject,handles);
start(t)
handles.timer = t

 handles.output = hObject;
guidata(hObject, handles);
end

Answer 1

[Walter Roberson]

Unless you are using a nested function that you have not displayed here, in your

t.TimerFcn = @(myTimerObj, thisEvent)refreshdata(hObject,handles);

neither hObject nor handles will be defined. Also, refreshdata() takes only a single parameter unless you supply the option 'caller'.

You have

   function my_gui_OpeningFcn

if instead you had

   function my_gui_OpeningFcn(hObject, event)

then you could use

t.TimerFcn = @(myTimerObj, thisEvent)refreshdata(hObject);

provided that the objects to be refreshed are all children of the GUI figure itself.

[Ali Y.]

Thank you for your help Walter; applying the modification makes the code functioning; though, I found It will not be helpful, since my code only refresh the gui's data (objects and handles) without catching the updated work-space data. When I change the refreshdata (hObject,handles) to refreshdata (my_gui), It refresh the gui window that makes the window blink and untouchable.

Therefore, I think it is better, for me, to do the refresh outside of the gui and assign it to another callback function.