How to update values ​​in a graph taken from a slider

I'm programming a PID (GUI) for a control system, but I have problems with the sliders. I can not make the graph updates as you move the slider.

I have to do that every time the slider is moved to update the graphics, without pressing any additional buttons.

Answer 1

[Azzi Abdelmalek]

You need to insert a plot function inside a slider function callback.

[Carlos Zuñiga]

Yes, the problem is that the data is not updated automatically.

e.g.

slider1_Callback function (hObject, eventdata, hand ....
h = get (handles.slider1, 'value')
sys = feedback (sys, h)
axes (handles.axes1)
rlocus (sys)
grid on

But when you move the slider the graph does not change.

[Azzi Abdelmalek]

What is sys? can you post the full slider1_Callback function?