MATLAB: My slider disappears and it comes up with that error

Question

I am trying to write a function for having the slider moves according to the mouse wheel. Here is my code

function mouseScroll(~,eventdata,I)
          handles = guidata(gcf);
          S = round((get(handles.SliderFrame,'Value')));
          sno = size(MyMatrix);
          UPDN = eventdata.VerticalScrollCount;
          S = S - UPDN;
          if (S < 1)
              S = 1;
          elseif (S > sno)
              S = sno;
          end
          if sno > 1
              set(handles.SliderFrame,'Value',S);
              set(handles.Edit1, 'String', sprintf('Slice# %d / %d',S, sno));
          else
              set(handles.Edit1, 'String', '2D image');
          end
          frameindex  = max(1, min(S, NumFrames));
          handles.frameindex = frameindex+1;
          ff = filelist{frameindex};
          I=dicomread(ff);
         imshow(I, 'parent', handles.axes1);
      guidata(hFig,handles);
      drawnow()
      end

I get the error "Warning: 'slider' control cannot have a 'Value' outside of 'Min'-'Max' range Control will not be rendered until all of its parameter values are valid" when the slider exceeds the maximum value, where it disappears.

Any idea?

Answer 1

Replace

set(handles.SliderFrame,'Value',S);

with

if S>get(handles.SliderFrame,'Max')
    S=get(handles.SliderFrame,'Max');
elseif S<get(handles.SliderFrame,'Min')
    S=get(handles.SliderFrame,'Min');
end
set(handles.SliderFrame,'Value',S);