Hopefully this helps:
1) Save the handles of the ui elements. Suppose that hpopup and hslider are the handles of the pop up menu and the slider, respectively.
2) When you define the pop up menu, add in the list of arguments:
...,'Callback',@modslider...
@modslider is a function that will be call whenever you choose a different option in the pop up menu. The name modslider is just a name, you can change it as you wish.
3) Define a function
function modslider(hcall,eventdata)
end
hcall contains the handle of the ui that called it. From there you can get what option is active using
get(hcall,...)
and set the appropriate value of the slider using
set(hslider,...)
Best regards
