Moving a Marker point across Data using handles "XData"

I want to translate a cyan circle across a set of peaks on an axes.

I therefore plot assigning the plot to a handle h2. I originally start at the first location

h2=plot(xxx(1),yyy(1),'co')

In a button callback I want to then increment the cyan circle across each peak. I have the locations of the peaks in a vector xxx. It has kindly been suggested to use the handles Xdata of the specific object I want to move, namely the cyan circle.

So I want to use

h2.XData= xxx(i)

where I increment i.

My problem is how do i pass the h2 plot handle (of the cyan circles) to the button callback?

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F