Clear current axes
cla reset deletes from the current axes all graphics objects regardless of the setting of their HandleVisibility property and resets all axes properties, except Position and Units, to their default values.
Remove axes and clear objects from them in plot edit mode. For details, see Working in Plot Edit Mode.
The cla command behaves the same way when issued on the command line as it does in callback routines — it does not recognize the HandleVisibility setting of callback. This means that when issued from within a callback routine, cla deletes only those objects whose HandleVisibility property is set to on.