This routine returns the handle of the last created (and still
existent) entity.
Examples
a=gca()//get the handle of the newly created axesa.data_bounds=[1,1;10,10];a.axes_visible='on';fori=1:5xfrect(7-i,9-i,3,3);e=gce();e.background=i;enddelete();// delete current entitydelete(gce());// delete current entitydelete(gcf());// delete current figure