deletes objects and corresponding data from swplot figure
Syntax
swplot.delete(objID)
swplot.delete(hFigure,objID)
Description
swplot.delete(objID) deletes objects and their data that corresponds to
the given unique objID (integer number) on the active swplot figure.
swplot.delete(hFigure,objID) deletes objects from the swplot figure
corresponding to hFigure handle.
If objID equals to 0, all objects will be deleted from the swplot
figure.