function C = dual(A)% dual(A): return the dual, A/I3%%See also gable.% GABLE, Copyright (c) 1999, University of Amsterdam% Copying, use and development for non-commercial purposes permitted.%          All rights for commercial use reserved; for more information%          contact Leo Dorst (leo@wins.uva.nl).%%          This software is unsupported.	C=GAdual(GA([A;0;0;0;0;0;0;0]));