function G = GAsignature(Sign1,Sign2,Sign3)%GAsignature: Changes the signature of the space.%Also returns the signature as a row matrix%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.persistent GAsignature3;persistent GAsignature2;persistent GAsignature1;if nargin == 3   GAsignature3=Sign3;   GAsignature2=Sign2;   GAsignature1=Sign1;endG=[prod(GAsignature1),prod(GAsignature2),prod(GAsignature3)];