function [status,POS,EDF]=gdfseek(arg1,offset,origin)% [status,POS,EDF]=gdfseek(EDF_Struct,offset,origin)% Currently, offset and origin are the number of (EDF) records. % It is considered to change it to seconds. % EDFSEEK FUNCTIONALITY MIGHT CHANGE IN FUTURE VERSIONS%% see also: fseek %	Version 0.46%	12 May 1999%	Copyright (c) 1997-1999 by Alois Schloegl%	a.schloegl@ieee.org	% This program is free software; you can redistribute it and/or% modify it under the terms of the GNU General Public License% as published by the Free Software Foundation; either version 2% of the  License, or (at your option) any later version.% % This program is distributed in the hope that it will be useful,% but WITHOUT ANY WARRANTY; without even the implied warranty of% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the% GNU General Public License for more details.% % You should have received a copy of the GNU General Public License% along with this program; if not, write to the Free Software% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.%  12 May 1999 EDF.AS.startrec and EDF.AS.numrec includedEDF=arg1;%EDF.AS.startrec=0;EDF.AS.numrec=0;if origin==-1 | origin=='bof'	EDF.AS.startrec=offset;        OFFSET=EDF.HeadLen+EDF.AS.bpb*offset;        status=fseek(EDF.FILE.FID,OFFSET,origin);elseif origin==0 | origin=='cof'	EDF.AS.startrec=EDF.AS.startrec+offset;        OFFSET=EDF.AS.bpb*offset;        status=fseek(EDF.FILE.FID,OFFSET,origin);elseif origin==1 | origin=='eof'	EDF.AS.startrec=EDF.NRec+offset;        OFFSET=EDF.HeadLen+EDF.AS.bpb*(EDF.NRec+offset);        status=fseek(EDF.FILE.FID,OFFSET,origin);end;POS = (ftell(EDF.FILE.FID)-EDF.HeadLen)/EDF.AS.bpb;if POS<1 | POS>EDF.NRec %if POS<EDF.HeadLen | POS>EDF.HeadLen+EDF.AS.spb*2*EDF.NRec         status=-1;else        status=0;end;