?? gdfseek.m
字號(hào):
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;
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