gusucode.com > DSISoft是由加拿大地质调查局发布的用于垂直地震剖面(VSP)数据处理的免费软件包 > dsisoftv3/main/padbefore.m
function [dataout]=padbefore(datain,padding) % [dataout]=padbefore(datain,padding) % %This function just addings zeros to the beginning of the data % % padding is the amount of time in seconds to be added to the beginning of the data % % Warning: The program does not check for unreasonable parameters % %Written by Marko Mah February 1999 %$Id: padbefore.m,v 3.0 2000/06/13 19:21:02 gilles Exp $ %$Log: padbefore.m,v $ %Revision 3.0 2000/06/13 19:21:02 gilles %Release 3 % %Revision 2.0 1999/05/21 18:46:12 mah %Release 2 % %Revision 1.1 1999/05/14 13:15:01 mah %Initial revision % % % %Copyright (C) 1998 Seismology and Electromagnetic Section/ %Continental Geosciences Division/Geological Survey of Canada % %This library is free software; you can redistribute it and/or %modify it under the terms of the GNU Library General Public %License as published by the Free Software Foundation; either %version 2 of the License, or (at your option) any later version. % %This library 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 %Library General Public License for more details. % %You should have received a copy of the GNU Library General Public %License along with this library; if not, write to the %Free Software Foundation, Inc., 59 Temple Place - Suite 330, %Boston, MA 02111-1307, USA. % %DSI Consortium %Continental Geosciences Division %Geological Survey of Canada %615 Booth St. %Ottawa, Ontario %K1A 0E9 % %email: dsi@cg.nrcan.gc.ca disp('[dataout]=padbefore(datain,padding)') smpint=datain.fh{8}; %smpint is the sampling interval trclengthold=datain.fh{7}; %trclength is the trace length nrec=datain.fh{12}; %nrec is number of records is file nppad=round(padding/smpint); %nppad is the number of zeros to add to the beginning of each trace trclengthnew=trclengthold+nppad; %trclengthnew is the new trace length trcendtime=(trclengthnew-1)*smpint; %trcendtime is the new trace end time dataout=datain; dataout.fh{7}=trclengthnew; %updates the number of points per trace dataout.fh{10}=trcendtime; %updates the trace end time for COUNT=1:nrec [trclength,ntraces]=size(datain.dat{COUNT}); %ntraces is the number of traces in the record dataout.dat{COUNT}=zeros(trclengthnew,ntraces); %zeros the output data dataout.dat{COUNT}(nppad+1:trclengthnew,:)=datain.dat{COUNT}; %copies the input data to the output data end %for COUNT