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/subset.m
function [dataout]=subset(datain,tr1,tr2,t1,t2,r1,r2) %function [dataout]=subset(datain,tr1,tr2,t1,t2,r1,r2) % %subset -> creates a new variable containing only the traces specified %-tr1, tr2 are the first and last traces of the desired subset %-t1, t2 are the first and last times of the desired subset in seconds %-r1 and r2 are the first and last records of the desired subset %-similar to GETR in Insight % %[dataout]=subset(datain,tr1,tr2,t1,t2,r1,r2) % %DSI customized VSP processing software %written by Kristen Beaty October, 1997 %$Id: subset.m,v 3.0 2000/06/13 19:22:13 gilles Exp $ %$Log: subset.m,v $ %Revision 3.0 2000/06/13 19:22:13 gilles %Release 3 % %Revision 2.0 1999/05/21 18:46:44 mah %Release 2 % %Revision 1.2 1999/05/17 17:17:18 mah %fixed help message % %Revision 1.1 1999/01/06 19:09:09 kay %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]=subset(datain,tr1,tr2,t1,t2,r1,r2)'); %check for errors if tr1>tr2 | t1>t2 | r1>r2 disp('check parameters for subset and try again'); error('tr1, t1 and r1 should be smaller than tr2, t2 and r2 respectively'); end; %if %find indexes corresponding to t1 and t2 startt=round((t1-datain.fh{9})/datain.fh{8}+1); %index of t1 endt=round((t2-datain.fh{9})/datain.fh{8}+1); %index of t2 %datain.fh{8} is the sampling interval in seconds %datain.fh{9} is the trace start time in seconds dt=endt-startt+1; dtr=tr2-tr1+1; %make some changes to file header dataout.fh=datain.fh; %copy file header dataout.fh{1}=dtr.*(r2-r1+1); %number of trace in dataset dataout.fh{7}=dt; %number of points/trace dataout.fh{9}=t1; %trace start time (ms) dataout.fh{10}=t2; %trace end time (ms) dataout.fh{12}=r2-r1+1; %number of records dataout.fh{13}=dtr; %max record fold for COUNT =r1:r2 %loop over records orec=COUNT-r1+1; %put selected subset into dataout dataout.dat{orec}=datain.dat{COUNT}(startt:endt,tr1:tr2); dataout.th{orec}=datain.th{COUNT}(:,tr1:tr2); %make necessary changes to trace headers dataout.th{orec}(12,1)=dtr; %number of traces in record for i=1:dtr dataout.th{orec}(13,i)=i; %trace number within record end; %for end; %loop over records