www.pudn.com > logtools.rar > logblock.m, change:2004-08-13,size:3377b

function logout=logblock(login,zlog,zbdys,flag)  % logout=logblock(login,zlog,zbdys,flag) % % Block a well log. % % login = column vector containing the log samples % zlog = column vector containing the sample depths % zbdys = vector of block boundaries. There must be at least %	2 boundaries. Log will be blocked between each pair of %	boundaries. Ends of log will not be blocked unless boundaries %   are defined at the ends. Boundaries will be sorted into ascending %	order so they need not be on input % flag = 1 ... MEAN : each log segment will be replaced by the log %              mean value. %        2 ... MEDIAN : each log segment will be replaced by the log %              median value. %        3 ... LINEAR TREND : each log segment will be replaced by  %              a linear trend determined by least squares % Note that in all cases NAN's are ignored unless the entire log % segment is NAN in which case NAN is returned. % % NOTE: It is illegal for you to use this software for a purpose other % than non-profit education or research UNLESS you are employed by a CREWES % Project sponsor. By using this software, you are agreeing to the terms % detailed in this software's Matlab source file.   % BEGIN TERMS OF USE LICENSE % % This SOFTWARE is maintained by the CREWES Project at the Department % of Geology and Geophysics of the University of Calgary, Calgary, % Alberta, Canada.  The copyright and ownership is jointly held by  % its author (identified above) and the CREWES Project.  The CREWES  % project may be contacted via email at:  crewesinfo@crewes.org %  % The term 'SOFTWARE' refers to the Matlab source code, translations to % any other computer language, or object code % % Terms of use of this SOFTWARE % % 1) Use of this SOFTWARE by any for-profit commercial organization is %    expressly forbidden unless said organization is a CREWES Project %    Sponsor. % % 2) A CREWES Project sponsor may use this SOFTWARE under the terms of the  %    CREWES Project Sponsorship agreement. % % 3) A student or employee of a non-profit educational institution may  %    use this SOFTWARE subject to the following terms and conditions: %    - this SOFTWARE is for teaching or research purposes only. %    - this SOFTWARE may be distributed to other students or researchers  %      provided that these license terms are included. %    - reselling the SOFTWARE, or including it or any portion of it, in any %      software that will be resold is expressly forbidden. %    - transfering the SOFTWARE in any form to a commercial firm or any  %      other for-profit organization is expressly forbidden. % % END TERMS OF USE LICENSE  if(length(zbdys)<2) 	error('Must have at least 2 defined boundaries'); end  zbdys=sort(zbdys);  logout=login; nblks=length(zbdys)-1;  for k=1:nblks 	iblk=between(zbdys(k),zbdys(k+1),zlog,1); 	%iblk indexes the points in the zone. Now find the subset 	%of them that are live 	ilive=find(~isnan(login(iblk))); 	if(isempty(ilive)) 		logout(iblk)=nan*ones(size(iblk)); 	else 		lseg=login(iblk(ilive)); 		zseg=zlog(iblk(ilive));  		%determine mean, median or trend 		if(flag==1) 			p=zeros(1,2); 			p(2)=mean(lseg); 		elseif(flag==2) 			p=zeros(1,2); 			p(2)=median(lseg); 		elseif(flag==3) 			if(length(zseg)>=2) 				p=polyfit(zseg,lseg,1);  			else 				p=[lseg(1) 0]; 			end 		end 		logout(iblk)=polyval(p,zlog(iblk)); 	end  end