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