www.pudn.com > logtools.rar > lashgetblk.m, change:2004-08-13,size:3061b

function [block,ibeg,iend]=lashgetblk(lash,bname)  % [block,ibeg,iend]=lashgetblk(lash,bname) %  % LASHGETBLK interrogates a LAS header to find a logical data % 'block'. A block is defined as beginning with a line:  % ~bname % where bname is a string, and ending at the beginning of the next  % block or the EOF. Note that the block is considered matched if % the line in the LAS header matches ~bname up to the length of bname. % Thus a line in an LAS header like  % ~logedit parameters % will match with bname of ~log, or ~logedit, etc... The returned block % is the first matching one. The match is not case sensitive. % lash ... LAS header in a string matrix % bname ... string containing the block name % block ... string matrix containing the block including the ~bname line. % ibeg ... the line number in lash of the beginning of the block % iend ... the line number in lash of the end of the block % % G.F. Margrave, Department of Geology and Geophysics, %	University of Calgary, 1996 % % 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  [nlines,m]=size(lash);  k=1; ibeg=0; iend=0; target=['~' lower(bname)]; ln=length(target);  while k<=nlines 	% check for ~ 	if(lash(k,1)=='~') 		str=lash(k,:); 		 		if(strcmp(lower(str(1:ln)),target) ) 			ibeg=k; 		else 			if(ibeg) 				iend=k-1; 				break; 			end 		end 	end 	 	k=k+1; end  if(iend & ibeg) 	block=lash(ibeg:iend,:); else 	block=[]; end