www.pudn.com > logtools.rar > lasheadersss.m, change:2004-08-13,size:3922b


function lasheader = lasheadersss(lash,start,stop,step,units) 
 
% lasheader = lasheadersss(lasheader,start,stop,step,units) 
% lasheader = lasheadersss(lasheader,start,stop,step) 
% 
% Given an las header in a string matrix (such as is provided by 
% readlas) LASHEADERSSS change its start, stop, and step to 
% the appropriate values. If units is provided, it is used to specify 
% the units of start stop and step, otherwise they are unchanged. 
% 
% G.F. Margrave, CCR, Aug 94 
% 
% 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(nargin<5) 
    units=''; 
end 
[m,n]=size(lash); 
 
for k=1:m 
    tmpstr=lash(k,:); 
    [t,r]=strtok(tmpstr); 
    if(findstr(t,'STRT')) 
        lash(k,:)=replacenum(tmpstr,start,units); 
    end 
    if(findstr(t,'STOP')) 
        lash(k,:)=replacenum(tmpstr,stop,units); 
    end 
    if(findstr(t,'STEP')) 
        lash(k,:)=replacenum(tmpstr,step,units); 
    end 
end 
lasheader=lash; 
 
function tmpstr=replacenum(instring,num,units) 
        n=length(instring); 
        [t,r]=strtok(instring); 
        %test for units adjacent to the flag 
        [tt,rr]=strtok(t,'.'); 
        if(isempty(rr)) 
            [tt,r]=strtok(r); %find units 
            iu=findstr(tt,instring); 
            if(~isempty(units))%replace units 
                instring=[instring(1:iu(1)-1) '.' units instring(iu(1)+2:end)]; 
            end 
            numfield=strtok(r); 
        else 
            iu=findstr(rr,instring); 
            if(~isempty(units))%replace units 
                instring=[instring(1:iu(1)-1) '.' units instring(iu(1)+2:end)]; 
            end 
            numfield=strtok(r); 
        end 
        if(isempty(numfield)|strcmp(numfield(1),':')) 
            %if here, then "numfield" is actually a comment and we have no start specified 
            % ugh 
            tmpstr=[instring(1:iu(1)+2) num2str(num) instring(iu(1)+3:end)]; 
        else 
            ii=findstr(numfield,instring);%find the numeric field 
            tmpstr=[instring(1:ii(1)-1) num2str(num) instring(ii(1)+length(numfield):end)]; 
             
        end 
        if(length(tmpstr)<n) tmpstr=[tmpstr blanks(n-length(tmpstr))]; end 
        if(length(tmpstr)>n) tmpstr=tmpstr(1:n); end