padpow2.m

基于matlab的反演程序,用于地球物理勘探中射线追踪及偏移成像程序.

function trout=padpow2(trin,flag);
% PADPOW2: pad a trace with zeros to the next power of 2 in legth.
%
% trout=padpow2(trin,flag);
% trout=padpow2(trin)
%
% PADPOW2 pads the input trace to the next power of two. 
%
% flag= 1 --> If the trace is already an exact power of two, then
%             its length will be doubled.
%     = 0 --> If the trace is already an exact power of two, then
%             its length will be unchanged
%    ********* default = 0 ************
%
% by G.F. Margrave, May 1991
%
% 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:  [e-mail]
% 
% 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<2), flag=0; end
%
 n=2.^(nextpow2(trin));
 if (n==length(trin))&(flag==1)
   n=2.^(nextpow2(length(trin)+1));
 end
 [nr,nc]=size(trin);
 if(nr==1)
		 trout=[trin zeros(1,n-nc)]; %row vectors
 else
		 trout=[trin;zeros(n-nr,nc)]; %column vectors
 end