distinc.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 s=distinc(x,y)

% s=distinc(x,y)
%
% This function computes the incremental distance between each pair of points
%  represented by the vectors x and y. See also distcum distpoint and distreach
%
% x = vector containing the x coordinates of the data
%				 ******* default= no field set *********
% y = vector containing the y coordinates of the data
%				 ******* default= no field set *********
% s = distance vector containing the distance between each pair of points in
%     x and y. Note: length(s) == length(x). s(1) == 0, s(2) == ( distance from
%     point 2 to point 1), s(j) = ( distance from point j to point j-1 )
%
% by G.F. Margrave, March 1993
%
% 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

% 
[a,b]=size(x);
x=x(:);
y=y(:);
n=length(x);
s=zeros(size(x));
s(2:n) = (x(2:n)-x(1:n-1)).^2  +  (y(2:n)-y(1:n-1)).^2;
s=s.^(.5);
s=reshape(s,a,b);