contig.m

计量工具箱

function W=contig(x,y,distance)
% PURPOSE : This function computes a contiguity matrix based on a distance threshold
%---------------------------------------------------------------------------
% USAGE : W=contig(x,y,distance)
%    where : x : (n x 1) vector of the latitudes
%            y : (n x 1) vector of the longitudes
%            distance : threshold distance  
%----------------------------------------------------------------------------- 
% OUTPUTS :  W : contiguity matrix(n x n) 
%-----------------------------------------------------------------------------   
% used in morancontiplot.m
%------------------------------------------------------------------------
% Christine Thomas-Agnan, Anne Ruiz-Gazen, Julien Moutel
% June 2003
% Universit