symdist.m

这是一个超宽带的源码

% function sd = symdist(i,j,coord,area)
%
% Arguments:
% i,j - node indices
% coord - coordinates of nodes
% area - size of torus (x,y)
%
% Returns:
% sd - distance between nodes
% 
% calculates distance between nodes <i> and <j> with coordinates from <coord>
% assuming they are placed on a torus with dimensions <area>. 
% 

function sd = symdist(i,j,coord,area)

sd = Inf;
cd = [coord(j,:); coord(j,:) + [area(1),0]; coord(j,:) - [area(1),0]; ...
		coord(j,:) + [0, area(2)]; coord(j,:) - [0, area(1)]];

for k=1:5
	sd = min(sd, sqrt((coord(i,1)-cd(k,1))^2 + (coord(i,2)-cd(k,2))^2));
end