SquareDistance=TwoNormSqDist(p1,p2)

% This function computes "SQUARE of distance"
function SquareDistance=TwoNormSqDist(p1,p2)
%INPUT
% p1=[x1,x2....xn) (or column vector)
% p2=[y1,y2....yn) (or column vector)
%OUTPUT
% 2-norm square distance between p1 and p2

% The algorithms is based on euclidean distance 


SquareDistance=0;
for i=1:length(p1)
    SquareDistance=SquareDistance + ( ( p1(i)-p2(i) ).^2 ) ;
end


% Notes:
% For many applications we can make dicision based on square distance only
% rather than distance. So by computing square distace we avoid to compute
% square root.
% If you want distance than just compute the squre root of square distance
% i.e. sqrt(SquareDistance).

% Reference: http://en.wikipedia.org/wiki/Distance 

% % % --------------------------------
% % % Author: Dr. Murtaza Khan
% % % Email : [e-mail]
% % % --------------------------------