Definition of distance between data:
(1) Hamming Distance: d(i,j)=sum(abs(x(i,k)-x(j,k))) | k from 1 to m
(2) Euclid Distance: d(i,j)=sum((x(i,k)-x(j,k))^2) | k from 1 to m
(3) Mahalanobis Distance: Eliminiate the units of each vector.
Non-distance methods:
(1)
To be continued...
原文：http://www.cnblogs.com/jast/p/4485866.html