R help - Jun 2011 - how can I??

st1=c(5,3)
st2=c(-1,2)
st3=c(1,3)
st4=c(2,6)

st = rbind(st1,st2,st3,st4)
st
dx=round(dist(st), digits=2)
dx  #À¯Å¬¸®µå °Å¸®Çà·Ä
D1=dist(st, method="euclidean")
D1  # À¯Å¬¸®µå°Å¸® ±¸Çϱâ

D2=dist(st, method="manhattan")
D2  # ¸ÇÇÏź °Å¸®Çà·Ä



and I want know 

How can i use   statistical distance   and   Mahalanobis   distance


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