[R] hcluster with linkage median

[Kennedy]

Thank you Peter for your help.

I had tried hclust before but I made the mistake of using the D matrix above
instead of a dist object. Hence

  library(flashClust)

  d <- as.dist(D)
  # Clustering using hclust
  hc <- hclust(d, method = "median",members=NULL)
  # Clustering using flashClust 
  fc <- flashClust(d,method="median",members=NULL)

solves the problem I posted. But another question arises. How is the median
linkage calculated? I want it to be like this:

Given clusters C1=(1,2,3) and C2=(4), the distance between C1 and C2 is: 
  d(C1,C2) = median(d(1,4),d(2,4),d(3,4)) = median(0.2, 1.0, 0.8) = 0.8,
where the values d(1,4), d(2,4) and d(3,4) are taken from the D matrix
above.

If this is not the case, is there any function that uses this linkage
metric?


Thanks

Henrik

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