[R] finding centroids of clusters created with hclust

[Moritz Lennert]

Hello,

Can someone point me to documentation or ideas on how to calculate the 
centroids of clusters identified with hclust ?

I would like to be able to chose the number of clusters (in the style of 
cutree) and then get the centroids of these clusters.

This seems like a quite obvious task to me, but I haven't been able to 
put my hands on a relevant command.

Thank you,

Moritz