R help - Jul 2014 - Cutting hierarchical cluster tree at specific height fails

Hi,

I'd like to cut a hierachical cluster tree calculated with hclust at a
specific height.
However ever get following error message:
"Error in cutree(hc, h = 60) :
  the 'height' component of 'tree' is not sorted
(increasingly)"


Here is a working example to show that when specifing a height in  cutree()
the code fails. In contrast, specifying the number of clusters in cutree()
works.
What is the exact problem and how can I solve it?

x <- c(rnorm(100,50,10),rnorm(100,200,25),rnorm(100,80,15))
y <- c(rnorm(100,50,10),rnorm(100,200,25),rnorm(100,150,25))
df <- data.frame(x,y)
plot(df)

hc <- hclust(dist(df,method = "euclidean"),
method="centroid")
plot(hc)

df$memb <- cutree(hc, h = 60) # this does not work
df$memb <- cutree(hc, k = 3) # this works!

plot(df$x,df$y,col=df$memb)


Thank you for your hints!

Best regards,
Johannes

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