R help - Dec 2010 - Silhouette function problem

Hi,

I am using code below to get a plot that will show me on the X axis the
number of clusters and on the Y axis the cluster average widths. However I
am getting this error:

Error in summary(silhouette(cutree(d, x), dist(iris[, -5])))$si.summary : 
  $ operator is invalid for atomic vectors

the code I am using is:

avgs<-sapply(1:20,function(x)
summary(silhouette(cutree(d,x),
dist(iris[,-5])))$si.summary[4]) 

I think the problem is on the si.summary.

What can I do to solve this problem?

thank you

Regards,
A Dias.
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ADias wrote:
> 
> Hi,
> 
> I am using the code below to get a plot that will show me on the X axis
> the number of clusters and on the Y axis the cluster average widths.
> However I am getting this error:
> 
> Error in summary(silhouette(cutree(d, x), dist(iris[, -5])))$si.summary : 
>   $ operator is invalid for atomic vectors
> 
> the code I am using is:
> 
> avgs<-sapply(1:20,function(x)
> summary(silhouette(cutree(d,x),
> dist(iris[,-5])))$si.summary[4]) 
> 
> I think the problem is on the si.summary.
> 
> What can I do to solve this problem?
> 
> thank you
> 
> Regards,
> A Dias.
> 
Hi,

I have made this script

library(cluster)
d<-hclust(dist(iris[,-5]))
avgs<-sapply(1:20,function(x)
summary(silhouette(cutree(d,x),
dist(iris[,-5]))))
str(avgs)

I need $ avg.width  but I don't know how to take that out from the object
avgs.
The mode from avgs is "list" but it does not work as a normal list.

Any help would be apreciated.

thanks
A. Dias
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