[R] hclust doesn't return merge details

[Thomas W Blackwell]

Arne  -

I have carried out exactly your example below, and I
get hc$merge as a matrix with two columns and 15 rows.

Do  str(hc)  to see a useful representation of the
contents of the returned list.  help("hclust")  describes
this list in the section "Value:".  help("Subscript")
shows the various syntactic forms that will extract one
element from a list, but doesn't say quite as explicitly
as one might wish that  hc[["merge"]]  or  hc[[1]]  is
the way to return just element "merge" from the list.

Brian Ripley may correct me if I am wrong, but I think
there have never been 'extractor' functions for the
return value from  hclust()  as there are for  lm().

-  tom blackwell  -  u michigan medical school  -  ann arbor  -

On Mon, 3 Nov 2003, Arne Neumann wrote:

>  Dear R-users,
>
> I tried to receive the merge details of a clustering by using the
> summary function of hclust.
> For illustration I use the Longley data as done by Prof Ripley (Wed 11
> Apr 2001)
> d <- dist(longley.y)
> d <- d/max(d)
> hc <- hclust(d, "ave")
>
> But instead of getting a matrix for $merge I get:
> >summary(hc)
> 		Length Class  Mode
> merge       30     -none- numeric
> height      15     -none- numeric
> order       16     -none- numeric
> labels       0     -none- NULL
> method       1     -none- character
> call         3     -none- call
> dist.method  1     -none- character
>
> Am I missing something?
> Arne Neumann
>
> > R.version
> platform i386-pc-mingw32
> arch     i386
> os       mingw32
> system   i386, mingw32
> status
> major    1
> minor    7.1
> year     2003
> month    06
> day      16
>
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