R help - Jan 2002 - cutree using a vector for h giving meaningless results

I try to use the routine cutree to cut a tree (created by hclust) into
several groups by specifiing the hight of the cut.

a<-1:10
cutree(tree, h=a*100)

The Matrix with group meberships returned is ok for most of the hights, but
in some cases (as for example h=800 and h=900) the results don't make sense
(group membership=0 or 58965231, it looks like the range of data allowed by
the data type was too small). It's interesting that h=1000 gives proper
results again. When I run the same for only one value of h (for example
800), the results are ok again. I did not use hights higher than the
maximum hight of the tree!

Thank you for any help!
Beatrice Kulli

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Beatrice Kulli
Institute of Terrestrial Ecology, Soil Physics
ETH Zuerich
Grabenstrasse 3, CH-8952 Schlieren
Phone: +41 1 633 60 17; Fax: +41 1 633 11 23
http://www.ito.umnw.ethz.ch/SoilPhys/
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>>>>> On Tue, 22 Jan 2002 18:00:22 +0100,
>>>>> Beatrice Kulli Honauer (BKH) wrote:
  > I try to use the routine cutree to cut a tree (created by hclust) into
  > several groups by specifiing the hight of the cut.

  > a<-1:10
  > cutree(tree, h=a*100)

  > The Matrix with group meberships returned is ok for most of the hights,
but
  > in some cases (as for example h=800 and h=900) the results don't make
sense
  > (group membership=0 or 58965231, it looks like the range of data allowed
by
  > the data type was too small). It's interesting that h=1000 gives
proper
  > results again. When I run the same for only one value of h (for example
  > 800), the results are ok again. I did not use hights higher than the
  > maximum hight of the tree!

could you give a complete reproducible example, i.e., code to create a
tree where you observe the problem? "in some cases" is a
little bit hard to debug ...

best,

-- 
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                        Friedrich  Leisch 
Institut f?r Statistik                     Tel: (+43 1) 58801 10715
Technische Universit?t Wien                Fax: (+43 1) 58801 10798
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A-1040 Wien, Austria             http://www.ci.tuwien.ac.at/~leisch
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