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dissimilarity structure

2 messages · Francois Deshaies, Thomas Lumley

Original
Francois Deshaies
# 
How can I easily convert this format
 
INT CAB 1.0000000
LIG CAB 0.3333333
TEN CAB 1.0000000
INT LIG 1.0000000
TEN LIG 1.0000000
INT TEN 0.0000000
 
to this dissimilarity structure  format(compatible with hclust) ?
 
          CAB INT LIG
INT 1.0000000        
LIG 0.3333333   1    
TEN 1.0000000   0   1
 
(and vice versa)
 
Thanks
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Thomas Lumley
#
On Tue, 3 Jul 2001, Francois Deshaies wrote:

            

      
      
      
    

        
One way is

  m<-matrix(ncol=4,nrow=4)
  m[lower.tri(m)]<-your.dissimilarity.vector
  as.dist(m)

In fact, dissimilarity objects are just vectors with some attributes,
[unclass() a dist object to see], so you could just put these attributes
on your vector.  This is stylistically a bad idea, since in theory the
internal structure of "dist" objects could change at any time, but it
would probably work.


	-thomas

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