R help - Oct 2005 - convering upper triangular matrix into vector

Hi

I have two symmetrical distance matrices and want to compute the correlation
coefficient between them (after turning them into vectors). 

Is there a way of selecting only the upper triangular part of each matrix, then
convert this into a vector so I can compute the correlation?

Many Thanks
Eleni Rapsomaniki

e.rapsomaniki at mail.cryst.bbk.ac.uk writes:
> Hi
> 
> I have two symmetrical distance matrices and want to compute the
correlation
> coefficient between them (after turning them into vectors). 
> 
> Is there a way of selecting only the upper triangular part of each matrix,
then
> convert this into a vector so I can compute the correlation?
X[upper.tri(X)]

(as help.search("triangular") would have told you soon enough)

-- 
   O__  ---- Peter Dalgaard             ??ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

look at: '?upper.tri()'

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: <e.rapsomaniki at mail.cryst.bbk.ac.uk>
To: <R-help at stat.math.ethz.ch>
Sent: Sunday, October 02, 2005 11:04 AM
Subject: [R] convering upper triangular matrix into vector

> Hi
>
> I have two symmetrical distance matrices and want to compute the 
> correlation
> coefficient between them (after turning them into vectors).
>
> Is there a way of selecting only the upper triangular part of each 
> matrix, then
> convert this into a vector so I can compute the correlation?
>
> Many Thanks
> Eleni Rapsomaniki
>
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