[R] Matrix indexing question

[Peter Dalgaard BSA]

r.e.darnell at ncl.ac.uk (R.E. Darnell) writes:

> I apologise if this type of question has been answered before, however
> how do I count the number of TRUE's in the upper half (non-symmetric)
> matrix of logicals.

Perhaps something like

sum(x & upper.tri(x))

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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