[R] length with missing values

[Peter Dalgaard]

"Dimitris Rizopoulos" <dimitris.rizopoulos at med.kuleuven.ac.be> writes:

> Hi Luis,
> 
> just use:
> 
> apply( mat, 2, function(x) length(x[!is.na(x)]) )


or:

apply(!is.na(mat),2,sum)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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