[R] lapply problem

[Peter Dalgaard]

"Luis Rideau Cruz" <Luisr at frs.fo> writes:

> R-help,
> 
> I wish to replace NULL elements(or missing) in the following list :
...
> If I use 
> lapply(z2,function(x) ifelse(is.null(x),0,as.numeric(x))) 
...
> i.e,only the first element in z2

ifelse(....) gives a result that is the same length as the condition,
and is.null(x) has length 1. You want

if (is.null(x)) 0 else as.numeric(x)

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