[R] how to count number of elements in a vector that are not NA ?

[Giovanni Petris]

sum(!is.na(x))

> Date: Tue, 07 Jul 2009 14:56:54 -0400
> From: Godmar Back <godmar at gmail.com>
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> 
> Hi,
> 
> is there a simpler way to count the number of elements in a vector
> that are not NA than this:
> 
> countN <- function (v) {
>     return (Reduce(function (x, y) x + y, ifelse(is.na(v), 0, 1)))
> }
> 
> ?
> 
>  - Godmar
> 
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