[R] How to capture NA values

[David Winsemius]

On May 10, 2012, at 11:16 AM, Alaios wrote:

> Dear all,
> I would like to capture the NA values as produced from my code
> the str over the return values return
>
> int 61
>  int 65
>  int 69
>  int 73
>  int 101
>  int NA
>  int NA
>
> it looks like that I am getting returned some integer values that  
> are NA and I want to have an if statement for catching those
>
> which is the right operator for checking these int NA values in R?

If you have a vector of mode 'integer' (or numeric) you can get their  
index locations with:

which(is.na(vec))

Logical tests for any NA's would be:

!length(which(is.na(vec)))

or

sum(is.na(vec))==0

or perhaps the most self-documenting method:

any(is.na(vec))

-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT