[R] Adding elements in an array where I have missing data.

[Gabor Grothendieck]

Here are a few alternatives:

replace(a, is.na(a), 0) + b

ifelse(is.na(a), 0, a) + b

mapply(sum, a, b, MoreArgs = list(na.rm = TRUE))

On 5/1/06, John Kane <jrkrideau at yahoo.ca> wrote:
> This is a simple question but I cannot seem to find
> the answer.
> I have two vectors but with missing data and I want to
> add them together with
> the NA's being ignored.
>
> Clearly I need to get the NA ignored.  na.action?
>
> I have done some searching and cannot get na.action to
> help.
> This must be a common enough issue that the answer is
> staring me in the face
> but I just don't see it.
>
> Simple example
> a <- c(2, NA, 3)
> b <- c(3,4, 5)
>
> What I want is
> c <- a + b where
> c  is ( 5 , 4 ,8)
>
> However I get
> c is (5,NA, 8)
>
> What am I missing?  Or do I somehow need to recode the
> NA's as missing?
>
> Thanks
>
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