Hi David,
You bring up a good question.  I am not sure what is the "right" way to
solve it.  But here is a simple solution I put together:

x = c(1:10,5)
y = x
x[c(2,3)] <- NA

# reproducing the problem:
y[x==5]

na2F <- function(x) {
    x2 <- x
    x2[is.na(x)] <- F
    x2
}
na2F(x==5)

# "solved"
y[na2F(x==5)]


I'd be happy to see other solutions to it.

With regards,
Tal



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On Thu, Apr 12, 2012 at 12:08 PM, David Studer <studerov@gmail.com> wrote:

> Hello everybody,
>
> I know this is pretty basic stuff, but could anyone explain me how to
> recode a single value of a variable
> into a missing value?
>
> I used to do it like this:
>
> myData[myData$var1==5;"var1"]<-NA             # recode value "5" into "NA"
>
> But the column "var1" already contains NAs, which
> results in the following error message:
>
> "missing values are not allowed in subscripted assignments of data frames"
>
> Thank you very much for any advice!
>
> David
>
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>
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