On Apr 16, 2013, at 6:38 AM, arun wrote:
> Hi,
> I am not sure about the problem.
> If your non-numeric vector is like:
> a,b,,d,e,,f
>
> vec1<-unlist(str_split(readLines(textConnection("a,b,,d,e,,f")),","))
> vec1[vec1==""]<- NA
> vec1
> #[1] "a" "b" NA "d" "e" NA "f"
>
> If this doesn't work, please provide an example vector.
> A.K.
>
>
>
>> Thanks for the response. That seems to do the trick as far replacing the
>> empty
> cells with <NA>, however, the problem remains that the vector is
> not >numeric. This was the reason I wanted to replace the empty cells
> with NAs in the first place. Forcing the vector with as.numeric
> afterwards doesn't >seem to work either, I get nonsensical results.
In R there are actully multiple version of NA and in hte case of character
objects the reserved name is `NA_character_` , ..... not "NA". You can also use
`is.na<-`
#Method: `is.na<-`
> vec <- sample(c(letters[1:5], ""), 20, repl=TRUE)
> vec
[1] "d" "a" "b" "" "" "" "d" "b" "c" "d" "" "b" "b" "e" "" "c" "" ""
"a" "a"
> is.na(vec) <- vec==""
> vec
[1] "d" "a" "b" NA NA NA "d" "b" "c" "d" NA "b" "b" "e" NA "c" NA NA
"a" "a"
-----------
Method: assign NA_character_
> vec <- sample(c(letters[1:5], ""), 20, repl=TRUE)
> vec
[1] "e" "c" "e" "b" "e" "c" "a" "d" "b" "d" "d" "" "d" "b" "d" "" "e" "e"
"a" ""
> vec[vec==""] <- NA_character_
> vec
[1] "e" "c" "e" "b" "e" "c" "a" "d" "b" "d" "d" NA "d" "b" "d" NA "e" "e"
"a" NA
--
David Winsemius
Alameda, CA, USA
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