On Wed, 23 Jul 2003 [EMAIL PROTECTED] wrote:
> I understand how R treats NAs but in the situation below it would be nice to
> have a na.skip argument to paste so it does not convert the NAs to "NA"s and
> simply skips those elements of the vector for pasting.
>
> > x
> [1] "2.13" "2.3" NA NA "2.83" NA
>
> > paste(x, "0", sep="")
> [1] "2.130" "2.30" "NA0" "NA0" "2.830" "NA0"
>
> With na.skip argument:
>
> paste(x, "0", sep="", na.skip=T)
> [1] "2.130" "2.30" NA NA "2.830" NA
How about
ifelse(is.na(x), NA, paste(x,"0",sep=""))
> Otherwise I will use:
>
> y <- paste(x, "0", sep="")
> gsub(paste("NA","0",sep=""),"", y)
>
> "" is not the same as NA, but for my purposes "" is close enough. Why can't
> I use NA as a replacement in gsub, even though c("a", NA) works?
>
You need to use a character NA. Plain NA is a logical. SO
gsub("NA0",as.character(NA), y)
will work. This is arguably a bug.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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