On Sep 21, 2010, at 5:28 AM, Jeff Newmiller wrote:
Short answer: don't do that.
The format function is for preparing data for output. Do your data
manipulations on a data frame you keep for such use, and only use
format to prepare for output.
That is excellent advice. But to answer the question for the situation
where the problem is less global, or in which the person were
determined to press on....
To substitute "." for NA then the is.na function is needed:
> cvec <-c("1", "2 400.3", NA)
> cvec[is.na(cvec)] <- "."
Note(s):
"NA" is not NA, and nothing ever, ever "=="'s NA
> is.na(NA)
[1] TRUE
> is.na("NA")
[1] FALSE
> NA == NA
[1] NA
> NA == "NA"
[1] NA
--
David.
"n.via...@libero.it" <n.via...@libero.it> wrote:
Dear R list
I have a problem with NA, which should be a string, but R seems
that it
doesn't recognize it. What I do is first give the format command
to my data
frame:
format.data.frame(mydata,big.mark=" ")
so I give a blank as thousand separator. All my records in my data
frame
become strings, so instead of having NA I have "NA". I try to
convert "NA" in
".",but it seems that R doesn't recognize "NA".
Someone knows why and how to treats those "NA"??
Thanks for your attention
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David Winsemius, MD
West Hartford, CT
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