[Rd] "NA" vs. NA

(Ted Harding) Ted.Harding at wlandres.net
Thu Apr 5 13:22:03 CEST 2012

On 05-Apr-2012 11:03:15 Adrian Dusa wrote:
> Dear All,
> I assume this is an R-devel issue, apologies if I missed something
> obvious. I have a dataframe where the row names are country codes,
> based on ISO 3166, something like this:
> ------------
> "v1"    "v2"
> "UK"    1    2
> "NA"    2    3
> ------------
> It happens that "NA" is the country code for "Namibia", and that
> creates problems on using this data within a package due to this:
> Error in read.table(zfile, header = TRUE, as.is = FALSE) :
>   missing values in 'row.names' are not allowed
> I realise that NA is reserved in R, but I assumed that when quoted it
> would be usable.
> For the moment I simply changes the country code, but I wonder if
> there's any (other) solution to circumvent this issue.
> Thanks very much in advance,
> Adrian

Hi Adrian,
The default in read.table() for the "na.strings" parameter is

  na.strings = "NA"

So, provided you have no "NA" in the data portion of your file
(or e.g. any missing values are simply blank) you could use
something like:

read.table(zfile, header = TRUE, as.is = FALSE, na.strings="OOPS")

which should avoid the problem.

Hoping this helps,

E-Mail: (Ted Harding) <Ted.Harding at wlandres.net>
Date: 05-Apr-2012  Time: 12:21:57
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