[R] strange Sys.Date() side effect

[Duncan Murdoch]

On 12-01-10 8:04 AM, Czerminski, Ryszard wrote:
> Any ideas what is the problem with this code?
>
>> N<- 2; c(Sys.Date(), sprintf('N = %d', N))
> [1] "2012-01-10" NA
> Warning message:
> In as.POSIXlt.Date(x) : NAs introduced by coercion

You are trying to create a vector combining a Date object and a 
character object.  R is trying to coerce both objects to dates, and that 
fails.

You probably want two strings; so convert the date explicitly:

c(as.character(Sys.Date()), sprintf('N = %d', N))

(or use format or some other function to convert the date to a string.)

Duncan Murdoch

>
> Best regards,
> Ryszard
>
> Ryszard Czerminski
> AstraZeneca Pharmaceuticals LP
> 35 Gatehouse Drive
> Waltham, MA 02451
> USA
> 781-839-4304
> ryszard.czerminski at astrazeneca.com
>
>
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