[R] Odd behaviour of as.POSIXct

[Duncan Murdoch]

On 15/07/2011 12:15 PM, Johannes Egner wrote:
> Dear all,
>
> how come the first loop in the below fails, but the second performs as
> expected?
>
> days<- as.Date( c("2000-01-01", "2000-01-02") )
>
> for(day in days)
> {
>      as.POSIXct(day)
> }

"day" in the loop above is an integer without a class, it's not a Date.  
If you did

for (day in days) {
   class(day) <- class(days)
   print(as.POSIXct(day))
}

you won't get an error.  (I don't know if you'll be happy with what you 
get; the time zone is an issue.)

Duncan Murdoch

> for( n in 1:length(days) )
> {
>      show(as.POSIXct(days[n]))
> }
>
> Many thanks, Jo
>
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>
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