On 23 Feb 2015, at 15:06 , Alain D. <dialvac-r at yahoo.de> wrote:
> Dear R-List
>
> I have a date column formatted dd.mm.yyyy separated by points that was
converted
> into a number using as.integer(date). Now I wish to convert the number back
into
> the original date. Something like:
>
> date<-as.factor(c("07.12.2010","29.04.2013"))
>
> dd<-as.integer(date)
>
> as.Date(dd, origin="%d.%m.%Y")# does not work
>
> Is there a way to convert "dd" back to "date"?
> dd
[1] 1 2
So, not without referring to the value of `date`, at the very least its factor
levels.
> as.Date(levels(date)[dd], format="%d.%m.%Y")
[1] "2010-12-07" "2013-04-29"
which is really not different from
> as.Date(date, format="%d.%m.%Y")
[1] "2010-12-07" "2013-04-29"
>
> Thank you for help!
>
> Best wishes
>
> Alain
>
> [[alternative HTML version deleted]]
>
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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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