Try this:
> dateseq <- function(i) seq(DF[i, 1], DF[i, 2], 1)
> table(as.Date(unlist(lapply(1:nrow(DF), dateseq)), origin = "1970-01-01"))
2009-01-01 2009-01-02 2009-01-03 2009-01-04 2009-01-05 2009-01-06 2009-01-07
1 2 3 3 2 1 1
2009-01-08 2009-01-09
1 1
On Mon, Feb 9, 2009 at 10:57 AM, <stefan.peters...@inizio.se> wrote:
>
> hi,
>
> I have some session data in a dataframe, where each session is recorded with
> a start and a stop date. Like this:
>
> session_start session_stop
> ===================
> 2009-01-03 2009-01-04
> 2009-01-01 2009-01-05
> 2009-01-02 2009-01-09
>
> A session is at least one day long. Now I want a dataframe with 'active
> sessions' per date. Like this:
>
> date active_sessions
> =============
> 2009-01-01 1
> 2009-01-02 2
> 2009-01-03 3
> 2009-01-04 3
> 2009-01-05 2
> 2009-01-06 1
> 2009-01-07 1
> 2009-01-08 1
> 2009-01-09 1
>
> How do I do that? I've searched the usual sources, but my newbie status and
> language barrier left me with nothing. So plz, anyone?
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
