Thanks Berend,
I don't know why I didn't try that before posting the question... but...
anyways, thanks for your help
Srecko
On Thu, Aug 29, 2013 at 11:34 AM, Berend Hasselman <b...@xs4all.nl> wrote:
>
> On 29-08-2013, at 20:15, srecko joksimovic <sreckojoksimo...@gmail.com>
> wrote:
>
> > Thanks Arun,
> >
> > this is great. However, it should be just a little bit different:
> >
> > # id event time time_on_task
> > #1 1 add 1373502892 80
> > #2 2 add 1373502972 23
> > #3 3 delete 1373502995 901
> > #4 4 view 1373503896 100
> > #5 5 add 1373503996 NA
> >
> > When I calculate difference, I need to know how long each activity was.
> It
> > is id2-id1 for the first activity...
>
> then why don't you try
>
> dat1$time_on_task<- c(diff(dat1$time),NA)
>
> Berend
>
>
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