Thanks David! I will pay attention to the format later. This is not
homework exercise, I am just providing a mimic sample of my actual data and
as I described in the original post, this is 1min data so the time interval
is 1 min.


On Wed, Jun 12, 2013 at 6:20 PM, David Winsemius <dwinsemius@comcast.net>wrote:

>
> On Jun 12, 2013, at 5:55 PM, Ye Lin wrote:
>
> > Hey I want to identify data points by criteria, here is an example of my
> > 1min data
> >
> > Time     Var1      Var2
> > 00:00    1              0
> > 00:01    0              0
> > 00:02    1              0
> > 00:03    1              0
> > 00:04    0              0
> > 00:05    1              0
> > 00:06    1              0
> > 00:07    1              0
> > 00:08    1              0
> > 00:09    0              0
> > 00:10    1              0
> > 00:11    1              0
> > 00:12    1              0
> > 00:13    0              0
> >
> > I want to identify the data points where Var1=0 and Var2=0, ( in this
> > example shud be the points highlighted above), then calculate the time
> > duration between these data points, (in this example, shud be 3min, 5 min
> > and 4min), then identify the starting point of the max time duration ( in
> > this example shud be the starting point of 5-min-duration, return the
> data
> > points at 00:09), finally return the value in "Time" column ( in this
> > example shud be "00:09")
> >
>
> While you are waiting for an answer you might want to read the Posting
> Guide:
>
> http://www.R-project.org/posting-guide.html
>
> Points to pay special attention to: Plain-text. Posting code. Posting
> examples in form that can be pasted into console session (dump or dput
> functions). Providing context for problem (such as describing the
> conventions for your time-scale)  and your background (since this looks
> like a homework exercise.)
>
>
>
> > Thanks for your help!
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
>
>
> David Winsemius
> Alameda, CA, USA
>
>

	[[alternative HTML version deleted]]

