[R] Dividing rows when time is overlapping

[PEL]

Hi all,

I have dataframe that was created from the fusion of two dataframes. Both
spanned over the same time intervall but contained different information.
When I put them together, the info overlapped since there is no holes in the
time interval of one of the dataframe. Here is an example where the rows
"sp=A and B" are part of a first df and the rows "sp=C" come from a second.
The first dataframe is continuous but the second consists of sporadic
events. The final dataframe looks like this: 

start                               end                                 sp
2010-06-01 17:00:00    2010-06-01 19:30:00         A
2010-06-01 19:30:01    2010-06-01 20:00:00         B
2010-06-01 19:45:00    2010-06-01 19:55:00         C
2010-06-01 20:00:01    2010-06-01 20:30:00         A
2010-06-01 20:05:00    2010-06-01 20:10:00         C
2010-06-01 20:12:00    2010-06-01 20:15:00         C
2010-06-01 20:30:01    2010-06-01 20:40:00         B
2010-06-01 20:35:00    2010-06-01 20:40:10         C
2010-06-01 20:40:01    2010-06-01 20:50:00         A

I would like to prioritize "C" so when it overlaps the time interval of
another "sp", the time interval of "A" or "B" is cut accordingly. As seen in
the example, I sometimes have multiple events of "C" that overlap a single
event of "A" or "B". The result would be this:

start                               end                                 sp
2010-06-01 17:00:00    2010-06-01 19:30:00         A
2010-06-01 19:30:01    2010-06-01 19:44:59         B
2010-06-01 19:45:00    2010-06-01 19:55:00         C
2010-06-01 19:55:01    2010-06-01 20:00:00         B
2010-06-01 20:00:01    2010-06-01 20:04:59         A
2010-06-01 20:05:00    2010-06-01 20:10:00         C
2010-06-01 20:10:01    2010-06-01 20:11:59         A
2010-06-01 20:12:00    2010-06-01 20:15:00         C
2010-06-01 20:15:01    2010-06-01 20:30:00         A
2010-06-01 20:30:01    2010-06-01 20:34:59         B
2010-06-01 20:35:00    2010-06-01 20:40:10         C
2010-06-01 20:40:11    2010-06-01 20:50:00         A

My date/time columns are in POSIXct. Don't hesitate to ask if something is
unclear.

Thanks in advance


--
View this message in context: http://r.789695.n4.nabble.com/Dividing-rows-when-time-is-overlapping-tp4170428p4170428.html
Sent from the R help mailing list archive at Nabble.com.