[R] Sum per hour

From: <jessica.gervais_at_tudor.lu>
Date: Thu, 24 May 2007 20:49:14 +0200

Dear all,

I have a list of precipitation record and a list of time I would like to sum them up per hour, or per day. Does such a function exist ?

example:

time<-c("2000-10-03 14:00:00","2000-10-03 14:10:00","2000-10-03
14:20:00","2000-10-03 15:30:00","2000-10-03 16:40:00","2000-10-03
16:50:00","2000-10-03 17:00:00","2000-10-03 17:10:00","2000-10-03
17:20:00","2000-10-03 18:30:00","2000-10-04 14:00:00","2000-10-04
14:10:00","2000-10-04 14:20:00","2000-10-04 15:30:00","2000-10-04
16:40:00","2000-10-04 16:50:00","2000-10-04 17:00:00","2000-10-04
17:10:00","2000-10-04 17:20:00","2000-10-04 18:30:00")

precipitation<-c(0,0.1,0,0,0,0,0.2,0.3,0.5,6,7,8,9,1,0,0,0,0,1,0)

DATA<-cbind(time,precipitation)

... ?
how to sum up per hour ?

Thanks in advance

Jessica



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