round Date object to 10 minutes intervals?

Dear Mr. Ripley,

your answer perfectly fits my needs, thank you very much.
(And yes, rounding 5 to even is what I wanted).


Prof Brian Ripley wrote

t2 <- strptime(timeStamp, format="%d.%m.%Y %H:%M")
t2$min <- round(t2$min, -1)

format(t2, "%d.%m.%Y %H:%M")

[1] "31.03.2011 09:30" "31.03.2011 09:40" "31.03.2011 10:00" "31.03.2011
10:10"
[5] "31.03.2011 10:30" "31.03.2011 10:40" "31.03.2011 10:50" "01.04.2011
00:00"

Prof Brian Ripley wrote

 
t2$min <- 10*floor((t2$min + 5)/10)
t2$min <- 10*floor((t2$min + 4)/10)

This really got me thinking and as a result increased my understanding of
maths & R ,
a big thanks to you  



--
View this message in context: http://r.789695.n4.nabble.com/round-Date-object-to-10-minutes-intervals-tp4185496p4185776.html
Sent from the R help mailing list archive at Nabble.com.