Hi Jim,
Thanks a lot! It works now. I didn't remember how to access the
datetimes in w10min. names(...) is the solution!
Rolf
Jim Lemon wrote:
Hi Rolf,
If I get the above, perhaps if you change the names of w10min after
applying the calculation:
raindata<-data.frame(value=round(runif(60,0,4),1),
ptime=paste("2016-01-17 ","15:",0:59,sep=""))
t10min <- 600*floor(as.integer(as.POSIXct(raindata$ptime))/600)
w10min <- tapply(raindata$value,t10min,sum)
names(w10min)<-format(as.POSIXct(as.numeric(names(w10min)),
tz="AEST",origin="1970-01-01"),"%m/%d/%Y %H:%M")
Jim
On Sun, Jan 17, 2016 at 5:45 AM, Rolf Fankhauser
mailto:rolf.fankhau...@gepdata.ch>> wrote:
Hi
I would like to aggregate a rainfall series with 1min records
(timestamp and value of 0.1mm from a tipping bucket raingauge) to
10min values by summing up the values.
# ptime is a POSIXlt datetime value with tz="GMT"
t10min <- 600*floor(as.integer(as.POSIXct(data$ptime))/600)
w10min <- tapply(data$value, format(as.POSIXct(t10min, tz="GMT",
origin = "1970-01-01"), "%Y-%m-%d %H:%M"), sum)
write.table(as.matrix(w10min),"data 10min.txt", row.names=TRUE,
col.names=FALSE, quote=FALSE)
This code works but I would like to have the result in datetime
format of %m/%d/%Y %H:%M. When I output this format the records
are not chronologically sorted but text-sorted because dimnames of
w10min is of type character (because of the format function).
Is there an easier way summing up the records to 10min records?
Thanks,
Rolf
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