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2004 Jun 16
3
Aggregating on Water Year Rather Than Calendar Year
...ich is in the usual format
"1991-10-07 10:35:00"
changed it by:
w$d<-as.POSIXct(w$date.time)
Now I can add an offset of 92 days
w$w.year<-as.POSIXct(w$d+7948800)
and have the years correspond to the "water year."
Now I wish to obtain some means by something like:
waterT<-aggregate(w$value[w$param.name=="Temperature"],
list(w$w.year[w$param.name=="Temperature"]),mean)
Except that I need to work on the year and being a neophyte in date
arithmetic I'm not finding a working method.
TIA
Clint
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Clint Bowman INTERNET: clint at ecy.wa....