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forysthe
2007 Dec 16
2
question about the aggregate function with respect to order of levels of grouping elements
...r" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
agg2=aggregate(df[,2],list(year=years(df[,1]),month=fmonth),sum)
levels(agg2$month) # even if a factor with levels in the correct order is
supplied, aggregate(), sortsthe levels by alphabet regardless.
[1] "Apr" "Aug" "Dec" "Feb" "Jan" "Jul" "Jun" "Mar" "May" "Nov" "Oct" "Sep"
--
Tom
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