factor as seq() in for loop
Tord Snall <Tord.Snall at helsinki.fi> writes:
Dear all,
I would like to use the values in vegaggr.BLMCMR02$colony
str(vegaggr.BLMCMR02)
`data.frame': 1678 obs. of 3 variables:
$ vegtype : Factor w/ 27 levels "2010","2020",..: 3 4 5 19 4 5 19 5
$ colony : Factor w/ 406 levels "0","1","10","100",..: 1 1 1 1 2 2 2
$ Totvegproparea: num 0.00055 0.03956 0.95705 0.00284 0.05215 ...
as the seq in a for loop (for(var in seq)), and therefore first picked them
out as
cols = aggregate(list(A = vegaggr.BLMCMR02$Totvegproparea),
list(colony = vegaggr.BLMCMR02$colony), sum)[,1]
str(cols)
Factor w/ 406 levels "0","1","10","100",..: 1 2 3 4 5 6 7 8 9 10 ... I next planned to transform cols using as.integer(cols). However, this transformation gives a vector corresponding to seq(from=1,to=length(cols)).
Yes, it would do that... The construction looks a bit complicated, though. If you want the levels of the factor, wouldn't levels(vegaggr.BLMCMR02$colony) do it?
Could someone please give advice on how to make use of a factor as the seq in a for loop (which is strictly not allowed' according to ?Control).
You're not exactly being clear about what the for loop should achieve!
O__ ---- Peter Dalgaard ??ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907