gianni lavaredo schreef:
Thanks in advice for your time,
Sorry for this simple question I am searching a function or a method to
obtain the list of the ID. I tryed sever combination like manual or in R
wiki
mfDF <- data.frame(
ID =c(1,1,1,1,2,2,2,2,2,3,3,3,3,3,3,3,3),
value =c(2,12,25,50,100,200,6,12,50,25,50,50,6,8,90,5,8))
like this
1 2 3
Thanks and sorry
Gianni
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Hi,
Because ID is a categorical value, it is good to make it a factor (R
type for categories). Then it is also quite easy to get the levels:
mfDF <- data.frame(
ID =as.factor(c(1,1,1,1,2,2,2,2,2,3,3,3,3,3,3,3,3)),
value =c(2,12,25,50,100,200,6,12,50,25,50,50,6,8,90,5,8))
# Get a list of the possible ID's
levels(mfDF$ID)
cheers,
Paul
--
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: +3130 274 3113 Mon-Tue
Phone: +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul
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