Hi,
I don't believe the problem is related to tapply. I would say it is
because of the factor. In fact, the order of a factor is given by the
alphanumerical order of his levels. You can see it with levels(myfactor).
I you want to change the order, redefine the levels of myfactor with the
expected order or use the function ordered.
Alain
Chirantan Kundu wrote:
Hi,
Does tapply change the order when applied on a factor? Below is the code I
tried.
mylevels<-c("IN0020020155","IN0019800021","IN0020020064")
mydata<-c("IN0020020155","IN0019800021","IN0020020064","IN0020020155","IN0019800021","IN0019800021","IN0020020064","IN0020020064","IN0019800021")
myfactor<-factor(mydata,levels=mylevels)
myfactor
[1] IN0020020155 IN0019800021 IN0020020064 IN0020020155 IN0019800021
IN0019800021 IN0020020064 IN0020020064 IN0019800021
Levels: IN0020020155 IN0019800021 IN0020020064
summary(myfactor)
IN0020020155 IN0019800021 IN0020020064
2 4 3
# Everything fine upto this point. The order of levels is maintained as it
is.
mysummary<-tapply(myfactor,mydata,length)
mysummary
IN0019800021 IN0020020064 IN0020020155
4 3 2
# Now the order has changed.
Is this the expected behavior? Any idea on how to avoid the change in order?
Regards,
Chirantan
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