On May 2, 2010, at 3:27 PM, Mohan L wrote:
>as.numeric(assame$Login) //convert to numerics
NOOOOooooooo. You did not do what what I suggested earlier. Do not
reach for your keyboard in the R console until you have read the FAQ
section regarding converting factors to numeric. If you don't want
to read the FAQ
Hi David,
Now I understand the trick :
as.numeric(as.character(Login))
> avglog <-
with(assame,tapply(as.numeric(as.character(Login)),stdate,mean))> >
avglog
01/11/09 00:00 02/11/09 00:00 04/11/09 00:00 05/11/09 00:00 06/11/09
00:00
22.04866 16.65358 15.84970 16.58600
16.20743
07/11/09 00:00
18.52379
But still it will not work :
> avglog <- with(assame,tapply(as.numeric(levels(Login)
[as.integer(Login)]),stdate,mean))
Sometimes using with(. , .) does not work when the variable name is
buried deep in a nested set of functions. Furthermore mean needs an
na.rm argument if, as I suspect, you now have some some NA's in the
new variable. What happens when you:
assame$Login.num <- as.numeric(as.character(assame$Login))
avglog <- with(assame, tapply(Login2, stdate, mean, na.rm=TRUE) )
avglog
Untested of course since we STILL have no reproducible example. Had
you used dput on head(sample, 40) or head(sample2, 40) or head(assame,
40) we would not still be here guessing at what you really are working
with.
--
David.
Error in tapply(as.numeric(levels(Login)[as.integer(Login)]),
stdate, :
arguments must have same length
Thanks & Rg
Mohan L
David Winsemius, MD
West Hartford, CT
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