Dear R experts,
I am sorry for sending this email again. I would
imagine yesterday and maybe today, have been very busy
days with the release of R v 2.7.0. I join all the R
users who are very gratful for your contant work and
efforts, specially knowing that you are doing this for
the sake of
Hi Judith,
Could you provide a copy of your data as well? (Either as a csv file,
or by copying and pasting the output of dput(my.data.frame) or by
generating a data.frame of random numbers with the same structure as
your data). That will help people to see what your code does and
suggest
After talking about it, I forgot to put the drop=TRUE in the 'split' call:
x.index - split(seq(nrow(dat)), dat[,c(tx,day)], drop=TRUE)
results - lapply(x.index, function(.indx){
mn - mean(dat$k[.indx])
..
data.frame()
})
On Tue, Apr 22, 2008 at 1:30 PM, Judith Flores [EMAIL
One of the things that is probably happening is that the 'by' is
producing all possible combinations and in some cases 'x' is size
zero. Put a check in the function within the 'by' to check for this
condition and just return a NULL.
Another approach that I use is to split(seq(nrow(df),
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