[Rd] tapply on empty data.frames (PR#10644)
hilmar.berger at imise.uni-leipzig.de
hilmar.berger at imise.uni-leipzig.de
Sun Jan 27 23:10:04 CET 2008
Full_Name: Hilmar Berger
Version: 2.4.1/2.6.2alpha
OS: WinXP
Submission from: (NULL) (84.185.128.110)
Hi all,
If I use tapply on an empty data.frame I get an error. I'm not quite sure if one
can actually expect the function to return with a result. However, the error
message suggests that this case does not get handled well.
This happens both in R-2.4.1 and 2.6.2alpha (version 2008-01-26).
> z = data.frame(a = c(1,2,3,4),b=c("a","b","c","d"))
> z1 = subset(z,a == 5)
> tapply(z1$a,z1$b,length)
Error in ansmat[index] <- ans :
incompatible types (from NULL to logical) in subassignment type fix
Deleting unused factor levels from the group parameter gives:
> tapply(z1$a,factor(z1$b),length)
logical(0)
Regards,
Hilmar
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status alpha
major 2
minor 6.2
year 2008
month 01
day 26
svn rev 44181
language R
version.string R version 2.6.2 alpha (2008-01-26 r44181)
More information about the R-devel
mailing list