[Rd] names drop for columns from data.frame (PR#14002)

[veraf at clemson.edu]

Full_Name: Francisco Vera
Version: 2.9.2
OS: Windows
Submission from: (NULL) (74.248.242.164)


Run the following commands:

a<-data.frame(x=1:2,y=3:4,row.names=c("i","j"))
names(a$x)
names(a[,1])

For names(a$x) I get NULL instead of c("i","j"). Same thing happens with
names(a[,1]). It works fine for rows, i.e., names(a[1,]) gives what is supposed
to.

It also works fine for matrices. If you issue the commands
b<-matrix(1:4,ncol=2,dimnames=list(c("x","y"),c("i","j")))
names(b[,1])
names(b[1,])

Thanks