2 messages · White.Denis@epamail.epa.gov, Douglas Bates
Is the difference in behavior below, introduced in 1.8, inconsistent or, at least, undesirable? I couldn't find this in the NEWS. On the one hand,
a <- matrix (1:4, nrow=2)
a <- data.frame (a)
names (a) <- c("break","next")
names (a)
[1] "break" "next" On the other,
a <- matrix (1:4, nrow=2)
dimnames(a) <- list (1:2, c("break","next"))
a <- data.frame (a)
names(a)
[1] "break." "next." thanks, Denis
White.Denis at epamail.epa.gov writes:
Is the difference in behavior below, introduced in 1.8, inconsistent or, at least, undesirable? I couldn't find this in the NEWS. On the one hand,
a <- matrix (1:4, nrow=2)
a <- data.frame (a)
names (a) <- c("break","next")
names (a)
[1] "break" "next" On the other,
a <- matrix (1:4, nrow=2)
dimnames(a) <- list (1:2, c("break","next"))
a <- data.frame (a)
names(a)
[1] "break." "next."
Works fine if you don't use keywords as column names
a <- matrix (1:4, nrow=2)
dimnames(a) <- list (1:2, c("foo","bar"))
b <- data.frame(a)
names(b)
[1] "foo" "bar" The difference in the result for your example has to do with an extra step in the second case to obtain a legitimate name that can be used with the $ operator. R generates a syntax error for a$break but not for a$break.