On 11/09/12 09:47, I wrote:
I like comments, but [.data.table drops them, e.g.
More specifically, it drops them for the 'outer' data.table but not the
inner (!?) when doing the join:
DT1 <- data.table(id = seq.int(1, 10), A = LETTERS[1:10], key = "id")
comment(DT1$A) <- "A"
DT2 <- data.table(id = seq.int(2, 10, 2), b = letters[1:5], key = "id")
comment(DT2$b) <- "b"
str(DT1[DT2]) # No comment on A
str(DT2[DT1]) # No comment on b
Allan
PS: is stopifnot(identical(DT1[DT1]$A, DT1[DT1]$A.1)) a buglet?
DT1 <- data.table(A = 1:10)
comment(DT1$A) <- "Documenting A column"
DT2 <- DT1[A %% 2]
stopifnot(identical(comment(DT1$A), comment(DT2$A)))
Is there any way of preserving the comments? (My normal use case is
DT1 <- DT1[...] so copying from one to the other is a little ...
tedious?)
Allan
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