inaccuracy in man page for duplicated() + anyDuplicated() not working with MARGIN=0
Hi, In man page for duplicated:
Value:
?duplicated()?: For a vector input, a logical vector of the same
length as ?x?. For a data frame, a logical vector with one
element for each row. For a matrix or array, a logical array with
the same dimensions and dimnames.
When 'x' is a matrix or array, the returned value is NOT a logical array:
> m <- matrix(c(3,2,7,6,2,7), nrow=3) > m
[,1] [,2] [1,] 3 6 [2,] 2 2 [3,] 7 7
> duplicated(m)
[1] FALSE FALSE FALSE
Only if MARGIN=0 it seems:
> duplicated(m, MARGIN=0)
[,1] [,2] [1,] FALSE FALSE [2,] FALSE TRUE [3,] FALSE TRUE
Indeed. Thank you for pointing this out. I'll definitely fix that part of the help file.
Also, any reason why this doesn't work?
> anyDuplicated(m, MARGIN=0)
Error in dim(newX) <- c(prod(d.call), d2) :
dims [product 1] do not match the length of object [6]
well, because the R core colleague enhanced duplicated.array() to work with MARGIN 0 (and similar cases) did not update the parallel code in anyDuplicated.array() correspondingly.
May be it could be equivalent to:
> anyDuplicated(as.vector(m))
[1] 5
Yes, that's what will happen after I've committed my fixes. Thank you very much, Herv?! Martin [...]
-- Herv? Pag?s
[...] (*) having authored anyDuplicated()