vector(mode = "logical", length = 0) as.vector(x, mode = "any") is.vector(x, mode = "any")
vector produces a vector of the given length and mode. Logical
vector elements are initialized to FALSE, numeric vector
elements to 0 and character vector elements to "".
as.vector, a generic, attempts to coerce its argument into a
vector of mode mode (the default is to coerce to whichever mode
is most convenient). The attributes of x are removed.
is.vector returns TRUE if x is a vector (of mode
logical, factor, integer, real or character) and FALSE
otherwise.
c, is.numeric, is.list, etc.df <- data.frame(x=1:3, y=5:7) ## Error: as.vector(data.frame(x=1:3, y=5:7), mode="numeric") ###-- All the following are TRUE: is.list(df) ! is.vector(df) ! is.vector(df, mode="list") is.vector(list(), mode="list") is.vector(NULL, mode="NULL")