numeric(n = 0) as.numeric(x) is.numeric(x)
numeric
creates a real vector of length n
. The vector
is filled with zeros.
as.numeric
attempts to coerce its argument to numeric type
(either integer or real).
is.numeric
returns TRUE
if its argument is of type real
or type integer and FALSE
otherwise.
as.numeric
for factors now operates on the levels of the factor, not
the underlying codes. Use codes
for the old behaviour
as.numeric(c("2","B")) as.numeric(factor(5:10))