numeric {base} | R Documentation |
numeric
creates a real vector of the specified length. The
elements of the vector are all equal to 0
.
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.
numeric(length = 0) as.numeric(x) is.numeric(x)
R has no single precision data type. All real numbers are stored in double precision format.
as.numeric
for factors yields the codes underlying the factor
levels.
as.numeric(c("-.1"," 2.7 ","B")) # (-0.1, 2.7, NA) + warning as.numeric(factor(5:10))