is.object {base} | R Documentation |
A function rather for internal use. It returns TRUE
if the
object x
has the R internal OBJECT
bit set, and
FALSE
otherwise. The OBJECT
bit is set when a
"class"
attribute is added and removed when that attribute is
removed, so this is a very efficient way to check if an object has a
class attribute. (S4 objects always should.)
is.object(x)
x |
object to be tested. |
class
, and methods
.
isS4
.
is.object(1) # FALSE
is.object(as.factor(1:3)) # TRUE