| 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. |
This is a primitive function.
isS4.
is.object(1) # FALSE is.object(as.factor(1:3)) # TRUE