inherits
Test Inheritance of an Object
Description
Returns a logical value or an integer vector indicating from which classes
x inherits.
Usage
inherits(x, what, which = FALSE)
Arguments
| x |
any object, possibly but not necessarily having a class attribute.
|
| what |
a character vector of possible classes.
|
| which |
logical flag: if TRUE, specify which classes matched the object; if FALSE,
just say whether any classes matched the object.
|
Value
if which is FALSE, a single logical value. The value is TRUE if any
of the classes in the class
attribute of x match (exactly) any of the strings in what.
if which is TRUE, an integer vector of the same length as what
that contains the position in the class of x that each value in what
matches.
A zero is returned for elements of what that dont match any element of the
class.
See Also
Examples
# the definition of as.factor
function(x) if(inherits(x,"factor")) x else factor(x)
inherits(y~x, c("formula", "terms"))