Extract or replace the contents of a slot in a object with a formal (S4) class structure.
An object from a formally defined (S4) class.
The character-string name of the slot, quoted or
not. Must be the name of a slot in the definition of the class
A replacement value for the slot, which must be from a
class compatible with the class defined for this slot in the
definition of the class of
These operators support the formal classes of package methods,
and are enabled only when package methods is loaded (as per
slot for further details, in particular
for the differences between
slot() and the
It is checked that
object is an S4 object (see
isS4), and it is an error to attempt to use
any other object. (There is an exception for name
internal use only.) The replacement operator checks that the slot
already exists on the object (which it should if the object is really
from the class it claims to be).
These are internal generic operators: see InternalMethods.
The current contents of the slot.
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