R: Extract or Replace A Slot

slotOp {base} | R Documentation

## Extract or Replace A Slot

### Description

Extract or replace the contents of a slot in a object with a formal (S4) class structure.

### Usage

    object@name
    object@name <- value

### Arguments

`object` | An object from a formally defined (S4) class.
`name` | The character-string name of the slot, quoted or not. Must be the name of a slot in the definition of the class of `object`.
`value` | 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 `object`.

### Details

These operators support the formal classes of package methods, and are enabled only when package methods is loaded (as per default). See `slot` for further details, in particular for the differences between `slot()` and the `@` operator.

It is checked that `object` is an S4 object (see `isS4`), and it is an error to attempt to use `@` on any other object. (There is an exception for name `.Data` for 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).

Prior to R 3.0.0 the replacement operator was in package methods and had a different test for validity of `name`.

These are internal generic operators: see InternalMethods.

### Value

The current contents of the slot.

### See Also

`Extract`, `slot`

[Package base version 3.1.2 Index]