arguments passed to other methods. Currently ignored.
as.list
a logical value indicating whether the poset should
be returned as list or as a matrix. Defaults to FALSE, which returns
a matrix
Value
When x contains a poset, either a matrix or a list
(when as.list is TRUE) with the indices that
make up the poset. If there's no poset, the function returns
a missing value.
The returned matrix hax 2 columns, each named after the
respective poset function. In case a list is requested, the function
returns a named list with 2 elements, each element containing the
indices related to the poset function of the same name
(either L or R).