Determine the incidences of a relation.
an object inheriting from class
Further arguments passed to the labeling function used for creating the dimnames of the incidence matrix.
For a k-ary relation, a k-dimensional numeric array with
values in the unit interval inheriting from class
relation_incidence whose elements give the memberships of the
corresponding k-tuples are contained in the relation (for a
crisp relation, a binary (0/1) array with elements indicating whether
the corresponding tuples are contained in the relation or not).
relation_incidence<- for modifying the incidences.
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