relations (version 0.6-9)

domain: Relation Domain, Arity, and Size

Description

Determine the domain, domain names, arity, or size of a relation or a relation ensemble.

Usage

relation_arity(x)
relation_domain(x)
relation_domain_names(x)
relation_size(x)

Arguments

x

an R object inheriting from class relation or relation_ensemble.

Value

For determining the domain, an object of class relation_domain, inheriting from tuple.

See Also

tuple(); relation(); relation_domain<-() and relation_domain_names<-() for modifying the domain and domain names of a relation, respectively.

Examples

# NOT RUN {
## A simple relation:
R <- as.relation(c(A = 1, B = 2, C = 3))
relation_incidence(R)
relation_arity(R)
relation_domain(R)
relation_domain_names(R)
relation_size(R)
# }