relations (version 0.1-0)

classes: Relation Equivalence Classes

Description

Provide class ids for an equivalence relation, or the indifference relation of a weak order.

Usage

relation_class_ids(x)

Arguments

x

an object inheriting from class relation.

Value

• A numeric vector with class ids corresponding to the classes of the equivalence relation, or the indifference relation of the weak order with ids ordered according to increasing preference.

Examples

## Equivalence.
f <- factor(rep(c("Good", "Bad", "Ugly"), c(3, 2, 1)))
R <- as.relation(f)
relation_is_equivalence(R)
table(ids = relation_class_ids(R), orig = f)
## Weak order ("weak preference").
f <- as.ordered(f)
R <- as.relation(f)
relation_is_weak_order(R)
table(ids = relation_class_ids(R), orig = f)