charfun: Relation Characteristic Functions

In relations: Data Structures and Algorithms for Relations

Relation Characteristic Functions

Description

Determine the characteristic function of a relation.

Usage

relation_charfun(x, components = FALSE)

Arguments

x	an object inheriting from class relation.
components	a logical indicating whether the characteristic function created should take vectors (each vector corresponding to one domain) as argument, or a data frame (with the elements in the rows). In the former case, all vectors are recycled to fit the longest vector in case of binary relations.

See Also

relation()

Examples

## Relation 'a divides b':
divides <- function(a, b) b %% a == 0
R <- relation(domain = list(1 : 10, 1 : 10), charfun = divides)
R
## 'Recover' characteristic function:
"%|%" <- relation_charfun(R)

## Use it.
2L %|% 6L
2:4 %|% 6L
2L %|% c(2:3, 6L)

## This also works:
"%|%"(2L, 6L)
## (and more generally does for arities > 2).

relations documentation built on April 3, 2025, 5:59 p.m.