| setters {relations} | R Documentation |
Modify relations by (re)setting their domain, graph, or incidences.
relation_domain(x) <- value relation_domain_names(x) <- value relation_graph(x) <- value relation_incidence(x) <- value
x |
an R object inheriting from class relation. |
value |
for setting the domain, a tuple (or list) as long as the
arity of the relation x, with sets of cardinality (for lists:
numbers of elements) identical to the size of x.
For setting the graph, either a set of tuples of equal lengths (arity of the relation) or a data frame or something coercible to this, with the values of the components of the given tuples (rows) always elements of the corresponding elements of the domain of x.
For setting incidences, a binary array with dimension the size of the relation x.
For setting the domain names, a character vector as long as the arity of the relation x.
|
relation_domain for getting the domain of a relation;
relation_domain_names for getting the domain names;
relation_graph for getting the graph;
relation_incidence for getting the incidences;
relation for basic information.
R <- as.relation(1 : 3)
print(R)
relation_domain(R)
## tuple format:
relation_domain(R) <- pair(X = set("a","b","c"), Y = set("A","B","C"))
relation_domain(R)
## the same in list format:
relation_domain(R) <- list(X = letters[1:3], Y = LETTERS[1:3])
relation_domain(R)
relation_domain_names(R) <- c("XX","YY")
relation_domain_names(R)
relation_incidence(R)
relation_incidence(R) <- diag(1, 3, 3)
relation_incidence(R)
relation_graph(R)
## set format:
relation_graph(R) <- set(pair("a","B"), pair("a","C"), pair("b","C"))
relation_graph(R)
## the same in data frame format:
relation_graph(R) <- data.frame(c("a", "a", "b"), c("B", "C", "C"))
relation_graph(R)