The $ operator is a syntactic sugar to query and set the
attributes of the vertices in a vertex sequence.
# S3 method for igraph.vs
[[(x, i) <- value# S3 method for igraph.vs
[(x, i) <- value
# S3 method for igraph.vs
$(x, name)
# S3 method for igraph.vs
$(x, name) <- value
V(x) <- value
A vertex sequence. For V<- it is a graph.
Index.
New value of the attribute, for the vertices in the vertex sequence.
Name of the vertex attribute to query or set.
A vector or list, containing the values of
attribute name for the vertices in the vertex sequence.
For numeric, character or logical attributes, it is a vector of the
appropriate type, otherwise it is a list.
The query form of $ is a shortcut for
vertex_attr, e.g. V(g)[idx]$attr is equivalent
to vertex_attr(g, attr, V(g)[idx]).
The assignment form of $ is a shortcut for
set_vertex_attr, e.g. V(g)[idx]$attr <- value is
equivalent to g <- set_vertex_attr(g, attr, V(g)[idx], value).
Other vertex and edge sequences:
E(),
V(),
igraph-es-attributes,
igraph-es-indexing2,
igraph-es-indexing,
igraph-vs-indexing2,
igraph-vs-indexing,
print.igraph.es(),
print.igraph.vs()
Other graph attributes:
delete_edge_attr(),
delete_graph_attr(),
delete_vertex_attr(),
edge_attr<-(),
edge_attr_names(),
edge_attr(),
graph_attr<-(),
graph_attr_names(),
graph_attr(),
igraph-dollar,
set_edge_attr(),
set_graph_attr(),
set_vertex_attr(),
vertex_attr<-(),
vertex_attr_names(),
vertex_attr()
# NOT RUN {
g <- make_(ring(10),
with_vertex_(
name = LETTERS[1:10],
color = sample(1:2, 10, replace=TRUE)
)
)
V(g)$name
V(g)$color
V(g)$frame.color <- V(g)$color
# color vertices of the largest component
largest_comp <- function(graph) {
cl <- components(graph)
V(graph)[which.max(cl$csize) == cl$membership]
}
g <- sample_(gnp(100, 2/100),
with_vertex_(size = 3, label = ""),
with_graph_(layout = layout_with_fr)
)
giant_v <- largest_comp(g)
V(g)$color <- "blue"
V(g)[giant_v]$color <- "orange"
plot(g)
# }
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