igraph-vs-attributes
Query or set attributes of the vertices in a vertex sequence
The $ operator is a syntactic sugar to query and set the
attributes of the vertices in a vertex sequence.
Usage
# 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
Arguments
- x
A vertex sequence. For
V<-it is a graph.- i
Index.
- value
New value of the attribute, for the vertices in the vertex sequence.
- name
Name of the vertex attribute to query or set.
Details
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).
Value
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.
See Also
Other graph attributes: $.igraph,
$<-.igraph, igraph-dollar,
igraph-dollar; attributes,
graph_attr_names,
list.graph.attributes;
delete_edge_attr,
remove.edge.attribute;
delete_graph_attr,
remove.graph.attribute;
delete_vertex_attr,
remove.vertex.attribute;
edge.attributes<-,
edge_attr<-; edge.attributes,
edge_attr,
get.edge.attribute;
edge_attr_names,
list.edge.attributes;
get.graph.attribute,
graph.attributes, graph_attr;
get.vertex.attribute,
vertex.attributes,
vertex_attr;
graph.attributes<-,
graph_attr<-;
list.vertex.attributes,
vertex_attr_names;
set.edge.attribute,
set_edge_attr;
set.graph.attribute,
set_graph_attr;
set.vertex.attribute,
set_vertex_attr;
vertex.attributes<-,
vertex_attr<-
Other vertex and edge sequences: $.igraph.es,
$<-.igraph.es, E<-,
[<-.igraph.es,
[[<-.igraph.es,
igraph-es-attributes,
igraph-es-attributes,
igraph-es-attributes,
igraph-es-attributes,
igraph-es-attributes; E;
V; [.igraph.es,
%--%, %->%,
%<-%, igraph-es-indexing;
[.igraph.vs,
igraph-vs-indexing;
[[.igraph.es,
igraph-es-indexing2;
[[.igraph.vs,
igraph-vs-indexing2;
print.igraph.es;
print.igraph.vs
Examples
# NOT RUN {
g <- make_(ring(10),
with_vertex_(
name = LETTERS[1:10],
color = sample(1:2, 10, replace=TRUE)
)
)
V(g)$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)
# }