Query vertex attributes of a graph

Query vertex attributes of a graph

Usage

vertex_attr(graph, name, index = V(graph))

Arguments

graph

The graph.

name

Name of the attribute to query. If missing, then all vertex attributes are returned in a list.

index

An optional vertex sequence to query the attribute only for these vertices.

Value

The value of the vertex attribute, or the list of all vertex attributes, if name is missing.

See also

Vertex, edge and graph attributes delete_edge_attr(), delete_graph_attr(), delete_vertex_attr(), edge_attr(), edge_attr<-(), edge_attr_names(), graph_attr(), graph_attr<-(), graph_attr_names(), igraph-attribute-combination, igraph-dollar, igraph-vs-attributes, set_edge_attr(), set_graph_attr(), set_vertex_attr(), set_vertex_attrs(), vertex_attr<-(), vertex_attr_names()

Examples

g <- make_ring(10) %>%
  set_vertex_attr("color", value = "red") %>%
  set_vertex_attr("label", value = letters[1:10])
vertex_attr(g, "label")
#>  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j"
vertex_attr(g)
#> $color
#>  [1] "red" "red" "red" "red" "red" "red" "red" "red" "red" "red"
#> 
#> $label
#>  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j"
#> 
plot(g)