R: Query vertex attributes of a graph

vertex_attr {igraph} | R Documentation

## Query vertex attributes of a graph

### Description

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` | A 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

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`, `igraph-vs-attributes`, `set_edge_attr()`, `set_graph_attr()`, `set_vertex_attr()`, `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")
    vertex_attr(g)
    plot(g)

[Package igraph version 1.2.6 Index]