# V

0th

Percentile

##### Vertices of a graph

Create a vertex sequence (vs) containing all vertices of a graph.

##### Usage
V(graph)
graph

The graph

##### Details

A vertex sequence is just what the name says it is: a sequence of vertices. Vertex sequences are usually used as igraph function arguments that refer to vertices of a graph.

A vertex sequence is tied to the graph it refers to: it really denoted the specific vertices of that graph, and cannot be used together with another graph.

At the implementation level, a vertex sequence is simply a vector containing numeric vertex ids, but it has a special class attribute which makes it possible to perform graph specific operations on it, like selecting a subset of the vertices based on graph structure, or vertex attributes.

A vertex sequence is most often created by the V() function. The result of this includes all vertices in increasing vertex id order. A vertex sequence can be indexed by a numeric vector, just like a regular R vector. See [.igraph.vs and additional links to other vertex sequence operations below.

##### Value

A vertex sequence containing all vertices, in the order of their numeric vertex ids.

##### Indexing vertex sequences

Vertex sequences mostly behave like regular vectors, but there are some additional indexing operations that are specific for them; e.g. selecting vertices based on graph structure, or based on vertex attributes. See [.igraph.vs for details.

##### Querying or setting attributes

Vertex sequences can be used to query or set attributes for the vertices in the sequence. See \$.igraph.vs for details.

Other vertex and edge sequences: E, igraph-es-attributes, igraph-es-indexing2, igraph-es-indexing, igraph-vs-attributes, igraph-vs-indexing2, igraph-vs-indexing, print.igraph.es, print.igraph.vs

• V
##### Examples
# NOT RUN {
# Vertex ids of an unnamed graph
g <- make_ring(10)
V(g)

# Vertex ids of a named graph
g2 <- make_ring(10) %>%
set_vertex_attr("name", value = letters[1:10])
V(g2)
# }

Documentation reproduced from package igraph, version 1.2.4.1, License: GPL (>= 2)

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