Get and set vertex and edge attributes — Vattr • igraphlite

Attributes can be set and retrieved in several ways:

with the name argument: Vattr(g, "name") = letters[1:6]
with the $ operator: Vattr(g)$name = letters[1:6]
with the [[ operator: Vattr(g)[["name"]] = letters[1:6]
direct operation with a data.frame: Vattr(g) = data.frame(name = letters[1:6])

Using the name argument for setting and $ operator for getting is the most efficient way according to the brief benchmarking.

Usage

Vattr(graph, name)

Vattr(graph, name) <- value

Eattr(graph, name)

Eattr(graph, name) <- value

V(graph)

E(graph)

Arguments

graph: An igraph_ptr object.
name: Name of the attribute to query or set. If missing, all the attributes are returned or replaced.
value: A vector or data.frame.

Value

Vattr() and Eattr() return a data.frame with the same number of rows as the number of vertices and edges in the graph, respectively.

V() and E() return an integer vector of vertex and edge IDs, respectively.

See also

Vnames() for specialized function for "name" attribute.

Examples

g = graph_create(letters[1:6])
Vattr(g)
#> # A tibble: 6 × 1
#>   name 
#>   <chr>
#> 1 a    
#> 2 b    
#> 3 c    
#> 4 d    
#> 5 e    
#> 6 f    
Eattr(g, "weight") = seq_len(ecount(g))
Eattr(g)
#> # A tibble: 3 × 1
#>   weight
#>    <int>
#> 1      1
#> 2      2
#> 3      3
V(g)
#> [1] 1 2 3 4 5 6
E(g)
#> [1] 1 2 3