Multiple networks from a single edgelist with a typed attribute — graph_from_multi

Create a list of igraph objects from an edgelist according to a type attribute

Usage

graph_from_multi_edgelist(
  d,
  from = NULL,
  to = NULL,
  type = NULL,
  weight = NULL,
  directed = FALSE
)

Arguments

d: data frame.
from: column name of sender. If NULL, defaults to first column.
to: column of receiver. If NULL, defaults to second column.
type: type attribute to split the edgelist. If NULL, defaults to third column.
weight: optional column name of edge weights. The column is stored as edge attribute weight. Ignored if NULL.
directed: logical scalar, whether or not to create a directed graph.

Value

list of igraph objects.

Author

David Schoch

Examples

library(igraph)
d <- data.frame(
    from = rep(c(1, 2, 3), 3), to = rep(c(2, 3, 1), 3),
    type = rep(c("a", "b", "c"), each = 3), weight = 1:9
)
graph_from_multi_edgelist(d, "from", "to", "type", "weight")
#> $a
#> IGRAPH 4774d7a UNW- 3 3 -- 
#> + attr: name (v/c), weight (e/n), type (e/c)
#> + edges from 4774d7a (vertex names):
#> [1] 1--2 2--3 1--3
#> 
#> $b
#> IGRAPH 5011380 UNW- 3 3 -- 
#> + attr: name (v/c), weight (e/n), type (e/c)
#> + edges from 5011380 (vertex names):
#> [1] 1--2 2--3 1--3
#> 
#> $c
#> IGRAPH c91d74b UNW- 3 3 -- 
#> + attr: name (v/c), weight (e/n), type (e/c)
#> + edges from c91d74b (vertex names):
#> [1] 1--2 2--3 1--3
#>