Convert igraph objects to and from other formats.

Round-trip conversion is not guaranteed currently. Conversion to data.frame preserves edge attributes and vertex names, but the other vertex attributes are lost, and internal vertex IDs may change.

Usage

as_igraph(x, ...)

# Default S3 method
as_igraph(x, ...)

# S3 method for class 'matrix'
as_igraph(x, ...)

# S3 method for class 'data.frame'
as_igraph(x, ...)

# S3 method for class 'igraph_ptr'
as.data.frame(x, ...)

# S3 method for class 'igraph_ptr'
as.matrix(x, ...)

Arguments

x

A vector, matrix, data.frame, or graph object to be converted.

...

Additional arguments passed to the conversion function.

Value

as_igraph() returns an igraph_ptr object.

as.data.frame() returns an edge list in data.frame format, which may include additional columns for edge attributes.

as.matrix() returns an edge list in matrix format.

See also

graph_from_symbolic_edgelist(), graph_from_edgelist(), graph_from_data_frame(), graph_create() for underlying functions.

Examples

edges = seq_len(6L)
g1 = as_igraph(edges)
edgelist = as.matrix(g1) |> print()
#>      [,1] [,2]
#> [1,]    1    2
#> [2,]    3    4
#> [3,]    5    6

g2 = as_igraph(edgelist)
g3 = as_igraph(as.data.frame(g2)) |> print()
#> $V  tibble [6 × 1] (S3: tbl_df/tbl/data.frame)
#>  $ name: int [1:6] 1 2 3 4 5 6
#> # A tibble: 3 × 2
#>    from    to
#>   <int> <int>
#> 1     1     2
#> 2     3     4
#> 3     5     6