Convert Network Objects to New Type

Converts an input list of networks between various representations: matrix, dgCMatrix, edgelist, and igraph.

Usage

make_network_type(obj, input.type, output.type)

Arguments

obj

A list of network objects, which must match the input.type specified.

input.type

A character string specifying the input type of obj. Options include "igraph", "matrix", "dgCMatrix", or "edgelist".

output.type

A character string specifying the desired output type. Options are "igraph", "matrix", "dgCMatrix", or "edgelist".

Value

A converted list of network objects in the specified output.type format.

Details

The function converts each network in obj to the specified output.type. Conversion logic is applied based on input.type and output.type.

• If input.type and output.type are the same, obj is returned as is.

• Conversions from adjacency matrices to igraph objects are handled via igraph::graph_from_adjacency_matrix.

• Conversions from igraph objects to edge lists are handled with igraph::as_edgelist.

• Conversions from igraph objects to adjacency matrices are handled with igraph::as_adjacency_matrix.

Networks with \(n\) nodes can be represented as,

• "igraph": an igraph object

• "matrix": an \(n\)-by-\(n\) adjacency matrix, class "matrix"

• "dgCMatrix": an \(n\)-by-\(n\) adjacency matrix as a sparse matrix, class {dgCMatrix}, see Matrix package for details

• "edgelist": an \(\binom{n}{2}\)-by-2 matrix where each row is the pair of nodes an edge is attached to

To use "dgCMatrix" for input.type or output.type, the package Matrix must be installed.

See also

detect_type()

Examples

# Convert list of adjacency matrices to igraph objects
one_matrix <- matrix(c(0, 1, 1, 1, 0, 0, 1, 0, 0), nrow = 3, byrow = TRUE)
matrix_list <- replicate(3, one_matrix, simplify = FALSE)
igraph_list <-
  make_network_type(matrix_list,
                   input.type = "matrix",
                   output.type = "igraph")

# Same thing now using detect type
type <- detect_type(matrix_list)
type
#> [1] "matrix"
igraph_list <-
  make_network_type(matrix_list,
                   input.type = type,
                   output.type = "igraph")

# Convert list of igraph objects to sparse matrix
sparsematrix_list <-
  make_network_type(igraph_list,
                    input.type = "igraph",
                    output.type = "dgCMatrix")
detect_type(sparsematrix_list)
#> [1] "dgCMatrix"