Transforms the edge list representation of a graph into an adjacency matrix

This helper is useful for generating the inputs for functions that expect preference graphs.

Usage

adjacency_from_edge_list(levels, allow = NULL, disallow = NULL)

Arguments

levels

The levels (and hence nodes) of the graph. This is needed since not all nodes neccesarily have an edge.

allow, disallow

List of vectors of length 2 representing the edges that should be included or excluded from the graph. Exactly one of allow or disallow must be passed.

Value

The adjacency matrix.

Author

Daan Koning

Examples

levels <- c("A", "B", "C", "D")
edges <- list(c("A", "C"), c("D", "B"))
# Include the pairings from `edges`:
adjacency_from_edge_list(levels, allow = edges)
#>   A B C D
#> A 0 0 1 0
#> B 0 0 0 1
#> C 1 0 0 0
#> D 0 1 0 0
# Or exclude them:
adjacency_from_edge_list(levels, disallow = edges)
#>   A B C D
#> A 1 1 0 1
#> B 1 1 1 0
#> C 0 1 1 1
#> D 1 0 1 1