get_unique_edges: Get Unique Edges from an Edge List

In pagerankr: Modular Toolkit for PageRank Calculation

Get Unique Edges from an Edge List

Description

Removes duplicate edge rows from an edge list data frame and provides control over how self-loops (e.g., a -> a) are handled.

Usage

get_unique_edges(
  edge_list_df,
  self_loops = c("drop", "keep"),
  from_col = "from",
  to_col = "to"
)

Arguments

edge_list_df	A data frame representing the edge list, typically with columns "from" and "to" (or as specified by 'from_col', 'to_col').
self_loops	A character string specifying how to handle self-loops. Must be one of "drop" (default) or "keep".
from_col	Name of the source node column in 'edge_list_df'. Default "from".
to_col	Name of the target node column in 'edge_list_df'. Default "to".

Details

Any edge where either from or to is NA is automatically dropped before deduplication and self-loop handling.

Value

A data frame with unique edges, with self-loops handled according to the 'self_loops' argument. The from/to columns are coerced to character; all other columns in the input are preserved (first occurrence kept on dedup). If input columns are factors, they are converted to characters in the output.

Examples

edges <- data.frame(
  from = c("A", "B", "A", "C", "D"),
  to = c("B", "C", "B", "C", "D")
)
get_unique_edges(edges, self_loops = "drop")
get_unique_edges(edges, self_loops = "keep")

# With custom column names
edges_custom <- data.frame(
  source = c("X", "Y", "X"),
  target = c("Y", "Y", "Y")
)
get_unique_edges(edges_custom, from_col = "source", to_col = "target")

# With NAs (NAs are preserved as they are,
# duplicates involving NAs are also removed)
edges_na <- data.frame(
  from = c("A", NA, "A", "B", NA),
  to = c("B", "C", "B", "D", "C")
)
get_unique_edges(edges_na, self_loops = "keep")
# No self-loops with NA to drop
get_unique_edges(edges_na, self_loops = "drop")

pagerankr documentation built on Oct. 1, 2026, 5:09 p.m.