DiagrammeR (version 0.9.2)

add_edge_df: Add edges from an edge data frame to an existing graph object

Description

With a graph object of class dgr_graph add edges from an edge data frame to that graph.

Usage

add_edge_df(graph, edge_df)

Arguments

graph

a graph object of class dgr_graph.

edge_df

an edge data frame that is created using create_edge_df.

Value

a graph object of class dgr_graph.

Examples

Run this code
# NOT RUN {
# Create a node data frame (ndf)
ndf <-
  create_node_df(
    n = 4,
    type = "letter",
    color = c("red", "green", "grey", "blue"),
    value = c(3.5, 2.6, 9.4, 2.7))

# Create a graph with nodes and no edges
graph <- create_graph(nodes_df = ndf)

# Create an edge data frame (edf)
edf <-
  create_edge_df(
    from = c(1, 2, 3),
    to = c(4, 3, 1),
    rel = "leading_to")

# Add the edge data frame to the graph object to
# create a graph with both nodes and edges
graph <-
  graph %>%
  add_edge_df(edf)

# Get the graph's edges to verify that the edge
# data frame had been added
get_edges(graph, return_type = "vector")
#> [1] "1->4" "2->3" "3->1"
# }

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