DiagrammeR (version 0.8.2)

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 that is created using create_graph.

edge_df

an edge data frame that is created using create_edges.

Value

a graph object of class dgr_graph.

Examples

## Not run: 
# # Create a graph with nodes and no edges
# nodes <-
#   create_nodes(nodes = c("a", "b", "c", "d"),
#                type = "letter",
#                color = c("red", "green", "grey", "blue"),
#                value = c(3.5, 2.6, 9.4, 2.7))
# 
# graph <- create_graph(nodes_df = nodes)
# 
# # Create an edge data frame
# edges <-
#   create_edges(from = c("a", "b", "c"),
#                to = c("d", "c", "a"),
#                rel = "leading_to")
# 
# # Add the edge data frame to the graph object to create a
# # graph with both nodes and edges
# graph <-
#   add_edge_df(graph = graph, edge_df = edges)
# 
# get_edges(graph, return_type = "vector")
# #> [1] "a -> d" "b -> c" "c -> a"
# ## End(Not run)