delete_edge | R Documentation |
From a graph object of class dgr_graph
, delete an existing edge by
specifying either: (1) a pair of node IDs corresponding to the edge (keeping
into consideration the direction of the edge in a directed graph), or (2) an
edge ID.
delete_edge(graph, from = NULL, to = NULL, id = NULL)
graph |
A graph object of class |
from |
a node ID from which the edge to be removed is outgoing. If an
edge ID is provided to |
to |
a node ID to which the edge to be removed is incoming. If an edge
ID is provided to |
id |
an edge ID of the edge to be removed. |
A graph object of class dgr_graph
.
Other edge creation and removal:
add_edge()
,
add_edge_clone()
,
add_edge_df()
,
add_edges_from_table()
,
add_edges_w_string()
,
add_forward_edges_ws()
,
add_reverse_edges_ws()
,
copy_edge_attrs()
,
create_edge_df()
,
delete_edges_ws()
,
delete_loop_edges_ws()
,
drop_edge_attrs()
,
edge_data()
,
join_edge_attrs()
,
mutate_edge_attrs()
,
mutate_edge_attrs_ws()
,
recode_edge_attrs()
,
rename_edge_attrs()
,
rescale_edge_attrs()
,
rev_edge_dir()
,
rev_edge_dir_ws()
,
set_edge_attr_to_display()
,
set_edge_attrs()
,
set_edge_attrs_ws()
# Create a graph with 2 nodes
graph <-
create_graph() %>%
add_n_nodes(n = 2)
# Add an edge
graph <-
graph %>%
add_edge(
from = 1,
to = 2)
# Delete the edge
graph <-
graph %>%
delete_edge(
from = 1,
to = 2)
# Get the count of edges in the graph
graph %>% count_edges()
# Create an undirected graph with
# 2 nodes and an edge
graph_undirected <-
create_graph(directed = FALSE) %>%
add_n_nodes(n = 2) %>%
add_edge(
from = 1,
to = 2)
# Delete the edge; the order of node ID
# values provided in `from` and `to`
# don't matter for the undirected case
graph_undirected %>%
delete_edge(
from = 2,
to = 1) %>%
count_edges()
# The undirected graph has a single
# edge with ID `1`; it can be
# deleted by specifying `id`
graph_undirected %>%
delete_edge(id = 1) %>%
count_edges()
# Create a directed graph with 2
# labeled nodes and an edge
graph_labeled_nodes <-
create_graph() %>%
add_n_nodes(
n = 2,
label = c("one", "two")) %>%
add_edge(
from = "one",
to = "two")
# Delete the edge using the node
# labels in `from` and `to`; this
# is analogous to creating the
# edge using node labels
graph_labeled_nodes %>%
delete_edge(
from = "one",
to = "two") %>%
count_edges()
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